Journal of environmental sciences最新文献_第7页

A review on the transformation of birnessite in the environment: Implication for the stabilization of heavy metals 硼钼矿在环境中的转化研究进展:对重金属稳定的启示

IF 6.9

Journal of environmental sciences Pub Date : 2023-06-20 DOI: 10.1016/j.jes.2023.06.019

Miao Shi , Qingzhu Li , Qingwei Wang , Xuelei Yan , Bensheng Li , Linhai Feng , Chao Wu , Rongrong Qiu , Hongkai Zhang , Zhihui Yang , Weichun Yang , Qi Liao , Liyuan Chai

{"title":"A review on the transformation of birnessite in the environment: Implication for the stabilization of heavy metals","authors":"Miao Shi , Qingzhu Li , Qingwei Wang , Xuelei Yan , Bensheng Li , Linhai Feng , Chao Wu , Rongrong Qiu , Hongkai Zhang , Zhihui Yang , Weichun Yang , Qi Liao , Liyuan Chai","doi":"10.1016/j.jes.2023.06.019","DOIUrl":"https://doi.org/10.1016/j.jes.2023.06.019","url":null,"abstract":"<div><p>Birnessite is ubiquitous in the natural environment where heavy metals are retained and easily transformed. The surface properties and structure of birnessite change with the changes in external environmental conditions, which also affects the fate of heavy metals. Clarifying the effect and mechanism of the birnessite phase transition process on heavy metals is the key to taking effective measures to prevent and control heavy metal pollution. Therefore, the four transformation pathways of birnessite are summarized first in this review. Second, the relationship between transformation pathways and environmental conditions is proposed. These relevant environmental conditions include abiotic (e.g., co-existing ions, pH, oxygen pressure, temperature, electric field, light, aging, pressure) and biotic factors (e.g., microorganisms, biomolecules). The phase transformation is achieved by the key intermediate of Mn(III) through interlayer-condensation, folding, neutralization-disproportionation, and dissolution-recrystallization mechanisms. The AOS (average oxidation state) of Mn and interlayer spacing are closely correlated with the phase transformation of birnessite. Last but not least, the mechanisms of heavy metals immobilization in the transformation process of birnessite are summed up. They involve isomorphous substitution, redox, complexation, hydration/dehydration, etc. The transformation of birnessite and its implication on heavy metals will be helpful for understanding and predicting the behavior of heavy metals and the crucial phase of manganese oxides/hydroxides in natural and engineered environments.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"139 ","pages":"Pages 496-515"},"PeriodicalIF":6.9,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49764526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Controllable chemical redox reactions to couple microbial degradation for organic contaminated sites remediation: A review 可控化学氧化还原反应耦合微生物降解在有机污染场地修复中的研究进展

IF 6.9

Journal of environmental sciences Pub Date : 2023-06-20 DOI: 10.1016/j.jes.2023.06.012

Bin Chen , Jiang Xu , Lizhong Zhu

{"title":"Controllable chemical redox reactions to couple microbial degradation for organic contaminated sites remediation: A review","authors":"Bin Chen , Jiang Xu , Lizhong Zhu","doi":"10.1016/j.jes.2023.06.012","DOIUrl":"https://doi.org/10.1016/j.jes.2023.06.012","url":null,"abstract":"<div><p>Global environmental concern over organic contaminated sites has been progressively conspicuous during the process of urbanization and industrial restructuring. While traditional physical or chemical remediation technologies may significantly destroy the soil structure and function, coupling moderate chemical degradation with microbial remediation becomes a potential way for the green, economic, and efficient remediation of contaminated sites. Hence, this work systematically elucidates why and how to couple chemical technology with microbial remediation, mainly focused on the controllable redox reactions of organic contaminants. The rational design of materials structure, selective generation of reactive oxygen species, and estimation of degradation pathway are described for chemical oxidation. Meanwhile, current progress on efficient and selective reductions of organic contaminants (i.e., dechlorination, defluorination, -NO<sub>2</sub> reduction) is introduced. Combined with the microbial remediation of contaminated sites, several consideration factors of how to couple chemical and microbial remediation are proposed based on both fundamental and practical points of view. This review will advance the understanding and development of chemical-microbial coupled remediation for organic contaminated sites.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"139 ","pages":"Pages 428-445"},"PeriodicalIF":6.9,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49746628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Uncovering the coupling effect with energy-related carbon emissions and human development variety in Chinese provinces 中国省区能源相关碳排放与人类发展变化的耦合效应

IF 6.9

Journal of environmental sciences Pub Date : 2023-06-12 DOI: 10.1016/j.jes.2023.05.046

Liu Chen , Yiqi Tan , Gengpei Lv , Weiguang Cai , Xiaofeng Gao , Rui Li

{"title":"Uncovering the coupling effect with energy-related carbon emissions and human development variety in Chinese provinces","authors":"Liu Chen , Yiqi Tan , Gengpei Lv , Weiguang Cai , Xiaofeng Gao , Rui Li","doi":"10.1016/j.jes.2023.05.046","DOIUrl":"https://doi.org/10.1016/j.jes.2023.05.046","url":null,"abstract":"<div><p>Lessening energy-related carbon emissions has become a crucial measure to achieve Chinese carbon neutrality. This study is the first to construct a Difference in Carbon pressures-adjusted Human Development Index (DCHDI) model for the purpose of exploring the coupling effect between carbon emissions and human development variety from 2000 to 2019 in Chinese provinces. We demonstrate the following. (1) The total energy-related carbon footprint of 30 provinces in China reached 10.2 billion tons in 2019, with an average annual growth rate of 6.93% over the past two decades; and the provinces with the highest carbon emissions per capita are InnerMongolia, Ningxia, and Shanxi. (2) At the provincial level, we observed that the Human Development Index (HDI), which includes life expectancy, education, and income, has been rising, while Beijing, Shanghai, and Tianjin entered the super-high HDI level before 2008. (3) The entire coupling effect of 30 Chinese provinces has been broadly fortified in the last 20 years, but the growth rate of DCHDI values in 2011–2019 has slowed down compared with that in 2000–2010; the clustering phenomenon demonstrated that this discovery is associated with historical peaks in total carbon emissions. (4) The coordination degree of carbon emissions per capita and HDI was verified, and 96% of the data points were found in the range of super high coupling coordination degree. Overall, this study provides the government with worthwhile guidance for decision-making and carbon reduction strategies for other countries struggling to advance human sustainable development.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"139 ","pages":"Pages 527-542"},"PeriodicalIF":6.9,"publicationDate":"2023-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49764531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Feasibility of low-intensity ultrasound treatment with hydroxylamine to accelerate the initiation of partial nitrification and allow operation under intermittent aeration 低强度超声羟胺治疗加速部分硝化启动和间歇曝气操作的可行性

IF 6.9

Journal of environmental sciences Pub Date : 2023-06-10 DOI: 10.1016/j.jes.2023.06.003

Jianxiong Jian , Xiaojian Liao , Zhihua Mo , Shoupeng Li , Lei Li , Shaojin Chen , Zhenhua Huang , Junhao Chen , Wencan Dai , Shuiyu Sun

{"title":"Feasibility of low-intensity ultrasound treatment with hydroxylamine to accelerate the initiation of partial nitrification and allow operation under intermittent aeration","authors":"Jianxiong Jian , Xiaojian Liao , Zhihua Mo , Shoupeng Li , Lei Li , Shaojin Chen , Zhenhua Huang , Junhao Chen , Wencan Dai , Shuiyu Sun","doi":"10.1016/j.jes.2023.06.003","DOIUrl":"https://doi.org/10.1016/j.jes.2023.06.003","url":null,"abstract":"<div><p>Partial nitrification is a key aspect of efficient nitrogen removal, although practically it suffers from long start-up cycles and unstable long-term operational performance. To address these drawbacks, this study investigated the effect of low intensity ultrasound treatment combined with hydroxylamine (NH<sub>2</sub>OH) on the performance of partial nitrification. Results show that compared with the control group, low-intensity ultrasound treatment (0.10 W/mL, 15 min) combined with NH<sub>2</sub>OH (5 mg/L) reduced the time required for partial nitrification initiation by 6 days, increasing the nitrite accumulation rate (NAR) and ammonia nitrogen removal rate (NRR) by 20.4% and 6.7%, respectively, achieving 96.48% NRR. Mechanistic analysis showed that NH<sub>2</sub>OH enhanced ammonia oxidation, inhibited nitrite-oxidizing bacteria (NOB) activity and shortened the time required for partial nitrification initiation. Furthermore, ultrasonication combined with NH<sub>2</sub>OH dosing stimulated EPS (extracellular polymeric substances) secretion, increased carbonyl, hydroxyl and amine functional group abundances and enhanced mass transfer. In addition, 16S rRNA gene sequencing results showed that ultrasonication-sensitive <em>Nitrospira</em> disappeared from the ultrasound + NH<sub>2</sub>OH system, while <em>Nitrosomonas</em> gradually became the dominant group. Collectively, the results of this study provide valuable insight into the enhancement of partial nitrification start-up during the process of wastewater nitrogen removal.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"139 ","pages":"Pages 446-459"},"PeriodicalIF":6.9,"publicationDate":"2023-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49746638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Significant contribution of carbonyls to atmospheric oxidation capacity (AOC) during the winter haze pollution over North China Plain 华北平原冬季雾霾污染期间羰基对大气氧化能力的显著贡献

IF 6.9

Journal of environmental sciences Pub Date : 2023-06-09 DOI: 10.1016/j.jes.2023.06.004

Xue Yang , Gen Zhang , Guang Pan , Guolan Fan , Houyong Zhang , Xuan Ge , Mingyue Du

{"title":"Significant contribution of carbonyls to atmospheric oxidation capacity (AOC) during the winter haze pollution over North China Plain","authors":"Xue Yang , Gen Zhang , Guang Pan , Guolan Fan , Houyong Zhang , Xuan Ge , Mingyue Du","doi":"10.1016/j.jes.2023.06.004","DOIUrl":"https://doi.org/10.1016/j.jes.2023.06.004","url":null,"abstract":"<div><p><span>Atmospheric carbonyl compounds<span> play significant roles in the cycling of radicals and have exhibited surprisingly high levels in winter that were well correlated to particulate matter, for which the reason have not been clearly elucidated. Here we measured carbonyl compounds and other trace gasses together with PM</span></span><sub>2.5</sub> over urban Jinan in North China Plain during the winter. Markedly higher carbonyl concentrations (average: 14.63 ± 4.21 ppbv) were found during wintertime haze pollution, about one to three-times relative to those on non-haze days, with slight difference in chemical composition except formaldehyde (HCHO). HCHO (3.68 ppbv), acetone (3.17 ppbv), and acetaldehyde (CH<sub>3</sub>CHO) (2.83 ppbv) were the three most abundant species, accounting for ∼75% of the total carbonylson both haze and non-haze days. Results from observational-based model (OBM) with atmospheric oxidation capacity (AOC) indicated that AOC significantly increased with the increasing carbonyls during the winter haze events. Carbonyl photolysis have supplied key oxidants such as RO<sub>2</sub> and HO<sub>2</sub>, and thereby enhancing the formation of fine particles and secondary organic aerosols, elucidating the observed haze-carbonyls inter-correlation. Diurnal variation with carbonyls exhibiting peak values at early-noon and night highlighted the combined contribution of both secondary formation and primary diesel-fuel sources. 1-butene was further confirmed to be the major precursor for HCHO. This study confirms the great contribution of carbonyls to AOC, and also suggests that reducing the emissions of carbonyls would be an effective way to mitigate haze pollution in urban area of the NCP region.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"139 ","pages":"Pages 377-388"},"PeriodicalIF":6.9,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49746328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluating the performance and influencing factors of three portable black carbon monitors for field measurement 评价三种便携式野外测量黑碳监测仪的性能及影响因素

IF 6.9

Journal of environmental sciences Pub Date : 2023-06-07 DOI: 10.1016/j.jes.2023.05.044

Liqing Wu , Yicheng Shen , Fei Che , Yuzhe Zhang , Jian Gao , Chong Wang

{"title":"Evaluating the performance and influencing factors of three portable black carbon monitors for field measurement","authors":"Liqing Wu , Yicheng Shen , Fei Che , Yuzhe Zhang , Jian Gao , Chong Wang","doi":"10.1016/j.jes.2023.05.044","DOIUrl":"https://doi.org/10.1016/j.jes.2023.05.044","url":null,"abstract":"<div><p><span><span>Black carbon (BC) is associated with adverse human health and climate change. Mapping BC spatial distribution imperatively requires low-cost and portable devices. Several portable BC monitors are commercially available, but their accuracy and reliability are not always satisfactory during continuous field observation. This study evaluated three models of portable black carbon monitors, C12, MA350 and DST, and investigates the factors that affect their performance. The monitors were tested in urban Beijing, where portable devices running for one month alongside a regular-size reference aethalometer AE33. The study considers several factors that could influence the monitors' performance, including ambient weather, </span>aerosol composition, loading artifacts, and built-in algorithms. The results show that MA350 and DST present considerable discrepancies to the reference instrument, mainly occurring at lower concentrations (0–500 ng/m</span><sup>3</sup>) and higher concentrations (2500–8000 ng/m<sup>3</sup>), respectively. These discrepancies were likely caused by the anomalous noise of MA350 and the loading artifacts of DST. The study also suggests that the ambient environment has limited influence on the monitors' performance, but loading artifacts and accompanying compensation algorithms can result in unrealistic data. Based on the evaluation, the study suggests that C12 is the best choice for unsupervised field measurement, DST should be used in scenarios where frequent maintenance is available, and MA350 is suitable for research purposes with post-processing applicable. The study highlights the importance of assigning portable BC monitors to appropriate applications and the need for optimized real-time compensation algorithms.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"139 ","pages":"Pages 320-333"},"PeriodicalIF":6.9,"publicationDate":"2023-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49746743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dissolved organic matter accelerates microbial degradation of 17 alpha-ethinylestradiol in the presence of iron mineral 在铁矿物存在的情况下，溶解的有机物加速了17 α -炔雌醇的微生物降解

IF 6.9

Journal of environmental sciences Pub Date : 2023-06-07 DOI: 10.1016/j.jes.2023.05.042

Huan He , Min Shi , Xiaoxia Yang , Juhong Zhan , Yanting Lin , Ziwei Guo , Zhicheng Liao , Chaochao Lai , Xiaomin Ren , Bin Huang , Xuejun Pan

{"title":"Dissolved organic matter accelerates microbial degradation of 17 alpha-ethinylestradiol in the presence of iron mineral","authors":"Huan He , Min Shi , Xiaoxia Yang , Juhong Zhan , Yanting Lin , Ziwei Guo , Zhicheng Liao , Chaochao Lai , Xiaomin Ren , Bin Huang , Xuejun Pan","doi":"10.1016/j.jes.2023.05.042","DOIUrl":"https://doi.org/10.1016/j.jes.2023.05.042","url":null,"abstract":"<div><p>Dissolved organic matter (DOM) and iron minerals widely existing in the natural aquatic environment can mediate the migration and transformation of organic pollutants. However, the mechanism of interaction between DOM and iron minerals in the microbial degradation of pollutants deserves further investigation. In this study, the mechanism of 17 alpha-ethinylestradiol (EE2) biodegradation mediated by humic acid (HA) and three kinds of iron minerals (goethite, magnetite, and pyrite) was investigated. The results found that HA and iron minerals significantly accelerated the biodegradation process of EE2, and the highest degradation efficiency of EE2 (48%) was observed in the HA-mediated microbial system with pyrite under aerobic conditions. Furthermore, it had been demonstrated that hydroxyl radicals (HO•) was the main active substance responsible for the microbial degradation of EE2. HO• is primarily generated through the reaction between hydrogen peroxide secreted by microorganisms and Fe(II), with aerobic conditions being more conducive. The presence of iron minerals and HA could change the microbial communities in the EE2 biodegradation system. These findings provide new information for exploring the migration and transformation of pollutants by microorganisms in iron-rich environments.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"139 ","pages":"Pages 364-376"},"PeriodicalIF":6.9,"publicationDate":"2023-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49757715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Artificial intelligence optimization and controllable slow-release iron sulfide realizes efficient separation of copper and arsenic in strongly acidic wastewater 人工智能优化和可控缓释硫化铁实现了强酸性废水中铜砷的高效分离

IF 6.9

Journal of environmental sciences Pub Date : 2023-06-07 DOI: 10.1016/j.jes.2023.05.038

Xingfei Zhang , Chenglong Lu , Jia Tian , Liqiang Zeng , Yufeng Wang , Wei Sun , Haisheng Han , Jianhua Kang

{"title":"Artificial intelligence optimization and controllable slow-release iron sulfide realizes efficient separation of copper and arsenic in strongly acidic wastewater","authors":"Xingfei Zhang , Chenglong Lu , Jia Tian , Liqiang Zeng , Yufeng Wang , Wei Sun , Haisheng Han , Jianhua Kang","doi":"10.1016/j.jes.2023.05.038","DOIUrl":"https://doi.org/10.1016/j.jes.2023.05.038","url":null,"abstract":"<div><p>Iron sulfide (FeS) is a promising material for separating copper and arsenic from strongly acidic wastewater due to its S<sup>2−</sup> slow-release effect. However, uncertainties arise because of the constant changes in wastewater composition, affecting the selection of operating parameters and FeS types. In this study, the aging method was first used to prepare various controllable FeS nanoparticles to weaken the arsenic removal ability without affecting the copper removal. Orthogonal experiments were conducted, and the results identified the Cu/As ratio, H<sub>2</sub>SO<sub>4</sub> concentration, and FeS dosage as the three main factors influencing the separation efficiency. The backpropagation artificial neural network (BP-ANN) model was established to determine the relationship between the influencing factors and the separation efficiency. The correlation coefficient (R) of overall model was 0.9923 after optimizing using genetic algorithm (GA). The BP-GA model was also solved using GA under specific constraints, predicting the best solution for the separation process in real-time. The predicted results show that the high temperature and long aging time of FeS were necessary to gain high separation efficiency, and the maximum separation factor can reached 1,400. This study provides a suitable sulfurizing material and a set of methods and models with robust flexibility that can successfully predict the separation efficiency of copper and arsenic from highly acidic environments.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"139 ","pages":"Pages 293-307"},"PeriodicalIF":6.9,"publicationDate":"2023-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49757711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanistic insight into Cr(VI) retention by Si-containing ferrihydrite 含硅水合铁对Cr(VI)截留的机理研究

IF 6.9

Journal of environmental sciences Pub Date : 2023-06-03 DOI: 10.1016/j.jes.2023.05.040

Ying Hu , Qiang Xue , Honghan Chen , Huaming Guo , Kenneth C. Carroll , Song Wang

{"title":"Mechanistic insight into Cr(VI) retention by Si-containing ferrihydrite","authors":"Ying Hu , Qiang Xue , Honghan Chen , Huaming Guo , Kenneth C. Carroll , Song Wang","doi":"10.1016/j.jes.2023.05.040","DOIUrl":"https://doi.org/10.1016/j.jes.2023.05.040","url":null,"abstract":"<div><p>Hexavalent chromium [Cr(VI)] causes serious harm to the environment due to its high toxicity, solubility, and mobility. Ferrihydrites (Fh) are the main adsorbent and trapping agent of Cr(VI) in soils and aquifers, and they usually coexist with silicate (Si), forming Si-containing ferrihydrite (Si-Fh) mixtures. However, the mechanism of Cr(VI) retention by Si-Fh mixtures is poorly understood. In this study, the behaviors and mechanisms of Cr(VI) adsorption onto Si-Fh with different Si/Fe molar ratios was investigated. Transmission electron microscope, Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and other techniques were used to characterize Si-Fh and Cr(VI)-loading of Si-Fh. The results show that specific surface area of Si-Fh increases gradually with increasing Si/Fe ratios, but Cr(VI) adsorption on Si-Fh decreases with increasing Si/Fe ratios. This is because with an increase in Si/Fe molar ratio, the point of zero charge of Si-Fh gradually decreases and electrostatic repulsion between Si-Fh and Cr(VI) increases. However, the complexation of Cr(VI) is enhanced due to the increase in adsorbed hydroxyl (A-OH-) on Si-Fh with increasing Si/Fe molar ratio, which partly counteracts the effect of the electrostatic repulsion. Overall, the increase in the electrostatic repulsion has a greater impact on adsorption than the additional complexation with Si-Fh. Density functional theory calculation further supports this observation, showing the increases in electron variation of bonding atoms and reaction energies of inner spherical complexes with the increase in Si/Fe ratio.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"139 ","pages":"Pages 217-225"},"PeriodicalIF":6.9,"publicationDate":"2023-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49746556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Performance and mechanism of La-Fe metal-organic framework as a highly efficient adsorbent for fluoride removal from mine water La-Fe金属有机骨架高效吸附剂对矿井水中氟化物的吸附性能及机理研究

IF 6.9

Journal of environmental sciences Pub Date : 2023-06-03 DOI: 10.1016/j.jes.2023.05.039

Chaomin Jia , Jianbing Wang , Huijiao Wang , Sichao Zhu , Xiaohui Zhang , Yuxiang Wang

{"title":"Performance and mechanism of La-Fe metal-organic framework as a highly efficient adsorbent for fluoride removal from mine water","authors":"Chaomin Jia , Jianbing Wang , Huijiao Wang , Sichao Zhu , Xiaohui Zhang , Yuxiang Wang","doi":"10.1016/j.jes.2023.05.039","DOIUrl":"https://doi.org/10.1016/j.jes.2023.05.039","url":null,"abstract":"<div><p>Water fluoride pollution has caused non-negligible harm to the environment and humans, and thus it is crucial to find a suitable treatment technology. In this study, La-Fe@PTA adsorbent was synthesized for the defluoridation of mine water. The results showed that the optimum conditions for defluoridation by La-Fe@PTA were pH close to 7.0, the initial F<sup>−</sup> concentration of 10 mg/L, the dosage of 0.5 g/L and the adsorption time of 240 min. Compared with SO<sub>4</sub><sup>2‒</sup>, Cl<sup>‒</sup>, NO<sub>3</sub><sup>‒</sup>, Ca<sup>2+</sup> and Mg<sup>2+</sup>, CO<sub>3</sub><sup>2‒</sup> and HCO<sub>3</sub><sup>‒</sup> presented severer inhibition on fluoride uptake by La-Fe@PTA. The adsorption process fits well with the pseudo-second-order kinetic model and Freundlich model, and the maximum adsorption capacity of Langmuir model was 95 mg/g. Fixed-bed adsorption results indicated that fluoride in practical fluorinated mine water could be effectively removed from 3.6 mg/L to less than 1.5 mg/L within 130 bed volume (BV) by using 1.5 g La-Fe@PTA. Furthermore, the adsorbent still had good adsorption capacity after regeneration, which confirms the great application potential of La-Fe@PTA as a fluoride ion adsorbent. The mechanism analysis showed that La-Fe@PTA adsorption of fluorine ions is a physicochemical reaction driven by electrostatic attraction and ion exchange.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"139 ","pages":"Pages 245-257"},"PeriodicalIF":6.9,"publicationDate":"2023-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49745975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1