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所有论文

61. 题目: Review on biochar as a sustainable green resource for the rehabilitation of petroleum hydrocarbon-contaminated soil
文章编号: N24060906
期刊: Science of the Total Environment
作者: Kayeen Vadakkan, Kuppusamy Sathishkumar, Rini Raphael, Viji Ouseph Mapranathukaran, Jennees Mathew, Beena Jose
更新时间: 2024-06-09
摘要: Petroleum pollution is one of the primary threats to the environment and public health. Therefore, it is essential to create new strategies and enhance current ones. The process of biological reclamation, which utilizes a biological agent to eliminate harmful substances from polluted soil, has drawn much interest. Biochars are inexpensive, environmentally beneficial carbon compounds extensively employed to remove petroleum hydrocarbons from the environment. Biochar has demonstrated an excellent capability to remediate soil pollutants because of its abundant supply of the required raw materials, sustainability, affordability, high efficacy, substantial specific surface area, and desired physical-chemical surface characteristics.

62. 题目: Potential in treating arsenic-contaminated water of the biochars produced from hyperaccumulator Pteris vittata and its environmental safety
文章编号: N24060905
期刊: Environmental Pollution
作者: Yuluo Wang, Weibin Zeng, Xiaoming Wan, Mei Lei, Tongbin Chen
更新时间: 2024-06-09
摘要: In this study, biochar derived from pyrolyzed aboveground parts of () was modified with iron(Fe) and applied to aqueous solutions containing arsenite (As[III]) or arsenate (As[V]) for remediation purposes. The adsorption efficiency, biochar characteristics pre- and post-adsorption, microscopic As distribution, and As morphology were analyzed. Additionally, the potential and leaching safety of biochar for As-contaminated water remediation were evaluated. Results indicated that biochar contained oxygen-containing functional groups and aromatic structures. Modification with Fe increased specific surface area and total pore volume. Unmodified biochar displayed low adsorption of As(III) and As(V), while Fe modification significantly enhanced As adsorption capacity and reduced As leaching by 69%–89%. Maximum adsorption capacities of Fe-modified biochar for As(III) and As(V) were 7.64 and 10.2 mg/g, respectively, as determined by Langmuir fitting. The superior adsorption efficiency of As(V) over As(III) by Fe-modified biochar was attributed to better electrostatic interaction with the adsorbent. Analysis revealed similar As species in biochar before and after adsorption, with a significant presence of As(III). Remarkably, As in remained highly stable during pyrolysis and adsorption, possibly due to strong Fe–As binding. Fe-modified biochar shows promise for application, but further pretreatment may be necessary to achieve optimal results.

63. 题目: Unveiling biochar potential to promote safe crop production in toxic metal(loid) contaminated soil: A meta-analysis
文章编号: N24060904
期刊: Environmental Pollution
作者: Li Chen, Xing Yang, Fengyu Huang, Xiaozhen Zhu, Zhe Wang, Shiyong Sun, Faqin Dong, Tianyi Qiu, Yi Zeng, Linchuan Fang
更新时间: 2024-06-09
摘要: Biochar application emerges as a promising and sustainable solution for the remediation of soils contaminated with potentially toxic metal (loid)s (PTMs), yet its potential to reduce PTM accumulation in crops remains to be fully elucidated. In our study, a hierarchical meta-analysis based on 276 research articles was conducted to quantify the effects of biochar application on crop growth and PTM accumulation. Meanwhile, a machine learning approach was developed to identify the major contributing features. Our findings revealed that biochar application significantly enhanced crop growth, and reduced PTM concentrations in crop tissues, showing a decrease trend of grains (36.1%, 33.6–38.6%) > shoots (31.1%, 29.3–32.8%) > roots (27.5%, 25.7–29.2%). Furthermore, biochar modifications were found to amplify its remediation potential in PTM-contaminated soils. Biochar application was observed to provide favorable conditions for reducing PTM uptake by crops, primarily through decreasing available PTM concentrations and improving overall soil quality. Employing machine learning techniques, we identified biochar properties, such as surface area and C content as a key factor in decreasing PTM bioavailability in soil-crop systems. Furthermore, our study indicated that biochar application could reduce probabilistic health risks associated with of the presence of PTMs in crop grains, thereby contributing to human health protection. These findings highlighted the essential role of biochar in remediating PTM-contaminated lands and offered guidelines for enhancing safe crop production.

64. 题目: Photosensitization mechanisms and detoxification effect of extracellular organic matters and intracellular organic matters in antibiotics photodegradation: A case of Microcystis aeruginosa
文章编号: N24060903
期刊: Journal of Cleaner Production
作者: Jiaqi Hu, Lianxue Wei, Minxiang Zeng, Huiqi Liang, Jinfeng Lu
更新时间: 2024-06-09
摘要: Although studies on algae-mediated photodegradation for antibiotic removal in exploring cleaner environmental systems have been reported, the specific mechanism of algal organic matter for improving antibiotic photodegradation remains unclear. Herein, we proposed the enhanced efficiency mechanism of extracellular organic matter (EOM) and intracellular organic matter (IOM) in for promoting tetracycline (TC) photodegradation. The degradation efficiencies of EOM and IOM on TC were found to obtain 74.5 and 83.3%, respectively. Three-dimensional excitation emission matrix fluorescence spectroscopy combined with parallel factor analysis and Fourier transform infrared confirmed that the carbonyl compounds exhibited a significant contribution to the photosensitivity of EOM and IOM. Mechanistic investigation showed that EOM* and IOM* were identified as the principal active species in the photodegradation of TC. The EOM and IOM showed excellent detoxification ability for TC removal and remarkable tolerance in real water backgrounds, highlighting strong potential for applications. This study refined the photosensitization mechanism of algal organic matter degradation antibiotics, and offered methods and theoretical basis for environment-friendly and sustainable control of antibiotic pollutants.

65. 题目: Hydrophilic Fraction of Dissolved Organic Matter Largely Facilitated Microplastics Photoaging: Insights from Redox Properties and Reactive Oxygen Species
文章编号: N24060902
期刊: Environmental Science & Technology
作者: Weiwei Ma, Jiehong He, Lanfang Han, Chuanxin Ma, Yanpeng Cai, Xiaoyu Guo, Zhifeng Yang
更新时间: 2024-06-09
摘要: Dissolved organic matter (DOM) exists widely in natural water, which inevitably influences microplastic (MP) photoaging. Nevertheless, the impacts of DOM fractions with diverse molecular structures on MP photoaging remain to be elucidated. This study explored the photoaging mechanisms of polylactic acid (PLA)-MPs and polystyrene (PS)-MPs in the presence of DOM and its subfractions (hydrophobic acid (HPOA), hydrophobic neutral (HPON), and hydrophilic (HPI)). Across DOM fractions, HPI exhibited the highest electron accepting capacity (23 μmol e (mg C)−1) due to its abundant tannin-like species (36.8%) with carboxylic groups, which facilitated more reactive oxygen species generation (particularly hydroxyl radical), leading to the strongest photoaging rate of two MPs by HPI. However, the sequences of bond cleavage during photoaging of each MPs were not clearly shifted as revealed by two-dimensional infrared correlation spectra. Inconspicuous effects on the extent of PS- and PLA-MPs photoaging were observed for HPOA and HPON, respectively. This was mainly ascribed to the occurrence of inhibitory mechanisms (e.g., light-shielding and quenching effect) counteracting the reactive oxygen species-promoting effects. The findings identified the HPI fraction of DOM for promoting PS- and PLA-MPs photoaging rate and first constructed a link among DOM molecular structures, redox properties, and effects on MP photoaging.

66. 题目: Different contributions of microbial and plant residues to soil organic carbon accumulation during planted forest and abandoned farmland restoration, Loess Plateau, China
文章编号: N24060901
期刊: Plant and Soil
作者: Hongjian Hao, Rong Wang, Shicai Li, Duo Pian, Ning Peng, Ahejiang Sailike, Zhouchang Yu, Jiayi Shi, Xingbo Wang, Zihan Wang, Wei Zhang
更新时间: 2024-06-09
摘要:

Aims

Plant and microbial residues are the primary drivers mediating soil organic carbon (SOC) accumulation in terrestrial ecosystems. However, how plant residues and microbial residues affect SOC accumulation and the underlying mechanisms remain poorly understood, especially in the succession process of different vegetation types.

Methods

In this study, grasslands (GL) and Robinia pseudoacacia plantations (RP) restored for 10, 20, 30, and 40 years were used as research subjects on the Loess Plateau, and farmland was used as a control. Several indicators of soil physicochemical and plant characteristics, enzyme activity, amino sugar, lignin phenols were measured.

Results

The results indicated that the contents of microbial and plant residue carbon in GL and RP increased with the increasing restoration years. However, the contribution of plant residue carbon to the SOC in GL and RP gradually decreased, while microbial residue carbon showed the opposite trend. In contrast, microbial residues were the main contributor to SOC in GL (62.8–75.1%), while plant residues were the main contributor to SOC in RP (47.2–58.3%). There was a difference in the bacterial and fungal residue carbon contribution to SOC between GL and RP. In GL, the dominant contributor to SOC changed from bacterial (47.7–37.2%) to fungal residues (15.1–37.9%). But in RP, it has always been dominated by fungal residue carbon (17.4–33.3%).

Conclusions

More SOC accumulated in GL and RP in the form of microbial and plant residue carbon, respectively. In GL and RP, the contribution of carbon from fungal residues increased with the increase of recovery years. Overall, our research not only contributes to understanding the complexity of the carbon cycle in ecosystems, but also provides a valuable scientific basis for the management of soil carbon pools in different vegetation types under climate change.

67. 题目: Contrasting seasonal patterns in particle aggregation and DOM transformation in a sub-Arctic fjord
文章编号: N24060710
期刊: Biogeosciences
作者: Maria G Digernes, Yasemin V Bodur, Martí Amargant-Arumí, Oliver Müller, Jeffrey A Hawkes, Stephen G Kohler, Ulrike Dietrich, Marit Reigstad, Maria Lund Paulsen
更新时间: 2024-06-07
摘要: . Particulate (POM) and dissolved (DOM) organic matter in the ocean are important components of the Earth’s biogeochemical cycle and in constant dynamic change through physical and biochemical processes. However, they are mostly treated as two distinct entities, separated operationally by a filter. We studied the transition between the DOM and POM pools and its drivers in different seasons in a sub-Arctic fjord by monthly environmental sampling and performing aggregation-dissolution experiments. For the experiments, surface water (5 m) was either pre-filtered through a GF/F filter (0.7 µm), or left unfiltered, followed by 36 h incubations. Before and after the incubation, samples were collected for dissolved and particulate organic carbon concentrations (DOC, POC), microbial community (flow cytometry) and in-depth analysis of the molecular composition of DOM (HPLC-HRMS). During the biologically productive period, when environmental POC concentrations were high (April, June, September), the filtered water showed a rapid increase of POC concentrations by up to 88 % within 36 h, indicating net-aggregation processes. During this process in September, DOM lability decreased based on changes in average hydrogen saturation and aromaticity of DOM molecules. In contrast, during the winter period (December, February), when environmental POC concentrations were low, the experiments indicated a dissolution of POC with a net-loss up to 58 %. Simultaneously, the DOM pool became more labile during the incubation period indicated by changes in average hydrogen saturation, aromaticity, and oxygen saturation. In both periods, bacterial activity increased throughout the incubation, showing that bacterial degradation likely plays a role in the transformation of POM and DOM. Our data highlights the importance of both physically driven DOM aggregation and biologically driven POM dissolution during different periods of the year, together determining the fate of the OM pool in high latitude marine ecosystems.

68. 题目: Predicting the dissolved natural organic matter (DNOM) concentration and the specific ultraviolet absorption (sUVa) index in a browning central European stream
文章编号: N24060709
期刊: Ecological Indicators
作者: Ståle Haaland, Josef Hejzlar, Bjørnar Eikebrokk, Geir Orderud, Ma. Cristina Paule-Mercado, Petr Porcal, Jiří Sláma, Rolf David Vogt
更新时间: 2024-06-07
摘要: Over the past four decades, an increase in Dissolved Natural Organic Matter (DNOM) and colour, commonly referred to as has been noted in numerous watercourses in the northern hemisphere. Understanding the fluctuations in DNOM quality is a prerequisite for gaining insights into the biogeochemical processes governing DNOM fluxes. Such knowledge is also pivotal for water treatment plants to effectively tailor their strategies for removing DNOM from raw water. The specific ultraviolet absorbance (sUVa) index has been a widely applied measurement for assessing DNOM quality. The sUVa index is the UV absorbance (OD) of water normalized for DNOM concentration. We have used a long-term dataset spanning from 2007 to 2022, taken from the Malše River in South Bohemia, to model DNOM and the sUVa index. We have applied regression models with a process-oriented perspective and have also considered the influence of climate change. Both DNOM and the sUVa index is positively related to temperature, runoff and H, and negatively related to ionic strength over the studied period. Two distinct model approaches were employed, both explaining about 40% of the variation in sUVa over the studied period. Based on a moderate IPCC monthly climate scenario, simulations indicate that both DNOM and the sUVa index averages remain fairly stable, with a slight increase in winter season minima projected towards the year 2099. A slight decline in summer season maxima is simulated for DNOM, while the sUVa summer maximum remain stable. These findings suggest a robust resilience in both DNOM and the sUVa index against anticipated changes in temperature and runoff for the Malše River in South Bohemia.

69. 题目: Heterogeneity in Permeability and Particulate Organic Carbon Content Controls the Redox Condition of Riverbed Sediments at Different Timescales
文章编号: N24060708
期刊: Geophysical Research Letters
作者: Kewei Chen, Zhilin Guo, Yang Zhan, Eric E Roden, Chunmiao Zheng
更新时间: 2024-06-07
摘要: The hydrological and biogeochemical properties of the hyporheic zone in stream and riverine ecosystems have been extensively studied over the past two decades. Although it is widely acknowledged that sediment heterogeneity can influence biogeochemical reactions, little effort has been made to understand the role of heterogeneity on the spatiotemporal variability of riverbed redox conditions under changing flow dynamics at different timescales. Here we integrate a mechanistic model and field data to demonstrate that heterogeneity in permeability plays a vital role in modulating sediment redox conditions at both seasonal (annual) and event (daily-to-weekly) timescales, whereas heterogeneity in particulate organic carbon (POC) content only has a comparable influence on redox conditions at the seasonal timescale. These findings underscore the importance of accurately characterizing sediment heterogeneity, in terms of permeability and POC content, in quantifying biogeochemical dynamics in the riverbed and hyporheic zones of riverine ecosystems.

70. 题目: Sources and factors influencing lacustrine carbon burial over the last century: case study of Yinjia Lake, central China
文章编号: N24060707
期刊: Journal of Paleolimnology
作者: Changlin Zhan, Dejun Wan, Yongming Han, Shan Liu, Jiaquan Zhang, Hongxia Liu, Tianpeng Hu, Wensheng Xiao, Junji Cao
更新时间: 2024-06-07
摘要:

Lakes act as natural reservoirs for storing organic material, and comprehending how organic carbon (OC) and black carbon (BC) are deposited in lake sediments is crucial for understanding the global carbon cycle and its impact on climate and ecosystems. In this study, we examined changes in the deposition patterns of OC and BC in Yinjia Lake (YJL) over the past 110 years, using a 60 cm sediment core dated with 210Pb. Our aim was to discern how these changes relate to human activities and other influencing factors in the region of southeast Hubei, central China. Our findings revealed a consistent rise in total organic carbon (TOC) and total nitrogen (TN) concentrations, indicating a gradual increase from the bottom upwards. Analysis of C/N ratios and δ13C values showed that the OC in the sediment mainly originated from phytoplankton and terrestrial C3 plants. Over the past century, OC burial rates (OCBR) in the YJL core increased from 61.35 to 86.69 g m−2 yr−1, primarily due to increased primary production resulting from intensified local agriculture and urban growth. Temperature was found to influence OCBR, while precipitation had little impact on OCBR dynamics in sedimentary environments. BC burial rates in YJL ranged from 3.67 to 11.51 g m–2 yr–1, significantly exceeding those observed in other lakes worldwide. The fluctuations in BC burial rates correlated with shifts in local industrial practices and energy consumption. In recent years (post-2005), BC burial rates have declined, likely due to reduced pollutant emissions resulting from the implementation of emission-control policies in China. These results provide valuable insights into the interactions between human activities, climate variability, and carbon cycling in lacustrine environments, with implications for regional carbon budgets, ecosystem management, and climate-change mitigation strategies.

71. 题目: Decomposing the Tea Bag Index and finding slower organic matter loss rates at higher elevations and deeper soil horizons in a minerogenic salt marsh
文章编号: N24060706
期刊: Biogeosciences
作者: Satyatejas G Reddy, W Reilly Farrell, Fengrun Wu, Steven C Pennings, Jonathan Sanderman, Meagan Eagle, Christopher Craft, Amanda C Spivak
更新时间: 2024-06-07
摘要: . Environmental gradients can affect organic matter decay within and across wetlands and contribute to spatial heterogeneity in soil carbon stocks. We tested the sensitivity of decay rates to tidal flooding and soil depth in a minerogenic salt marsh using the tea bag index (TBI). Tea bags were buried at 10- and 50- cm along transects sited at lower, middle, and higher elevations that paralleled a headward eroding tidal creek. Plant and animal communities and soil properties were characterized once while replicate tea bags and porewaters were collected several times over one year. TBI decay rates were faster than prior litterbag studies in the same marsh, largely due to rapid green tea loss. Rooibos decay rates were comparable to natural marsh litter, potentially suggesting that is more useful as a standardized organic matter proxy than green tea. Decay was slowest at higher marsh elevations and not consistently related to other biotic (e.g., plants, crab burrows) and abiotic factors (e.g., porewater chemistry), indicating that local hydrology strongly affects organic matter loss rates. Tea BI rates were 32–118 % faster in the 10 cm horizon compared to 50 cm. Rates were fastest in the first three months and slowed 54–60 % at both depths between 3- and 6- months. Rates slowed further between 6- and 12- months but this was less dramatic at 10 cm (17 %) compared to 50 cm (50 %). Slower rates at depth and with time were unlikely due to the TBI stabilization factor, which was similar across depths and decreased from 6 to 12 months. Slower decay at 50 cm demonstrates that rates were constrained by the environmental conditions of this deeper horizon rather than the molecular composition of litter. Overall, these patterns suggest that hydrologic setting, which affects oxidant introduction and reactant removal and is often overlooked in marsh decomposition studies, may be a particularly important control on organic matter decay in the short term (3–12 months). transects sited at lower, middle, and higher elevations that paralleled a headward eroding tidal creek.

72. 题目: Solubility characteristics of soil humic substances as a function of pH
文章编号: N24060705
期刊: Biogeosciences
作者: Xuemei Yang, Jie Zhang, Khan M G Mostofa, Mohammad Mohinuzzaman, H Henry Teng, Nicola Senesi, Giorgio S Senesi, Jie Yuan, Yu Liu, Si-Liang Li, Xiaodong Li, Baoli Wang, Cong-Qiang Liu
更新时间: 2024-06-07
摘要: . This study investigated the solubility features, environmental consequences, and mechanisms of humic substances (HS), including humic acids (HA), fulvic acids (FA), and protein-like substances (PLS), in two soils in the pH range of 1–12. The pH-dependent presence or absence of fluorescence peaks in the individual HS components reflected their functional group proton/electron exchange features at both low and high pH values, which were related to their solubility or insolubility. In particular, alkaline pH (≥ pH 9) yielded the anionic forms (‒O‒ and ‒COO‒) of phenolic OH and carboxyl groups of HACS resulted in decreased electron/proton transfer from HS functionalities, as indicated by the decline of fluorescence peak maxima, whereas the protonic functionalities (e.g., −COOH, −OH) of HS at lower pH resulted in the formation of highly available and remains uncomplexed HS forms. The solubility of HA fractions increases with increasing pH, whereas their insolubility increases with decreasing pH, which determines their initial precipitation at pH 6 and final precipitation at pH 1, amounting approximately to 39.1–49.2 % and 3.1–24.1 % of the total DOM, respectively, in the two soils. HS insolubility arises via organo-metal and organo-mineral interactions at alkaline pH, along with HApH6 insolubility via rainwater/water discharge, whereas HApH2+FA+PLS appears to be soluble at acidic pH, thereby being transported in ambient waters via rainwater/water discharge and groundwater infiltration. These results were supported by the corresponding elemental compositions and FTIR data. Therefore, the pH-dependent behaviour of soil HS greatly contributes to a better understanding of the progressive transformation, mobility/transportation, and immobility/accumulation of HS components under various environmental conditions, with relevant implications for sustainable soil management practices and soil DOM dynamics.

73. 题目: Soil organic matter and total nitrogen as key driving factors promoting the assessment of acid–base buffering characteristics in a tea (Camellia sinensis) plantation habitat
文章编号: N24060704
期刊: Environmental Monitoring and Assessment
作者: Xin Wen, Donglei Wu, Dingjiang Chen, Peiran Xu, Tiantian Zhao, Siyu Chen, Zhenhao Zhu, Hang Zhong, Pan Chen
更新时间: 2024-06-07
摘要:

The issue of soil acidification in tea plantations has become a critical concern due to its potential impact on tea quality and plant health. Understanding the factors contributing to soil acidification is essential for implementing effective soil management strategies in tea-growing regions. In this study, a field study was conducted to investigate the effects of tea plantations on soil acidification and the associated acid–base buffering capacity (pHBC). We assessed acidification, pHBC, nutrient concentrations, and cation contents in the top 0–20 cm layer of soil across forty tea gardens of varying stand ages (0–5, 5–10, 10–20, and 20–40 years old) in Anji County, Zhejiang Province, China. The results revealed evident soil acidification due to tea plantation activities, with the lowest soil pH observed in tea gardens aged 10–20 and 20–40 years. Higher levels of soil organic matter (SOM), total nitrogen (TN), Olsen phosphorus (Olsen-P), available iron (Fe), and exchangeable hydrogen (H+) were notably recorded in 10–20 and 20–40 years old tea garden soils, suggesting an increased risk of soil acidification with prolonged tea cultivation. Furthermore, prolonged tea cultivation correlated with increased pHBC, which amplified with tea stand ages. The investigation of the relationship between soil pHBC and various parameters highlighted significant influences from soil pH, SOM, cation exchange capacity, TN, available potassium, Olsen-P, exchangeable acids (including H+ and aluminum), available Fe, and available zinc. Consequently, these findings underscore a substantial risk of soil acidification in tea gardens within the monitored region, with SOM and TN content being key driving factors influencing pHBC.

74. 题目: Application of Mg-Fe Layered Double Hydroxides/Biochar Composite for the Removal of La(III) from Aqueous Solutions
文章编号: N24060703
期刊: Water, Air, & Soil Pollution
作者: Chenglong Zou, Zhiwei Xu, Fahui Nie, Sulin Xiang, Huimin Zhang, Zhanmeng Liu
更新时间: 2024-06-07
摘要:

As a valuable strategic resource, rare earth elements are widely used in various high-end industries, however, the environmental pollution and resource recovery caused by them have also attracted wide attention. In order to remove La(III) from aqueous solution by adsorption, Mg-Fe layered double hydroxide (MgFe-LDH) was loaded onto biochar (BC) through co-precipitation method to synthesis Mg-Fe layered double hydroxide/biochar composite (HBC) in this study. Scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), specific surface area test (BET), X-ray diffraction (XRD), Fourier transform infrared (FT-IR), and X-ray photoelectron spectroscopy (XPS) were used to analyze the physical and chemical characteristics of the materials. The effects of various factors on the adsorption of La(III) by HBC were investigated. Under the optimal conditions of temperature = 308 K and pH = 6.0, the adsorption efficiency of 20 mg/L La(III) solution by 0.60 g/L adsorbent reached 97.81% within 24 h. The HBC showed good regeneration and reuse performance, the adsorption capacity of the regenerated HBC for La(III) still maintain 75.75% of the first adsorption capacity after 5 cycles. Moreover, kinetic and isothermal model fitting analysis showed that the adsorption is consistent with the pseudo-second-order kinetic model and the Langmuir model with maximum adsorption of 42.01 mg/g. Additionally, Es calculated through the D-R model is 23.12 kJ/mol, indicating that the adsorption is monomolecular and mainly chemisorption. Thermodynamic analysis demonstrated that the spontaneous endothermic process of adsorption La(III) on HBC. Overall, this study illustrates that the prepared HBC can be used as carbon-based adsorbents for the removal of La(III) in aqueous solutions.

75. 题目: Insight Mechanism of Humic Acids on Cr(VI) Detoxification and Methane Production Improvement during Anaerobic Digestion of Leachate
文章编号: N24060702
期刊: Water, Air, & Soil Pollution
作者: Hengfeng Miao, Wenfeng Fang, Kunlun Yang, Peng Gu, Xueli Ren, Zengshuai Zhang
更新时间: 2024-06-07
摘要:

Humic acids (HAs) produced during the landfill on Cr(VI) fate and their combined impact on the anaerobic digestion (AD) process has not yet been fully elucidated. This study systematically evaluated the interactions and mechanism of HAs on the AD of Cr(VI)-contaminated leachate. Results indicated that high concentrations of HAs (i.e., 200, 500, 1000 mg/L) detoxified the Cr(VI) on AD and the maximum methane production of 1011.63 ± 248.01 mL/g COD was obtained at 500 mg/L HAs, representing an 18.4% increase compared to the control group. Mechanistic studies demonstrated that high concentrations of HAs (i.e., C4-C5) detoxified the Cr(VI) on AD via adsorption and reduction, and the enhanced direct interspecies electron transfer (DIET) played an important role in methane production. The adsorption capacity (32.89 mg Cr(VI)/g HAs) was significantly higher than the granular sludge (3.29 mg Cr(VI)/g TS) and adsorbed Cr(VI) was reduced to less toxic Cr(III) due to the presence of functional groups of HAs (e.g., hydroxyl and phenolic groups), achieving detoxification of Cr(VI) on AD. The increase of viable microbial cells proved the detoxification of high HAs concentrations. Moreover, the increase in the abundance of Syntrophomonas and Methanosaeta has led to the higher methane production at high HAs concentration.

76. 题目: Iron-bound Organic Carbon Distribution in Freshwater Wetlands with Varying Vegetation and Hydrological Regime
文章编号: N24060701
期刊: Wetlands
作者: Wei Chen, Weixiang Chen, Kai Dong, Qingchun Guo, Guoxiang Wang, Jiangang Han, Xinhou Zhang
更新时间: 2024-06-07
摘要:

Iron (Fe) oxides have attracted much attention due to their role as optimal minerals for long-term soil organic carbon (SOC) sequestration. However, little is known about Fe-bound organic carbon (OC) characteristics in wetlands of Yangtze-Huaihe Basin. Here, we determined Fe-bound OC contents in topsoil (0–5 cm) and subsoil (10–20 cm) in seven wetlands with varying vegetation and hydrological regime, and analyzed influencing factors and pathway. Fe-bound OC contents ranged 2.14 ~ 31.2 mg/g in topsoil and 2.00 ~ 15.8 mg/g in subsoil, and contributed 8.33%~41.9% to SOC across two soil layers. Fe-bound OC: Fed (including short-range-order and crystalline Fe(III) oxides) ratios were generally over 6, indicating iron oxides associated SOC mainly through co-precipitation rather than sorption. Fe-bound OC characteristics varied among wetland types, where the contents were generally higher in the flooded versus unflooded wetlands (with the same vegetation). Nevertheless, the unflooded wetlands had higher proportions of Fe-bound OC in SOC, indicating an enhancement of aerobic conditions to Fe-bound OC formation. Fe-bound OC contents were positively correlated to contents of SOC, Fep (including colloidal and organic matter-chelated iron oxides), and total nitrogen in both soil layers, and negatively to pH in topsoil. Structural equation model revealed that wetland type determined Fe-bound OC by affecting SOC and Fep. Our findings reveal variations of Fe-bound OC characteristics among wetlands in Yangtze-Huaihe Basin. The unflooded relative to flooded wetlands (with the same vegetation) had lower or comparable Fe-bound OC contents, yet they exerted greater contribution to SOC. Wetland type influences Fe-bound OC mainly through SOC and Fep.

77. 题目: Influence of Low-Molecular-Weight Organic Acids on Arsenic Adsorption–Desorption Behavior in Soil: Implications for Biochar Amendments
文章编号: N24060513
期刊: Water, Air, & Soil Pollution
作者: Wenzhe Chen, Qiuxiang Huang, Jinyan Gao, Yongbing Cai, Liang Xiao, Yan Wang, Fande Meng, Guodong Yuan
更新时间: 2024-06-05
摘要:

Low-molecular-weight organic acids (LMWOAs) play a significant role in mediating the adsorption and desorption of metal(loid)s such as arsenic (As) in the soil environment. Biochar, a potential soil amendment, can be a source of LMWOAs. This study delves into the impact of malonic acid (MA) and citric acid (CA), two prevalent LMWOAs, on As adsorption–desorption dynamics within a soil–water system, both with and without the addition of biochar derived from Paulownia biowaste. Results reveal that MA and CA induce a concentration-dependent decrease in soil pH, with CA exhibiting greater efficacy, reaching a minimum pH of 2.86. The addition of biochar partially counteracts this pH reduction. While at low concentrations (< 0.5 mmol/L), MA and CA enhanced As adsorption onto the soil, at higher concentrations (0.5–40 mmol/L), they promoted As desorption, with CA exerting a more pronounced effect. Incorporating biochar (at a 3% dose) further amplified As desorption by 37%–223% for MA and 4%–76% for CA. Mechanistically, lowering soil pH and complex formation with As via carboxyl groups are proposed as critical drivers for LMWOA-induced alternations in As adsorption–desorption. The Langmuir model (R2 > 0.95) emerges as a superior fit for As adsorption–desorption compared to the Freundlich model (R2 < 0.90), suggesting monolayer adsorption predominance in the system. These findings shed light on the intricate role of LMWOA in As geochemistry within the soil, underscoring potential risks associated with using biochar as a soil amendment in As-contaminated areas.

78. 题目: Mechanisms for synergistically enhancing cadmium remediation performance of biochar: Silicon activation and functional group effects
文章编号: N24060512
期刊: Bioresource Technology
作者: Anyu Li, Tao Lu, Yutong Zhang, Shengjun Deng, Xianjie Duan, Guohong Qiu
更新时间: 2024-06-05
摘要: This work proposes an advanced biochar material (β-CD@SiBC) for controllable transformation of specific silicon (Si) forms through endogenous Si activation and functional group introduction for efficient cadmium (Cd) immobilization and removal. The maximum adsorption capacity of β-CD@SiBC for Cd(II) reached 137.6 mg g with a remarkable removal efficiency of 99 % for 200 mg LCd(II). Moreover, the developed β-CD@SiBC flow column exhibited excellent performance at the environmental Cd concentration, with the final concentration meeting the environmental standard for surface water quality (0.05 mg L). The remediation mechanism of β-CD@SiBC could be mainly attributed to mineral precipitation and ion exchange, which accounted for 42 % and 29 % of the remediation effect, respectively, while functional group introduction enhanced its binding stability with Cd. Overall, this work proposes the role and principle of transformation of Si forms within biochar, providing new strategies for better utilizing endogenous components in biomass.

79. 题目: Peatland Wildfires Enhance Nitrogen-Containing Organic Compounds in Marine Aerosols over the Western Pacific
文章编号: N24060511
期刊: Environmental Science & Technology
作者: Shujun Zhong, Rui Liu, Siyao Yue, Peng Wang, Qiang Zhang, Chao Ma, Junjun Deng, Yulin Qi, Jialei Zhu, Cong-Qiang Liu, Kimitaka Kawamura, Pingqing Fu
更新时间: 2024-06-05
摘要: Peatland wildfires contribute significantly to the atmospheric release of light-absorbing organic carbon, often referred to as brown carbon. In this study, we examine the presence of nitrogen-containing organic compounds (NOCs) within marine aerosols across the Western Pacific Ocean, which are influenced by peatland fires from Southeast Asia. Employing ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) in electrospray ionization (ESI) positive mode, we discovered that NOCs are predominantly composed of reduced nitrogenous bases, including CHN+ and CHON+ groups. Notably, the count of NOC formulas experiences a marked increase within plumes from peatland wildfires compared to those found in typical marine air masses. These NOCs, often identified as N-heterocyclic alkaloids, serve as potential light-absorbing chromophores. Furthermore, many NOCs demonstrate pyrolytic stability, engage in a variety of substitution reactions, and display enhanced hydrophilic properties, attributed to chemical processes such as methoxylation, hydroxylation, methylation, and hydrogenation that occur during emission and subsequent atmospheric aging. During the daytime atmospheric transport, aging of aromatic N-heterocyclic compounds, particularly in aliphatic amines prone to oxidation and reactions with amine, was observed. The findings underscore the critical role of peatland wildfires in augmenting nitrogen-containing organics in marine aerosols, underscoring the need for in-depth research into their effects on marine ecosystems and regional climatic conditions.

80. 题目: Seasonal studies of aquatic humic substances from Amazon rivers: characterization and interaction with Cu (II), Fe (II), and Al (III) using EEM-PARAFAC and 2D FTIR correlation analyses
文章编号: N24060510
期刊: Environmental Monitoring and Assessment
作者: Isabela Carreira Constantino, Lucas Raimundo Bento, Vinicius Sarracini Santos, Leila Soares da Silva, Amanda Maria Tadini, Stéphane Mounier, Alessandro Piccolo, Riccardo Spaccini, Marinônio Lopes Cornélio, Fabiana Maria Monteiro Paschoal, Ézio Sargentini Junior, Altair Benedito Moreira, Márcia Cristina Bisinoti
更新时间: 2024-06-05
摘要:

Aquatic humic substances (AHS) are defined as an important components of organic matter, being composed as small molecules in a supramolecular structure and can interact with metallic ions, thereby altering the bioavailability of these species. To better understand this behavior, AHS were extracted and characterized from Negro River, located near Manaus city and Carú River, that is situated in Itacoatiara city, an area experiencing increasing anthropogenic actions; both were characterized as blackwater rivers. The AHS were characterized by 13C nuclear magnetic ressonance and thermochemolysis GC–MS to obtain structural characteristics. Interaction studies with Cu (II), Al (III), and Fe (III) were investigated using fluorescence spectroscopy applied to parallel factor analysis (PARAFAC) and two-dimensional correlation spectroscopy with Fourier transform infrared spectroscopy (2D-COS FTIR). The AHS from dry season had more aromatic fractions not derived from lignin and had higher content of alkyls moities from microbial sources and vegetal tissues of autochthonous origin, while AHS isolated in the rainy season showed more metals in its molecular architecture, lignin units, and polysacharide structures. The study showed that AHS composition from rainy season were able to interact with Al (III), Fe (III), and Cu (II). Two fluorescent components were identified as responsible for interaction: C1 (blue-shifted) and C2 (red-shifted). C1 showed higher complexation capacities but with lower complexation stability constants (KML ranged from 0.3 to 7.9 × 105) than C2 (KML ranged from 3.1 to 10.0 × 105). 2D-COS FTIR showed that the COO and C-O in phenolic were the most important functional groups for interaction with studied metallic ions.

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