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

作　　者：Muhammad Yousuf Jat Baloch Chunli Su Shakeel Ahmed Talpur Javed Iqbal Kulvinder Bajwa 

机构地区：[1]School of Environmental Studies,China University of Geosciences,Wuhan 430078,China [2]State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution,Ministry of Ecology and Environment,Wuhan 430078,China [3]College of New Energy and Environment,Jilin University,Changchun 130021,China [4]University School for Graduates Studies,Chaudhary Devi Lal University,125055 Sirsa Haryana,India

出　　处：《Journal of Earth Science》2023年第3期857-867,共11页地球科学学刊（英文版）

基　　金：jointly funded by the National Natural Science Foundation of China(Nos.42177078 and 42020104005)。

摘　　要：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_(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.The value of“n”2.68 and 2.47 for As(Ⅲ)and As(Ⅴ)obtained by Freundlich model(n>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.

关 键 词：ARSENIC GROUNDWATER PYRITE ADSORPTION OXALATE HYDROCHEMISTRY 

分 类 号：P579[天文地球—矿物学] X523[天文地球—地质学]