Oxidation Characteristics of the Reactivity Between Pyrite and Aqueous Arsenate

论文摘要

Natural pyrites contain high levels of adsorbed and structurally incorporated arsenic（As）,which may simultaneously result in the release of As and affect the oxidation process of pyrite.However,the oxidation and electrochemical behaviors of As on the oxidation reactivity of pyrites are still not clear.In this study,pyrite was prepared by a hydrothermal method and applied to study the oxidation mechanism between pyrite and aqueous arsenate.Analyses of X-ray diffraction,X-ray photoelectron spectroscopy,and scanning electron microscopy demonstrate that the as-prepared sample is an octahedron-like pyrite with high purity and crystallinity.The interaction between As（V）and pyrite as well as the electrochemical behaviors of pyrite oxidation in the presence of aqueous arsenate were investigated under acidic conditions by an ion analysis method,cyclic voltammetry（CV）,Tafel,and electrochemical impedance spectroscopy（EIS）.The results of the chemical reaction indicate that electrons are transferred from S 22-to dissolved oxygen with the formation of SO 42-in the initial As（V）concentration range of 0–0.3 mmol/L.In the initial As（V）concentration range of 0.4–1.2 mmol/L,electrons are transferred from S 22-to As（V）with the formation of elemental S 0and As（III）.The CV,the Tafel plot and EIS analyses indicate that aqueous arsenate in an electrolyte promotes oxidation reactivity and passivation of the pyrite electrode.Moreover,the electron transfer rate increases with increasing aqueous arsenate concentration in the electrolyte.

论文目录

文章来源

类型: 期刊论文

作者: Yongling Liu,Songhai Wu,Shaoyi Jia,Zongsheng Liang,Xu Han

来源: Transactions of Tianjin University 2019年04期

年度: 2019

分类: 工程科技Ⅱ辑,工程科技Ⅰ辑

专业: 化学,矿业工程

单位: School of Chemical Engineering and Technology,Tianjin University,Key Lab of Indoor Air Environment Quality Control,School of Environmental Science and Engineering,Tianjin University

基金: financially supported by the National Key Research and Development Program of China (No. 2017YFC0211500),the National Natural Science Foundation of China (Nos. 51878449,21806121,51508384)

分类号: TD981;O646.5

页码: 371-380

总页数: 10

文件大小: 3869K

下载量: 6

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