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1. 题目: Recent advances in catalyst design, performance, and challenges of metal-heteroatom-co-doped biochar as peroxymonosulfate activator for environmental remediation
文章编号: N24042106
期刊: Environmental Research
作者: Ganapaty Manickavasagam, Chao He, Kun-Yi Andrew Lin, Mardiana Saaid, Wen-Da Oh
更新时间: 2024-04-21
摘要: The escalation of global water pollution due to emerging pollutants has gained significant attention. To address this issue, catalytic peroxymonosulfate (PMS) activation technology has emerged as a promising treatment approach for effectively decontaminating a wide range of pollutants. Recently, modified biochar has become an increasingly attractive as PMS activator. Metal-heteroatom-co-doped biochar (MH-BC) has emerged as a promising catalyst that can provide enhanced performance over heteroatom-doped and metal-doped biochar due to the synergism between metal and heteroatom in promoting PMS activation. Therefore, this review aims to discuss the fabrication pathways (i.e., internal vs external doping and pre-vs post-modification) and key parameters (i.e., source of precursors, synthesis methods, and synthesis conditions) affecting the performance of MH-BC as PMS activator. Subsequently, an overview of all the possible PMS activation pathways by MH-BC is provided. Subsequently, Also, the detection, identification, and quantification of several reactive species (such as, OH, SO, O, O, and high valent oxo species) generated in the catalytic PMS system by MH-BC are also evaluated. Lastly, the underlying challenges associated with poor stability, the lack of understanding regarding the interaction between metal and heteroatom during PMS activation and quantification of radicals in multi-ROS system are also deliberated.

2. 题目: Revegetation of disturbed land reclaimed with suboptimal topsoil replacement depth and organic amendments
文章编号: N24042105
期刊: Land Degradation & Development
作者: Takudzwa Nawu, Francis Zvomuya, Theresa Adesanya, Sylvie Renault, Inoka Amarakoon, Asfaw Bekele
更新时间: 2024-04-21
摘要: Successful reclamation and revegetation of disturbed sites depends on the availability of sufficient topsoil. Current regulations in western Canada require the replacement of ≥80% of the original topsoil depth (TRD) to restore pre‐disturbance productivity. However, salvaged topsoil at many legacy and other disturbed sites is often insufficient to achieve the 80% TRD (TRD80). This 5‐year study examined vegetation responses to 50% TRD without organic amendment (TRD50) or amended with either peat (PTRD50) or biochar (BTRD50), relative to the TRD80 treatment, following borrow site reclamation in northeastern Alberta, Canada. Amendments were applied once at rates calculated to bring organic carbon in the topsoil to concentrations approximating those in the TRD80 treatment. Tree and shrub seedling mixes were transplanted following amendment application and vegetation attributes were measured annually thereafter. Results showed that PTRD50 performed as well as TRD80 and outperformed BTRD50 with respect to native species' canopy cover and tree seedling height. Canopy covers of forb and non‐native species decreased significantly whereas those of graminoid and native species increased over time for all treatments. Across treatments, native plant species richness increased by 5% per year while non‐native species richness decreased by 19% per year. Overall, peat showed a satisfactory rate of recovery and a trajectory toward the natural boreal forest, indicating its potential to improve reclamation success at disturbed boreal sites where salvaged soil is insufficient to attain equivalent land capability. This finding will provide an additional tool for regulators seeking to refine land reclamation guidelines for such sites in boreal forest regions.

3. 题目: Impact of aridity rise and arid lands expansion on carbon‐storing capacity, biodiversity loss, and ecosystem services
文章编号: N24042104
期刊: Global Change Biology
作者: Akash Tariq, Jordi Sardans, Fanjiang Zeng, Corina Graciano, Alice C Hughes, Gerard Farré‐Armengol, Josep Peñuelas
更新时间: 2024-04-21
摘要: Drylands, comprising semi‐arid, arid, and hyperarid regions, cover approximately 41% of the Earth's land surface and have expanded considerably in recent decades. Even under more optimistic scenarios, such as limiting global temperature rise to 1.5°C by 2100, semi‐arid lands may increase by up to 38%. This study provides an overview of the state‐of‐the‐art regarding changing aridity in arid regions, with a specific focus on its effects on the accumulation and availability of carbon (C), nitrogen (N), and phosphorus (P) in plant–soil systems. Additionally, we summarized the impacts of rising aridity on biodiversity, service provisioning, and feedback effects on climate change across scales. The expansion of arid ecosystems is linked to a decline in C and nutrient stocks, plant community biomass and diversity, thereby diminishing the capacity for recovery and maintaining adequate water‐use efficiency by plants and microbes. Prolonged drought led to a −3.3% reduction in soil organic carbon (SOC) content (based on 148 drought‐manipulation studies), a −8.7% decrease in plant litter input, a −13.0% decline in absolute litter decomposition, and a −5.7% decrease in litter decomposition rate. Moreover, a substantial positive feedback loop with global warming exists, primarily due to increased albedo. The loss of critical ecosystem services, including food production capacity and water resources, poses a severe challenge to the inhabitants of these regions. Increased aridity reduces SOC, nutrient, and water content. Aridity expansion and intensification exacerbate socio‐economic disparities between economically rich and least developed countries, with significant opportunities for improvement through substantial investments in infrastructure and technology. By 2100, half the world's landmass may become dryland, characterized by severe conditions marked by limited C, N, and P resources, water scarcity, and substantial loss of native species biodiversity. These conditions pose formidable challenges for maintaining essential services, impacting human well‐being and raising complex global and regional socio‐political challenges.

4. 题目: From waste to wealth: Exploring biochar’s role in environmental remediation and resource optimization
文章编号: N24042103
期刊: Journal of Cleaner Production
作者: Thamiris Renata Martiny, Luisa Bataglin Avila, Tereza Longaray Rodrigues, Luana Vaz Tholozan, Lucas Meili, André Ricardo Felkl de Almeida, Gabriela Silveira da Rosa
更新时间: 2024-04-21
摘要: In today's technologically advancing and increasingly urbanized world, the search for new materials like biochar has become crucial to address environmental challenges such as pollution and agricultural needs. Biochar, derived from pyrolyzed biomass, offers a sustainable solution for soil improvement and pollution control. This review explores biochar's diverse applications in waste management, pollution control, and agriculture, emphasizing its potential for promoting sustainability and circular economy practices, while also discussing emerging applications like supercapacitors. Compared to previous works, this review offers a comprehensive examination of biochar's diverse applications and its potential for future trends in environmental sustainability.

5. 题目: Differentiation and quantification of extracellular polymeric substances from microalgae and bacteria in the mixed culture
文章编号: N24042102
期刊: Water Research
作者: Tian Ren, Yun Zhou, Xiaocai Cui, Beibei Wu, Bruce E Rittmann
更新时间: 2024-04-21
摘要: Extracellular polymeric substances (EPS) play significant roles in the formation, function, and interactions of microalgal-bacteria consortia. Understanding the key roles of EPS depends on reliable extraction and quantification methods, but differentiating of EPS from microalgae versus bacteria is challenging. In this work, cation exchange resin (CER) and thermal treatments were applied for total EPS extraction from microalgal-bacteria mixed culture (MBMC), flow cytometry combined with SYTOX Green staining was applied to evaluate cell disruption during EPS extraction, and auto-fluorescence-based cell sorting (AFCS) was used to separate microalgae and bacteria in the MBMC. Thermal extraction achieved much higher EPS yield than CER, but higher temperature and longer time reduced cell activity and disrupted the cells. The highest EPS yield with minimal loss of cell activity and cell disruption was achieved using thermal extraction at 55℃ for 30 min, and this protocol gave good results for MBMC with different microalgae:bacteria (M:B) mass ratios. AFCS combined with thermal treatment achieved the most-efficient biomass differentiation and low EPS loss (<4.5 %) for the entire range of M:B ratios. EPS concentrations in bacteria were larger than in microalgae: 42.8 ± 0.4 mg COD/g TSS versus 9.19 ± 0.38 mg COD/g TSS. These findings document sensitive and accurate methods to extract and quantify EPS from microalgal-bacteria aggregates.

6. 题目: Effect of foraging tunnels created by small subterranean mammals on soil microbial biomass carbon and organic carbon storage in alpine grasslands
文章编号: N24042101
期刊: Catena
作者: Huan Yang, Xiao Pan Pang, Jie Li, Yuan Yuan Duan, Zheng Gang Guo
更新时间: 2024-04-21
摘要: Extensive foraging tunnel disturbances created by small subterranean mammals have important impacts on soil physical properties and nutrients in grasslands. This study took plateau zokor () as an example mammal to investigate the impacts of foraging tunnel disturbances by small subterranean mammals on soil microbial biomass carbon (SMBC) and soil organic carbon (SOC) storage. A paired design was used to locate 90 tunnel quadrats and 90 non-tunnel quadrats in alpine grasslands across three sites. This study showed that SMBC, SOC concentrations and SOC storage in tunnel quadrats were 47.4 %, 26.8 % and 22.0 % lower than those in non-tunnel quadrats, respectively. This study also showed that soil microbial biomass nitrogen was a major factor affecting SOC storage in non-tunnel quadrats, while it was not a major factor in tunnel quadrats. Soil pH and soil ammonium nitrogen were not major factors in non-tunnel quadrats, while they were the major factors influencing SOC storage in tunnel quadrats. In contrast to non-tunnel quadrats, foraging tunnel disturbances led to a new pathway in which soil pH positively affected SOC storage in tunnel quadrats. The findings of this study demonstrated that foraging tunnel disturbances had negative impacts on soil fertility due to lower SMBC concentrations and might cause soil carbon loss in alpine grasslands because of lower SOC storage. Given the effect of foraging tunnels on soil carbon cycling and climate regulation in the Qinghai-Tibet Plateau's alpine grasslands, it is crucial to take them into account when assessing grassland carbon storage and formulating strategies for effective grassland management and conservation.

7. 题目: Characterizing the Impact of Cyanobacterial Blooms on the Photoreactivity of Surface Waters from New York Lakes: A Combined Statewide Survey and Laboratory Investigation
文章编号: N24042014
期刊: Environmental Science & Technology
作者: Joseph Wasswa, MaryGail Perkins, David A Matthews, Teng Zeng
更新时间: 2024-04-20
摘要: Cyanobacterial blooms introduce autochthonous dissolved organic matter (DOM) into aquatic environments, but their impact on surface water photoreactivity has not been investigated through collaborative field sampling with comparative laboratory assessments. In this work, we quantified the apparent quantum yields (Φapp,RI) of reactive intermediates (RIs), including excited triplet states of dissolved organic matter (3DOM*), singlet oxygen (1O2), and hydroxyl radicals (OH), for whole water samples collected by citizen volunteers from more than 100 New York lakes. Multiple comparisons tests and orthogonal partial least-squares analysis identified the level of cyanobacterial chlorophyll a as a key factor in explaining the enhanced photoreactivity of whole water samples sourced from bloom-impacted lakes. Laboratory recultivation of bloom samples in bloom-free lake water demonstrated that apparent increases in Φapp,RI during cyanobacterial growth were likely driven by the production of photoreactive moieties through the heterotrophic transformation of freshly produced labile bloom exudates. Cyanobacterial proliferation also altered the energy distribution of 3DOM* and contributed to the accelerated transformation of protriptyline, a model organic micropollutant susceptible to photosensitized reactions, under simulated sunlight conditions. Overall, our study provides insights into the relationship between the photoreactivity of surface waters and the limnological characteristics and trophic state of lakes and highlights the relevance of cyanobacterial abundance in predicting the photoreactivity of bloom-impacted surface waters.

8. 题目: Both organic fertilizer and biochar applications enhanced soil nutrition but inhibited cyanobacterial community in paddy soils
文章编号: N24042013
期刊: Frontiers in Environmental Science
作者: Xiangbo Zou, Xinyu Jiang, Jinshun Guan, Shaoqiang Huang, Chuangting Chen, Tiancheng Zhou, Cao Kuang, Ji Ye, Tong Liu, Jiong Cheng, Sanxiong Chen, Shiqin Yu
更新时间: 2024-04-20
摘要: Cyanobacteria plays an important role in other ecological processes in paddy soils, particularly in terms of nitrogen input to the ecosystem. Organic fertilizer and biochar are common soil amendment materials used to preserve soil health in agricultural intensification background. However, the consequent increase in soil nutrition may inhibit soil cyanobacteria, therefore decreasing nitrogen fixation and changes other soil processes. To test this hypothesis, we established a 2 × 2 full factorial experiment in a paddy field in South China, which included four treatments: Ctr (control, receiving no organic fertilization or biochar addition), +OF (organic fertilizer application only), +BC (biochar application only), and +Mix (organic fertilizer and biochar applications). The soil cyanobacterial community was analyzed using metagenomics technology, and 14 soil property variables were measured. The results suggested that organic fertilizer was effective in enhancing nutrient levels, leading to a significant increase in extractable and soluble nitrogen, phosphorus, and potassium. In contrast, biochar application had a stronger effect on total soil carbon, potassium, and soil pH. However, both organic fertilizer and biochar applications induced significant decreases in overall cyanobacterial abundance and species number. Dominant cyanobacterial organisms, particularly the two most abundant genera, Leptolyngbya and Phormidium, experienced a greater decrease compared to others. Canonical correlation analyses and structural equation models indicated that organic fertilizer and biochar applications affected soil cyanobacterial community mainly through soil available nitrogen and pH. In total, the present study highlighted that both organic fertilizer and biochar applications in paddy soils notably change soil physicochemical traits, inhibiting rather than benefiting cyanobacterial microorganisms, especially the dominant ones, and potentially reducing nitrogen input. Our study reveals the impacts of oragnic fertilizer and biochar applications in paddies on soil cyanobacteria and how the consequent changes in soil properties mediate this impact, thereby enhancing our understanding of the responses of different soil microbial groups to soil improvement measures.

9. 题目: Activating peroxymonosulfate by high nitrogen-doped biochar from lotus pollen for efficient degradation of organic pollutants from water: Performance, kinetics and mechanism investigation
文章编号: N24042012
期刊: Separation and Purification Technology
作者: Ziling Zhu, Xiaoben Yang, Xing Ye, Qianglin Li, Jiaqiang Wang, Ling Wu, Zheng-Hong Huang, Ming-Xi Wang
更新时间: 2024-04-20
摘要: Nitrogen-doped biochars are promising metal-free catalysts for peroxymonosulafe (PMS) activation due to their low-cost, high chemical stability and metal-free leaching. However, the nitrogen content in the biochar is usually low with unsatisfactory performance, and the in-depth analysis on the kinetic of pollutant degradation is still insufficient. Herein, high nitrogen doped biochars were prepared by one-step pyrolysis of lotus pollen (LP) and melamine, which were used to trigger PMS for degrading organic pollutants in water. The optimized nitrogen-doped LP biochar (N-LPC-5) possessed ultrahigh nitrogen content (up to 15.75 at%) and abundant oxygen-containing functional groups, which exhibited the optimal performance in activating PMS to degrade reactive black 5, atrazine, ketoprofen and p-nitrophenol. The removal efficiency for all the organic pollutants in the N-LPC-5/PMS system can reach above 90 % in 20 min, and the degradation performance was outstanding in a wide pH range from 2.0 to 10.5. The pollutant degradation followed a two-stage process including a fast stage of initial oxidation and a slow stage. An appropriate mathematic kinetic model was proposed to describe the two-stage reaction. Fitting the experimental data with the proposed kinetic model, the initial removal rate and the maximal oxidation capacity can be obtained accordingly, and the correlation coefficients were very close to 1.0, indicative of the excellent fitness of the proposed model. In addition, the catalytic mechanisms such as the reactive oxygen species, electron-transfer pathway and active sites were also investigated by various techniques. The present study highlights the tremendous potential of N-biochar for wastewater remediation, and helps to understand the dynamic kinetics and catalytic mechanism of metal-free carbon activating PMS.

10. 题目: Continuous straw returning enhances the carbon sequestration potential of soil aggregates by altering the quality and stability of organic carbon
文章编号: N24042011
期刊: Journal of Environmental Management
作者: Jun Zhang, Fenghua Zhang, Lei Yang
更新时间: 2024-04-20
摘要: Soil structure plays an important role in organic carbon (OC) sequestration, thereby influencing soil fertility and changes in global climate. However, aggregate OC chemical structure changes due to long-term return of straw in oasis farmland of arid northwest China remains unclear. This study conducted 0-, 5-, 10-, 15-, and 20-year straw returning experiments during which three soil components where measured: (1) the functional carbon (C) pool and macroaggregates; (2) microaggregates and silt + clay; (3) the chemical structure of soil OC (SOC). The results demonstrated that in comparison with the control, straw return increased SOC, particulate OC (POC), and mineral-associated OC (MAOC) by 21.90%–63.51%, 5.00%–31.00%, and 46.00%–226.00%, respectively. With increasing duration of straw return, microaggregates transitioned to macroaggregates, and percentages of soil macroaggregates under 10-year straw return increased by 20.26%, 3.39%, 4.40%, and 11.12% compared with that under 0-, 5-, 15- and 20-year straw return, respectively. Soil geometric mean diameter (GMD) and mean weight diameter (MWD) first increased and then decreased, with maximum values after 10-year straw return at 1.20 mm and 1.63 mm, respectively. Solid state C NMR (Nuclear Magnetic Resonance) indicated O-alkyl C to be the dominant chemical component of soil OC over different years of straw return. There were increases in aromatic C, aromaticity, and hydrophobicity up to 10-year straw return, after which they decreased. A mantel test confirmed positive correlations of the distributions of macroaggregates, microaggregates, OC of macroaggregates, and silt + clay with MWD and GMD, whereas the OC content of aggregates was positively correlated with O-OA and hydrophobicity. Long-term straw returns improved soil structure and stabilized soil OC, thereby facilitating soil sequestration of OC.

11. 题目: Synergistic oxidation of humic acid treated by H2O2/O3 activated by CuCo/C with high efficiency and wide pH range
文章编号: N24042010
期刊: Journal of Environmental Management
作者: Senwen Tan, Kun Long, Wang Chen, Huan Liu, Siyu Liang, Qian Zhang
更新时间: 2024-04-20
摘要: Combination of oxidation processes are one of the most promising humic acid treatment technologies. Single oxidant or even two oxidants in advance oxidation process can hardly achieve satisfactory removal efficiency of refractory organic matter, mainly humic acid, in the treatment process of reverse osmosis concentrates from landfill leachate. To solve this problem, this study investigated the synergistic degradation of Humic acid () using a Cu and Co supported on carbon catalyst (CuCo/C) in a Hydrogen peroxide (HO) with ozone (O) system. The catalyst was characterized by performing SEM, XRD, BET, XPS and FTIR technologies. UV–vis spectra, 3D Excitation Emission Matrix Spectra (3D-EEM) and gas chromatography-mass spectrometry (GC–MS) were applied for exploring degradation mechanism of HA. To further understand the oxidation mechanism, electron paramagnetic resonance (EPR) was used to evaluate the generation of hydroxyl (OH) and superoxide radicals (O). As a result, CuCo/C catalyst possessed stable catalytic performance for HA degradation with a wide pH range from 5 to 8, while T = 40 °C,catalyst dosage of 2.4 g/L,O intake rate of 0.15 g/min and HO dosage of 1.92 mL/L, the degradation rate of total organic carbon (TOC) achieved 40–46.5 mg·Lmin. As affirmed by the EPR, OH and O were effectively generated with addition of the CuCo/C catalyst. Degradation performance of UV proved that the catalytic activity can still be maintained above 95% with removal rate of 82% after 5 cycles reuse. GC-MS shows that the oxidation products mainly consist of amide, benzoheterocyclic ring and carboxylic acid. This work promotes an effective method for degrading HA, which has the potential for satisfactory application in landfill leachate.

12. 题目: Preferential adsorption of nitrogen- and phosphorus-containing organic compounds to minerals in soils: A review
文章编号: N24042009
期刊: Soil Biology and Biochemistry
作者: Marie Spohn
更新时间: 2024-04-20
摘要: There is growing evidence that many nitrogen- and phosphorus-containing organic compounds in soils have on average a higher affinity for adsorption to mineral surfaces than nutrient-free organic compounds. This leads to preferential enrichment of organic nitrogen and phosphorus on mineral surfaces and has important implications for the architecture of organo-mineral associations in soils. Furthermore, the preferential adsorption of organic nitrogen and organic phosphorus compounds likely also influences carbon, nitrogen, and phosphorus cycling in terrestrial ecosystems since sorption of organic compounds to minerals slows down their decomposition. This contribution reviews studies on the sorption of soil organic nitrogen and phosphorus to minerals, guided by the questions; what compounds are soil organic nitrogen and phosphorus composed of and why do these compounds have a comparably high affinity to adsorb to minerals How do soil properties influence adsorption of organic nitrogen and phosphorus to minerals and why does preferential adsorption of organic nitrogen and phosphorus matter for element cycling Furthermore, this article identifies hypotheses for future research about the structure of organo-mineral associations, biochemical element cycling, and the role of stoichiometry for soil organic matter dynamics.

13. 题目: Evaluation of particulate organic carbon from MODIS-Aqua in a marine-coastal water body
文章编号: N24042008
期刊: Environmental Science and Pollution Research
作者: Enrique De Jesús Morales-Acuña, Sergio Aguíñiga-García, Rafael Cervantes-Duarte, Mara Yadira Cortés, Diana Escobedo-Urías, Norman Silverberg
更新时间: 2024-04-20
摘要:

La Paz Bay (LPB) in Mexico is one of the largest marine-coastal bodies of water in the Gulf of California (GC) and is ecologically important for the feeding, reproduction, and refuge of marine species. Although particulate organic carbon (POC) is an important reservoir of oceanic carbon and an indicator of productivity in the euphotic zone, studies in this region are scarce. This study evaluates the performance of satellite-derived POC in LPB from January 2003 to December 2020. The metrics obtained for COP (({ ext{RMSE}}=33.8 {mathrm{ mg m}}^{-3}); ({P}_{bias}=29.6\%) y({r}_{P}=0.4mathrm{ con} p<0.05)), Chla-a (({ ext{RMSE}}=0.23{mathrm{ mg m}}^{-3}); ({P}_{bias}=-4.3 \%) y({r}_{P}=0.94mathrm{ con} p<0.05)), and SST (({ ext{RMSE}}=2.3^circ { ext{C}}); ({P}_{bias}=-2.2 \%) y({r}_{P}=0.92mathrm{ con} p<0.05)) establish that although in some cases there was a slight over/underestimation, the satellite estimates consistently represent the variability and average values measured in situ. On the other hand, the spatio-temporal analysis of the POC allowed us to identify two seasons with their respective transition periods and five subregions in which the POC is characterized by having its maximum variability; two of these coincide with the locations of the eddies reported for the winter and summer seasons in the LPB, while the following three are located: one in the coastal zone and in the two areas in which the LPB interacts with the GC. The associations, variability nodes, and multiple linear regression analysis suggest that POC fluctuations in the LPB respond mainly to biological processes and, to some extent, to the seasonality of SST and wind. Finally, our results justify the use of the MODIS-Aqua satellite POC for studies in marine-coastal water bodies with similar characteristics to the LPB and suggest that this water body can be considered a reservoir for the marine region of northwestern Mexico.

14. 题目: Insights into remediation of cadmium and lead contaminated-soil by Fe-Mn modified biochar
文章编号: N24042007
期刊: Journal of Environmental Chemical Engineering
作者: Shengfeng Yang, Qingchao Xiao, Bin Li, Tao Zhou, Qihong Cen, Zewei Liu, Yue Zhou
更新时间: 2024-04-20
摘要: Heavy metal contamination, particularly by lead and cadmium, poses a significant environmental challenge. Indiscriminate disposal of crop residues exacerbates environmental concerns. In this study, broad bean straw was utilized to produce biochar (BC), and further modifications were made using FeCl-6 HO and KMnO to obtain Iron-Manganese Modified Biochar (FMBC) for remediating cadmium and lead-contaminated soil. Results show that both BC and FMBC increased soil pH, available phosphorus, and potassium compared to the control groups. Adding 5 % BC led to a notable reduction of 60.98 % in available cadmium and 51.63 % in available lead. Simultaneously, FMBC decreased active cadmium and lead by 57.51–73.73 % and 52.25–69.87 %, respectively. Furthermore, FMBC decreased the content of cadmium and lead in the unstable state while increasing content in the residual state, demonstrating its ability to reduce accumulation in plant tissues. FMBC adsorption mechanisms primarily involve surface complexation and co-precipitation, where oxygen-containing functional groups form stable complexes with free cadmium and lead ions. In conclusion, FMBC proved to be an effective, environmentally friendly soil remediation agent with strong adsorption capabilities and a prolonged shelf-life. This provides a promising solution to alleviate the pollution of heavy metals such as cadmium and lead in soil.

15. 题目: Mechanistic investigation of Pb2+ adsorption on biochar modified with sodium alginate composite zeolitic imidazolate framework-8
文章编号: N24042006
期刊: Environmental Science and Pollution Research
作者: Jun Peng, Qian Xiao, Ziwei Wang, Fang Zhou, Junxia Yu, Ruan Chi, Chunqiao Xiao
更新时间: 2024-04-20
摘要:

For the serious situation of heavy metal pollution, the use of cheap, clean, and efficient biochar to immobilize heavy metals is a good treatment method. In this paper, SA@ZIF-8/BC was prepared for the adsorption of Pb2+ in solution using sodium alginate (SA) and zeolitic imidazolate framework-8 (ZIF-8) modified corn cob biochar. The results showed that the specific surface area of modified biochar was greatly improved, with good adsorption capacity for Pb2+, strong anti-interference ability, and good economy. At the optimal adsorption pH of 5, the adsorption model of Pb2+ by SA@ZIF-8/BC was more consistent with the pseudo-second-order kinetic model and Langmuir isotherm model. This indicates that the adsorption of Pb2+ by SA@ZIF-8/BC is chemisorption and monolayer adsorption. The maximum adsorption of modified biochar was 300 mg g−1, which was 2.38 times higher than that of before modified BC (126 mg g−1). The shift in binding energy of functional groups before and after adsorption of SA@ZIF-8/BC was studied by XPS, and it was found that hydroxyl and carboxyl groups played an important role in the adsorption of Pb2+. It was demonstrated that this novel adsorbent can be effectively used for the treatment of Pb pollution in wastewater.

16. 题目: Binding characteristics of heavy metal contaminations and sewage sludge DOM products: Determination based on complexing-variance partitioning analysis
文章编号: N24042005
期刊: Chemical Engineering Journal
作者: Hongyang Cui, Xinlin Zhang, Yumeng Wang, Xu Zhang, Jie Lv
更新时间: 2024-04-20
摘要: Dissolved organic matter (DOM), known for its ability to influence the environmental geochemical behavior of heavy metals, is widely regarded as an eco-friendly substance for mitigating heavy metal pollution in the environment. Understanding the unique properties of DOM as a ligand is essential for comprehending its impact on the migration and toxicity of metal pollutants. In this study, sewage sludge composting DOM components were used as ligands for the biding of heavy metal contaminants. Parallel factor analysis (PARAFAC) and variance partitioning analysis (VPA) was employed to analyze the complexing properties. Four DOM components were found in sewage sludge composting products. The identified DOM components in sewage sludge showed significant complexing ability with Zn, Cu and Cr, rather than Pb. Furthermore, based on VPA analysis, the heavy metal contaminants-binding contribution scores of each DOM components showed that simple structure DOM component C1 showed high Zn, Cu and Cr-binding ability. However, high humification degree DOM components presented high stability which could be employed for long-term heavy metals contaminants control. These promising findings provide valuable insights into the distinct binding properties of various DOM components with contaminants. This characterization serves as a theoretical foundation to support efforts in heavy metals control.

17. 题目: Insights into iron-induced structural changes in N-rich biochar for facilitating efficient organic pollutants removal by peroxymonosulfate activation: Cooperation of enrichment and degradation
文章编号: N24042004
期刊: Separation and Purification Technology
作者: Tianyu Wang, Ranran Zhao, Zhaowei Wang, Yaodong Wang, Wan Cheng, Kemin Qi, Xiaoyun Xie
更新时间: 2024-04-20
摘要: Naturally nitrogen in waste biomass can be turned into a valuable “treasure”. This work utilized soybean dregs as precursor, successfully fabricated iron-modified N-rich biochar (denoted as Fe-BDBC) catalysts via a green molten salt (KCl/NaCl) method. The physical and chemical changes of biochar substrate after iron modification were explored, combined Fenton-like reactions to establish structure–activity relationship between active sites and organic pollutants degradation. With iron induction, the hybrid structures of biochar could be transformed from to more easily, which enhanced its hydrophobicity and promoted interfacial electron-transfer efficiency. Pyridinic N and pyrrolic N structures were protected by the formation of Fe-N, which could participate in the formation of singlet oxygen (O) and catalyst-PMS*. Fe-BDBC/peroxymonosulfate (PMS) system achieved 100 % nonradical bisphenol A (BPA) removal by cooperation of surface-confined enrichment and degradation. The contributions of electron-transfer processes (ETP), O, and Fe(IV)=O were 58.3 %, 29.3 %, and 12.4 %, respectively. C=O/O-C=O, pyrrolic N, and Fe-N promoted O formation, C=C enhanced ETP, while pyridinic N played a dual role. The normalized apparent rate constant (, min × 10) was calculated to be 31.96, which was superior among biochar-derived catalysts. Fe-BDBC was loaded onto PVDF membrane for continuous and efficient degradation of BPA (nearly 100 % during 36 h operation). This work provided new insights for effective regulation of biochar-based catalysts.

18. 题目: Co-applied magnesium nanoparticles and biochar modulate salinity stress via regulating yield, biochemical attribute, and fatty acid profile of Physalis alkekengi L
文章编号: N24042003
期刊: Environmental Science and Pollution Research
作者: Zahra Amirfakhrian, Vahid Abdossi, Ali Mohammadi Torkashvand, Weria Weisany, Marzieh Ghanbari Jahromi
更新时间: 2024-04-20
摘要:

While previous studies have addressed the desirable effects of biochar (BC) or magnesium nanoparticles (Mg NPs) on salinity stress individually, there is a research gap regarding their simultaneous application. Additionally, the specific mechanisms underlying the effects of BC and Mg NPs on salinity in Physalis alkekengi L. remain unclear. This study aimed to investigate the synergistic effects of BC and Mg NPs on P. alkekengi L. under salinity stress conditions. A pot experiment was conducted with salinity at 100 and 200 mM sodium chloride (NaCl), as well as soil applied BC (4% v/v) and foliar applied Mg NPs (500 mg L−1) on physiological and biochemical properties of P. alkekengi L. The results represented that salinity, particularly 200 mM NaCl, significantly reduced plant yield (58%) and total chlorophyll (Chl, 36%), but increased superoxide dismutase (SOD, 82%) and catalase (CAT, 159%) activity relative to non-saline conditions. However, the co-application of BC and Mg NPs mitigated these negative effects and improved fruit yield, Chl, anthocyanin, and ascorbic acid. It also decreased the activity of antioxidant enzymes. Salinity also altered the fatty acid composition, increasing saturated fatty acids (SFAs) and polyunsaturated fatty acids (PUFAs), while decreasing monounsaturated fatty acids (MUFAs). The heat map analysis showed that fruit yield, anthocyanin, Chl, and CAT were sensitive to salinity. The findings can provide insights into the possibility of these amendments as sustainable strategies to mitigate salt stress and enhance plant productivity in affected areas.

19. 题目: Utilization of cotton byproduct-derived biochar: a review on soil remediation and carbon sequestration
文章编号: N24042002
期刊: Environmental Sciences Europe
作者: Yingru Tao, Weiying Feng, Zhongqi He, Beibei Wang, Fang Yang, Aainaa Izyan Nafsun, Yazhai Zhang
更新时间: 2024-04-20
摘要:

Biochar can improve soil health and fix CO2 by altering soil microenvironment, thus impacting the global carbon cycle and the change of soil ecological environment. Recent studies show that cotton byproduct-derived biochar is a potential effective amendment for soil improvement so that it could play an important role in agricultural and environmental conservation. In this work, research topics on cotton byproduct-derived biochar in soil in last decade and so are systematically reviewed for better understanding of the progresses of cotton byproduct-derived biochar in (i) the morphologic and physicochemical characterization, (ii) latest research hotspots and trends, (iii) the roles in soil reclamation, and (iv) relevant carbon sequestration mechanisms. Finally, the future research directions regarding cotton byproduct-derived biochar mingled to soil environment are discussed. Insight derived from this work would provide scientific basis for promoting more applications of cotton byproduct-derived biochar in soil ecological restoration and carbon fixation.

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20. 题目: Mechanisms of soil organic carbon and nitrogen stabilization in mineral associated organic matter – Insights from modelling in phase space
文章编号: N24042001
期刊: Biogeosciences
作者: Stefano Manzoni, Francesca Cotrufo
更新时间: 2024-04-20
摘要: . Understanding the mechanisms of plant-derived carbon (C) and nitrogen (N) transformation and stabilization in soil is fundamental for predicting soil capacity to mitigate climate change and support other soil functions. The decomposition of plant residues and particulate organic matter (POM) contributes to the formation of mineral associated (on average more stable) organic matter (MAOM) in soil. MAOM is formed from the binding of dissolved organic matter (ex vivo pathway) or microbial necromass and bioproducts (in vivo pathway) to minerals and metal colloids. Which of these two soil organic matter (SOM) stabilization pathways is more important and under which conditions remains an open question. To address this question, we propose a novel diagnostic model to describe C and N dynamics in MAOM as a function of the dynamics of residues and POM decomposition. Focusing on relations among soil compartments (i.e., modelling in phase space) rather than time trajectories allows isolating the fundamental processes underlying stabilization. Using this diagnostic model in combination with a database of ~ 40 studies in which residue C and N were tracked into POM and MAOM, we found that MAOM is predominantly fuelled by necromass produced by microbes decomposing residues and POM—the so-called ‘in vivo’ pathway of stabilization. The relevance of the in vivo pathway is higher in clayey soils, but lower in C rich soils and with N poor added residues. Overall, our novel modelling in phase space proved to be a sound diagnostic tool for the mechanistic investigation of soil C dynamics and supported the current understanding of the critical role of both microbial transformation and mineral capacity for the stabilization of C in mineral soils.

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