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Arsenic Removal from Groundwater Using Iron Pyrite:Influence Factors and Removal Mechanism

Journal of Earth Science 2023年第3期34卷 857-867页

作者： muhammad yousuf jat baloch Chunli Su Shakeel Ahmed Talpur Javed Iqbal Kulvinder Bajwa School of Environmental Studies China University of GeosciencesWuhan 430078China State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution Ministry of Ecology and EnvironmentWuhan 430078China College of New Energy and Environment Jilin UniversityChangchun 130021China University School for Graduates Studies Chaudhary Devi Lal University125055 Sirsa HaryanaIndia

Iron pyrite has been reported as a kind of potential material for arsenic(As)removal from the groundwater because it exhibits a strong attraction in groundwater for both arsenite and arsenate *** this study,batch adsorption experiments were carried out to determine the optimum conditions for As adsorption by the iron pyrite adsorbent,including the initial concentration,adsorbent dosage ratio,pH,temperature and stirring *** characterization methods were employed to identify the mechanism of As *** removal efficiency for As(Ⅲ)was observed 93%at pH=7,and for As(Ⅴ)was 95%observed at pH=*** model resulted in the maximum adsorption capacity(q_(m))for As(Ⅲ)and As(Ⅴ)were 571.7 and 671.1μg/g,respectively,as well as the experiments were found to be favorable as separation factor R_(L)1)indicates favorable *** pseudo-first and second-order kinetic models also fitted *** addition of oxalate on the adsorbent surface plays an important role for the recycling of Fe(Ⅱ)/Fe(Ⅲ)to minimize the arsenic *** surface area,ion exchange mechanism and structure of adsorbent confirmed that addition of oxalate could enhance the surface area of adsorbent.

关键词： arsenic groundwater pyrite adsorption oxalate hydrochemistry

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Application of Synthetic Iron Oxyhydroxide with Influencing Factors for Removal of As(Ⅴ) and As(Ⅲ) from Groundwater

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Journal of Earth Science 2024年第3期35卷 998-1009页

作者： Shakeel Ahmed Talpur muhammad yousuf jat baloch Chunli Su Javed Iqbal Aziz Ahmed Hafeez Ahmed Talpur School of Environmental Studies China University of GeosciencesWuhan 430078China DiSPUTer Department of PsychologicalHealth and Territory SciencesUniversity“G.d′Annunzio”Chieti-Pescara66100 ChietiItaly College of New Energy and Environment Jilin UniversityChangchun 130021China School of Plant Environment and Soil SciencesLouisiana State University Agricultural CentreBaton Rouge LA 70803USA Department od Engineering and Geology University“G.d′Annunzio”Chieti-Pescara66100 ChietiItaly

Synthesized iron oxyhydroxide was applied for the adsorptive removal of As(V)and As(III)from the aquas ***,this investigation highlighted the synergistic effect of calcium carbonate in conjunction with iron oxyhydroxide,resulting in enhanced removal *** experiment was conducted under various conditions:concentration,dosage,pH,agitation,and *** characterizations such as Brunauer Emmett Teller,X-ray diffraction,scanning electron microscopy,and Fourier transform infrared spectroscopy were implied to understand adsorption *** Langmuir model revealed optimal concentrations for As(V)=500μg/L at pH-5 and As(III)=200μg/L at pH-7,resulting in 95%and 93%adsorption efficiencies,*** adsorption capacities“qm”were found to be 1266.943μg/g for As(V)and 1080.241μg/g for As(III).Freundlich model demonstrated favorable adsorption by indicating“n>1”such as As(V)=2.542 and As(III)=2.707;similarly,the speciation factor“RL<1”for both species as As(V)=0.1 and As(III)=0.5,*** kinetic study presented a pseudo-second-order model as best fitted,indicating throughout chemisorption processes for removing As(V)and As(III).Furthermore,incorporating calcium carbonate presented a significant leap in the removal efficiency,indicating As(V)from 95%to 98%and As(III)from 93%to 96%,*** findings offer profound motivation for developing effective and sustainable solutions to tackle arsenic contamination,underscoring the exceptional promise of iron oxyhydroxide in conjunction with calcium carbonate to achieve maximum removal efficiency.

关键词： adsorption arsenic As(V) As(III) iron oxyhydroxide isotherms kinetics groundwater.

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Physiological characteristics,geochemical properties and hydrological variables influencing pathogen migration in subsurface system:What we know or not?

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Geoscience Frontiers 2022年第6期13卷 315-330页

作者： Wenjing Zhang Juanfen Chai Shuxin Li Xinzi Wang Shengyu Wu Zhentian Liang muhammad yousuf jat baloch Luis F.O.Silva Dayi Zhang Key Laboratory of Groundwater Resources and Environment(Jilin University) Ministry of EducationChangchun 130021China College of New Energy and Environment Jilin UniversityChangchun 130021China School of Environment Tsinghua UniversityBeijing 100084China Departamento de Ingeniería Civil y Arquitectura Universidad de LimaAvenida Javier Prado Este 4600Santiago de Surco 1503Peru Department of Civil and Environmental Universidad de la CostaCalle 58#55-66080002 BarranquillaAtlánticoColombia

The global outbreak of coronavirus infectious disease-2019(COVID-19)draws attentions in the transport and spread of Severe Acute Respiratory Syndrome Coronavirus 2(SARS-CoV-2)in aerosols,wastewater,surface water and solid *** pathogens eventually enter the subsurface system,e.g.,soils in the vadose zone and groundwater in the aquifers,they might survive for a prolonged period of time owing to the uniqueness of subsurface *** addition,pathogens can transport in groundwater and contaminate surrounding drinking water sources,possessing long-term and concealed risks to human *** work critically reviews the influential factors of pathogen migration,unravelling the impacts of pathogenic characteristics,vadose zone physiochemical properties and hydrological variables on the migration of typical pathogens in subsurface *** assessment algorithm and two rating/weighting schemes are proposed to evaluate the migration abilities and risks of pathogens in subsurface *** there is still no evidence about the presence and distribution of SARS-CoV-2 in the vadose zones and aquifers,this study also discusses the migration potential and behavior of SARS-CoV-2 viruses in subsurface environment,offering prospective clues and suggestions for its potential risks in drinking water and effective prevention and control from hydrogeological points of view.

关键词： Pathogens Viruses SARS-CoV-2 Subsurface system Migration

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Arsenic Removal from Groundwater using Iron Pyrite: Influences Factors and Removal Mechanism

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Journal of Earth Science 2022年

作者： muhammad yousuf jat baloch Chunli Su Shakeel Ahmed Talpur Javed Iqbal Kulvinder Bajwa School of Environmental Studies， China University of Geosciences State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution， Ministry of Ecology and Environment College of New Energy and Environment， Jilin University University School for Graduates Studies， Chaudhary Devi Lal University

Iron pyrite has been reported as a kind of potential material for arsenic （As） removal from the groundwater because it exhibits a strong attraction in groundwater for both arsenite and arsenate species. In this study， batch adsorption experiments were carried out to determine the optimum conditions for As adsorption by the iron pyrite adsorbent， including the initial concentration， adsorbent dosage ratio， pH， temperature and stirring rate. Precisely characterization methods were employed to identify the mechanism of As removal. Maximum removal efficiency for As（III） was observed 93% at pH=7， and for As（V） was 95% observed at pH=5. Langmuir model resulted in the maximum adsorption capacity (q;) for As（III） and As（V） were 571.7 μg/g and 671.1 μg/g respectively， as well as the experiments were found to be favorable as separation factor R; 1） indicates favorable adsorption. The pseudo-first and second-order kinetic models also fitted well. The addition of oxalate on the adsorbent surface plays an important role for the recycling of Fe（II）/Fe（III） to minimize the arsenic concentration. Specific surface area， ion exchange mechanism and structure of adsorbent confirmed that addition of oxalate could enhance the surface area of adsorbent.

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