环境•农林最新文献

{"title":"Ecotoxicological Evaluation of Paint Industrial Effluent Post-Treated with Fenton-Type Coagulation","authors":"Thayrine Dias Carlos,&nbsp;Rone Silva Barbosa,&nbsp;Angelo Pallini,&nbsp;Grasiele Soares Cavallini,&nbsp;Renato Almeida Sarmento","doi":"10.1007/s11270-024-07620-5","DOIUrl":"10.1007/s11270-024-07620-5","url":null,"abstract":"<div><p>Effluents from the paint industry released into water bodies without treatment contain a large load of organic matter, metals, suspended solids, and pigments that are responsible for the contamination of aquatic ecosystems. Therefore, in addition to conventional treatment processes, advanced processes are needed to reduce harmful effects on the environment, with advanced oxidative processes (AOPs) being an alternative for treating these wastewaters. Fenton-type coagulation is a combination of the coagulation process and Fenton-type (AOP) that replaces traditional reagents (H₂O₂ + Fe²⁺) with peracetic acid + Fe³⁺ in the attempt at reduced toxicity and improved efficiency in the removal of contaminants. This study aimed to obtain ecotoxicological data on effluents from the paint industry, raw and post-treated with Fenton-type coagulation, using the planarian species <i>Girardia tigrina</i> as a bioindicator of contamination. The acute toxicity bioassay results were not statistically significant. Chronic toxicity tests demonstrated few toxic effects on organisms exposed to the treated effluent. The locomotion of the planarians was reduced in the raw effluent. Exposure to raw effluent also negatively affected the development and reproductive parameters of the organisms, resulting in delayed regeneration of the blastema, photoreceptors, and auricles, in addition to a reduction in the number of cocoons and fertility, which did not occur when planarians were exposed to the treated effluent. The results showed that treating paint effluent with Fenton-type coagulation reduces effluent toxicity.</p></div>","PeriodicalId":808,"journal":{"name":"Water, Air, & Soil Pollution","volume":"236 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142694812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Combating Lead (Pb) Contamination: Integrating Biomonitoring, Advanced Detection, and Remediation for Environmental and Public Health","authors":"Saima Zafar,&nbsp;Sehrish Fatima,&nbsp;Farkhanda Asad,&nbsp;Muhammad Muzammil Nazir,&nbsp;Sania Batool,&nbsp;Asma Ashraf","doi":"10.1007/s11270-024-07646-9","DOIUrl":"10.1007/s11270-024-07646-9","url":null,"abstract":"<div><p>Heavy metal contamination, particularly lead (Pb), causes serious global health problems. The industrial use of Pb has resulted in broad environmental contamination and severe toxicity, including neurological illnesses, developmental problems in children, and chronic diseases. Natural processes as well as human activity such as smelting and battery production are major causes of Pb contamination. Children and pregnant women are especially vulnerable to Pb exposure, which has a wide-ranging impact on many organ systems. Recent advances in detection, such as atomic spectrometry and GIS, as well as remediation technologies, such as nanotechnology and artificial intelligence, have enhanced monitoring and mitigation of lead contamination. Biomonitoring employing biological indicators, as well as identifying biomarkers of exposure, effect, and susceptibility, are critical for developing tailored therapies to reduce Pb harm. Furthermore, biomonitoring and environmental monitoring are critical in finding the most effective remediation procedures. While current physical repair procedures are successful, they are frequently expensive and complicated. Microbe-based remediation is a potential, low-maintenance option. This review emphasizes interdisciplinary collaboration to defend against Pb contamination by leading remediation activities with precise biomonitoring and proposing management solutions. It incorporates recent improvements in monitoring and remediation technology, resulting in a strong foundation for efficiently addressing Pb exposure. These activities are intended to reduce dangers, protect human health, and assure environmental safety for future generations.</p></div>","PeriodicalId":808,"journal":{"name":"Water, Air, & Soil Pollution","volume":"236 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142694770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New Insights into the Effects of Polystyrene Microplastics on Freshwater Fish, Labeo rohita: Assessment on Histopathology, Mineral Composition, Bioaccumulation and Antioxidant Activity","authors":"Eram Rashid,&nbsp;Syed Makhdoom Hussain,&nbsp;Shafaqat Ali,&nbsp;Pallab K. Sarker,&nbsp;Shabab Nasir,&nbsp;Khalid Mashay Al-Anazi,&nbsp;Nadia Nazish","doi":"10.1007/s11270-024-07643-y","DOIUrl":"10.1007/s11270-024-07643-y","url":null,"abstract":"<div><p>Microplastics (MPs) have become a pressing concern due to their pervasive presence in the environment and bioaccumulation in fish organs, potentially threatening ecosystem health. This study examined the impact of polystyrene (PS) MPs on <i>Labeo rohita</i> fingerlings (7.15 ± 0.02 g/fish) by exploring histopathological changes in intestine, altered mineral composition in muscles, bioaccumulation and modulated antioxidant enzyme activity. This study utilized six test diets comprising sunflower meal with varying polystyrene microplastic (PS-MP) levels. The control diet (I) contained 0% PS-MPs, while diets II-VI had 0.5%, 1%, 1.5%, 2%, and 2.5% PS-MPs, respectively, over a 90-day feeding trial. The fish were fed their respective test diets twice daily with a feeding rate of 5% wet body weight per day. The findings elucidated that the antioxidant enzyme activity and bioaccumulation were substantially altered by increased PS-MPs exposure. Moreover, histopathology examination revealed intestinal structural abnormalities, which worsened with escalating PS-MPs concentrations. Notably, test diet VI (2.5% PS-MPs) showed lower mineral content (<i>P</i> &lt; 0.05) in fingerlings muscles when compared with control. In conclusion, results indicate that PS-MPs may negatively impact the <i>L. rohita</i> fingerlings, affecting histopathology of intestine, mineral composition, bioaccumulation, and antioxidant enzyme function.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":808,"journal":{"name":"Water, Air, & Soil Pollution","volume":"236 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142694780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of Influent Load on Nitrification/Denitrification with MBBR for Oil Shale Retorting Wastewater Treatment: Performance and Microbial Community Structure","authors":"Rong-xin Zhang,&nbsp;Yi Liu,&nbsp;Dian-nan Huang,&nbsp;Li Zhang,&nbsp;Xing-guan Ma,&nbsp;Peng-fei Yu,&nbsp;Chuang Liu,&nbsp;Yong-yong Wang","doi":"10.1007/s11270-024-07615-2","DOIUrl":"10.1007/s11270-024-07615-2","url":null,"abstract":"<div><p>Oil shale retorting wastewater is currently recognized as one of the most complex industrial wastewater due to its ultra-low chemical oxygen demand to total nitrogen (C/N) ratio, high organic load, and complex chemical composition. In this paper, the effect of influent load on the performance and microbial community changes of moving bed biofilm reactor(MBBR) in the treatment of highly polluted retorting wastewater was investigated. The MBBR was proposed and demonstrated to be efficient in treating the retorting wastewater, containing COD and NH₄⁺-N of 5000-10000mg/L and 3000-5000mg/L. The removal efficiency of COD and NH₄⁺-N increased steadily in 1-79d, and the effect was the best when the influent load was 0.0242–0.0312kg COD/kg MLSS·d and 0.0173–0.0208kg NH₄⁺-N/kg MLSS·d. The removal efficiency of COD was up to 83.46%, and the removal efficiency of NH₄⁺-N was 82.08%. The long-term operation showed that the biofilm could be rapidly formed after 40 days. Scanning electron microscope observation showed that cocci and short bacilli appeared in the pores of the fillers. With the increase of influent load, the total amount of extracellular polymeric substances increased significantly, in which the content of protein increased sharply in stage III, while the polysaccharide was in a state of continuous and stable growth. High-throughput sequencing analysis showed that the nitrifying functional genus Nitrosomonas was highly enriched in the MBBR system (0 → 17.55%) and played a key role in the high accumulation of NO₃⁻-N. The newly added denitrifying bacteria <i>Brevundimonas</i> (5.85%) and <i>Reyranella</i> (4.57%) enhanced the degradation of COD and maintained the nitrogen cycle in the system. The enrichment of <i>Acinetobacter</i>, <i>Rugosibacter</i>, and <i>unclassified_Syntrophobacteraceae</i> in the system played an important role in the degradation of complex organic compounds such as polycyclic aromatic hydrocarbons and aromatic compounds.</p></div>","PeriodicalId":808,"journal":{"name":"Water, Air, & Soil Pollution","volume":"236 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142694716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Habitability for a connected, unequal and changing world","authors":"Harald Sterly ,&nbsp;Marion Borderon ,&nbsp;Patrick Sakdapolrak ,&nbsp;Neil Adger ,&nbsp;Ayansina Ayanlade ,&nbsp;Alassane Bah ,&nbsp;Julia Blocher ,&nbsp;Suzy Blondin ,&nbsp;Sidy Boly ,&nbsp;Timothée Brochier ,&nbsp;Loïc Brüning ,&nbsp;Simon Bunchuay-Peth ,&nbsp;David O’Byrne ,&nbsp;Ricardo Safra De Campos ,&nbsp;Samuel Nii Ardey Codjoe ,&nbsp;Florian Debève ,&nbsp;Adrien Detges ,&nbsp;Maria Franco-Gavonel ,&nbsp;Claire Hathaway ,&nbsp;Nikki Funke ,&nbsp;Caroline Zickgraf","doi":"10.1016/j.gloenvcha.2024.102953","DOIUrl":"10.1016/j.gloenvcha.2024.102953","url":null,"abstract":"<div><div>As global climate change intensifies, the question of what makes a place habitable or uninhabitable is critical, particularly in the context of a potential future climate outside the realm of lived experience, and the possible concurrent redistribution of populations partly associated with such climatic shifts. The concept of habitability holds the potential for advancing the understanding of the societal consequences of climate change, as well as for integrating systemic understandings and rights-based approaches. However, most ways of analyzing habitability have shortcomings in terms of in-depth integration of socio-cultural aspects and human agency in shaping habitability, in failing to address spatial inequalities and power dynamics, and in an underemphasis of the connectedness of places. Here we elaborate habitability as an emergent property of the relations between people and a given place that results from people’s interactions with the material and immaterial properties of a place. From this, we identify four axes that are necessary to go beyond environmental changes, and to encompass socio-cultural, economic, and political dynamics: First the processes that influence habitability require a systemic approach, viewing habitability as an outcome of ecological, economic, and political processes. Second, the role of socio-cultural dimensions of habitability requires special consideration, given their own operational logics and functioning of social systems. Third, habitability is not the same for everyone, thus a comprehensive understanding of habitability requires an intersectionally differentiated view on social inequalities. Forth, the influence of external factors necessitates a spatially relational perspective on places in the context of their connections to distant places across scales. We identify key principles that should guide an equitable and responsible research agenda on habitability. Analysis should be based on disciplinary and methodological pluralism and the inclusion of local perspectives. Habitability action should integrate local perspectives with measures that go beyond purely subjective assessments. And habitability should consider the role of powerful actors, while staying engaged with ethical questions of who defines and enacts the future of any given place.</div></div>","PeriodicalId":328,"journal":{"name":"Global Environmental Change","volume":"90 ","pages":"Article 102953"},"PeriodicalIF":8.6,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142698109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Complete degradation of 2,4-dichlorophenol in sequential sulfidated nanoscale zero-valent iron/peroxydisulfate system: Dechlorination, mineralization and mechanism","authors":"Zhoujie Pi, Puyu Zhou, Kun Luo, Li He, Shengjie Chen, Zhu Wang, Shanshan Zhang, Xiaoming Li, Qi Yang","doi":"10.1039/d4en00737a","DOIUrl":"https://doi.org/10.1039/d4en00737a","url":null,"abstract":"Chlorophenols (CPs) have strong toxicity because of the presence of chlorine atom. Although the dechlorination can eliminate their toxicity, by-product organics maybe bring secondary pollution. In this study, a two-step process of pre-reduction dechlorination and oxidation, reductive dechlorination by sulfidated nanoscale zero-valent iron (S-nZVI) and advanced oxidation by S-nZVI-activated peroxydisulfate (PDS), was innovatively adopted to achieve efficient and complete mineralization of 2,4-dichlorophenol (2,4-DCP). The pre-reduction of S-nZVI achieved 80% dechlorination of 2,4-DCP. With the subsequent addition of PDS, 2,4-DCP and its dechlorination by-products in solution was almost completely removed and the mineralization rate reached to 91.5% under the optimal conditions of unadjusted initial pH (5.4), S-nZVI dosage 2.5 g·L-1, and PDS concentration 1.8 mM. The electron spin resonance (ESR) and radical quenching experiments demonstrated that both ·OH and SO4·- were involved in the degradation of 2,4-DCP, while SO4·- played the more predominate role. Based on the transformation products of 2,4-DCP identified by GC-MS, the degradation mechanism of 2,4-DCP in this system included two steps, namely, reductive dechlorination induced by electrons transformation and oxidation degradation involving single electron transfer, radical adduct formation, and hydrogen atom abstraction. This study demonstrated that the noval S-nZVI pre-reduction and sequential S-nZVI/PDS process is a very promising and efficient approach for complete removal of CPs in water.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"20 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142690955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of Irrigation with Contaminated River Water on Growth, Yield, and Heavy Metals Accumulation in Planted Armenian Cucumber (Cucumis melo var. flexuosus (L.) Naudin.)","authors":"Pankaj Kumar,&nbsp;Sadeq K. Alhag,&nbsp;Eman A. Al-Shahari,&nbsp;Maged S. Al-Fakeh,&nbsp;Sami Abou Fayssal,&nbsp;Rakesh Kumar Bachheti,&nbsp;Ivan Širić,&nbsp;Ebrahem M. Eid","doi":"10.1007/s11270-024-07642-z","DOIUrl":"10.1007/s11270-024-07642-z","url":null,"abstract":"<div><p>Cultivation of horticultural crops in riverbank soils which are enriched by deposition of nutrient-rich sediments is one of the most common practices in arid and semi-arid regions around the globe. However, contamination of river streams by urban, industrial, and agricultural runoffs resulted in the accumulation of excessive levels of certain nutrients and heavy metals in such crops. Keeping in view, the present study was conducted to understand the impact of Yamuna (non-contaminated) and Solani (urban sewage contaminated) Rivers streams on riverbank soils and planted Armenian cucumber [<i>Cucumis melo</i> var. <i>flexuosus</i> (L.) Naudin.] in a two-year (2022 and 2023) study. The results showed that <i>C. melo</i> cultivated in Solani River water irrigated soils had significantly (<i>p</i> &lt; 0.05) higher growth, yield, and biochemical constitutes as compared to Yamuna River water irrigated soils. The bioaccumulation factor (BAF) studies showed that concentrations of eight heavy metals (Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn) were higher in <i>C. melo</i> grown in Solani River soils. However, the levels of heavy metals were found below the safe limits as indicated by dietary intake of metal (DIM), health risk index (HRI &lt; 1), and target hazard quotient (THQ &lt; 1) indices. Overall, this study evidenced that river water impacted by urban sewage could result in elevated levels of heavy metals in river water, soil, and cultivated food crops, thus, signifying their regular biomonitoring in order to mitigate any associated health risk.</p></div>","PeriodicalId":808,"journal":{"name":"Water, Air, & Soil Pollution","volume":"236 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of Fenton-like reaction pathways using Ov-containing ZnO@nitrogen-rich porous carbon: the electron transfer and 1O2 triggered non-radical process","authors":"Zhenfeng Zhang, Tianli Xiong, Haihao Peng, Honglin Zhang, Siying He, Xuran Liu, Yanan Liu, Wenyi Feng, Zhaohui Yang, Weiping Xiong","doi":"10.1039/d4en00749b","DOIUrl":"https://doi.org/10.1039/d4en00749b","url":null,"abstract":"With the development of persulfate-based Fenton-like catalysis, how to control the PDS reaction pathway is a great challenge. Herein, we prepared catalysts with nitrogen-rich porous carbon (NPC) layers and oxygen vacancy (O<small>_v</small>) sites for PDS activation to degrade sulfamethazine (SMZ). Results revealed that the ZnO@NPC/PDS system exhibited only non-radical pathways, which comprised the singlet oxygen (<small>¹</small>O<small>₂</small>) and electron transfer process. The intrinsic mechanism underlying the production of active species was further verified by comparing the results of the ZnO@NPC/PDS and ZnO@NPC-Etch/PDS systems, Raman analysis and DFT calculations. Adsorption of PDS by carbon layers resulted in the formation of a catalyst–PDS complex, which not only elongated the S–O bond and accelerated the decomposition of PDS to generate <small>¹</small>O<small>₂</small> but also provided access for electron transfer. Meanwhile, O<small>_v</small> sites increased electron density and electron migration strength, which promoted more electron transfer from O<small>_v</small>s to PDS molecules through nitrogen-rich porous carbon layers. Moreover, the ZnO@NPC/PDS system could maintain a degradation rate of &gt;90% for SMZ in real water matrixes. T. E. S. T software prediction and toxicity tests were used to investigate environmental implications of degradation intermediates, which showed reduced ecological toxicity compared with SMZ. This work fabricated the ZnO@NPC/PDS system and explored the interaction between nitrogen-rich porous carbon layers and O<small>_v</small> to regulate the occurrence of non-radical pathways, which could provide a strategy to control the PDS reaction pathway.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"129 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Salt-Resistant Catalyst Fe-Bi@γ-Al2O3 for Catalytic Ozonation of High-Salt Simulated Wastewater","authors":"Lei Guo,&nbsp;Xingwang Yang,&nbsp;Yanhua Xu,&nbsp;Jun Zhou,&nbsp;Wenquan Sun,&nbsp;Yongjun Sun","doi":"10.1007/s11270-024-07652-x","DOIUrl":"10.1007/s11270-024-07652-x","url":null,"abstract":"<div><p>In order to study the effects of common ionic components in wastewater on the catalytic performance and salt resistance of the Fe-Bi@γ-Al₂O₃ catalyst, hydroquinone was selected as the target organic pollutant. Five factors, namely cation species, anion species, total hardness, total alkalinity, and TDS were studied to investigate the effects of different ionic components on the degradation of hydroquinone by the Fe-Bi@γ-Al₂O₃ catalyst. K⁺ and Na⁺ had basically no effect on the COD removal rate, and the COD removal rates were 81.43% and 83.81%, respectively, with no significant change from the COD removal rate from raw water (85.24%), Cu²⁺ and Al³⁺ had some inhibitory effect on the COD removal rate, and the COD removal rate was 68.57% and 70.00%, respectively. While, the presence of Fe³⁺, Cl⁻, Br⁻ and SiO₃²⁻ had a significant inhibitory effect on the COD removal rate, and the COD removal rate was 61.90%, 51.90%, 55.71% and 60.48%. The concentration of Ca²⁺ was 50 mg/L and Mg²⁺ was 200 mg/L, the COD removal rate was 57.62% and 60.48%, respectively due to water hardness. The alkalinity had an inhibitory effect on the treatment effect of simulated waste water, when the OH concentration was 1500 mg/L, the COD removal rate was 49.05%. The higher the TDS concentration, the more obvious was the inhibitory effect on the COD removal rate, and the COD removal rate was 41.43% when the TDS was 50,000 mg/L. The intermediates and possible degradation mechanisms after catalytic ozone oxidation of hydroquinone-simulated wastewater by Fe-Bi@γ-Al₂O₃ were investigated by UV spectroscopy scanning, 3D fluorescence spectroscopy scanning, and GC–MS scanning.</p></div>","PeriodicalId":808,"journal":{"name":"Water, Air, & Soil Pollution","volume":"235 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Facet-Dependent Hematite Reactivity in Cr(Ⅵ) Removal with Fe(Ⅱ)","authors":"Shengnan Zhang, Lingyi Li, Junxue Li, Wei Cheng","doi":"10.1039/d4en00733f","DOIUrl":"https://doi.org/10.1039/d4en00733f","url":null,"abstract":"Hematite displays diverse crystal structures and often coexists with Fe(Ⅱ), both of which are crucial in controlling the fate and mobility of Cr(Ⅵ). However, the mechanisms underlying Cr(Ⅵ) removal in the presence of Fe(Ⅱ) on various hematite facets remain elusive. This study aims to elucidate the facet-dependent reactivity of hematite nanocrystals in conjunction with Fe(Ⅱ) for the removal Cr(Ⅵ) from aqueous solutions. Hematite nanoplates (HNPs), predominantly composed of {001} facets, and nanorods (HNRs), exposing both {001} and {110} facets, were synthesized and characterized. Their Cr(VI) removal capabilities were evaluated in hematite-Cr(VI) and hematite-Fe(II)-Cr(VI) systems, as well as the Fe(II)-Cr(VI) system. The adsorption of Fe(Ⅱ) and Cr(VI) on hematite surfaces was highly dependent on the crystal facets and pH, with HNRs demonstrating superior Cr(Ⅵ) adsorption over HNPs, especially under acidic conditions. Neutral pH favored Fe(II)-Cr(VI) redox reactions and Fe(II) adsorption. The hematite-Fe(Ⅱ) couple displayed a synergistic effect in removing Cr(Ⅵ) under acidic conditions, which was not observed under neutral conditions. The presence of Fe(Ⅱ) notably enhanced Cr(Ⅵ) adsorption onto hematite, and bound Fe(Ⅱ) facilitated electron transfer, accelerating Cr(Ⅵ) reduction. HNRs-Fe(Ⅱ) exhibited higher Cr(Ⅵ) removal efficiency than HNPs-Fe(Ⅱ) due to their lower free corrosion potential and improved electron transport properties. This research underscores the potential of facet engineering in optimizing hematite nanocrystals for environmental remediation, specifically in Cr(Ⅵ)-contaminated environments.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"46 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}