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The influence of humic acids on the weathering of pyrite: Electrochemical mechanism and environmental implications
Kai Zheng;  Heping Li;  Liping Xu;  Shengbin Li;  Luying Wang;  Xiaoying Wen;  Qingyou Liu
2019
Source PublicationEnvironmental Pollution Volume
Volume251Pages:738-745
Abstract

Pyrite weathering often occurs in nature and causes heavy metal ion pollution and acid mine drainage during the process. Humic acid (HA) is a critical natural organic material that can bind metal ions, thus affecting metal transfer and transformation. In this work, in situ electrochemical techniques combined with spectroscopic analysis were adopted to investigate the interfacial processes involved in pyrite weathering with/without HA. The results showed that the pyrite weathering mechanism with/without HA is FeS2 → Fe2+ + 2S0 + 2e. The presence of HA did not change the pyrite weathering mechanism, but HA adsorbs on the pyrite surface and inhibits the further transformation of sulfur. Furthermore, HA and Fe(II) ions can form complex at 45.0 °C. Increased concentration of HA, decreased HA solution acidity or decreased environmental temperature would all weaken the pyrite weathering, for the above conditions cause pyrite weathering to have a larger resistance of the double layer and a larger passive film resistance. Pyrite will release 73.7 g m−2·y−1 Fe2+ to solution at pH 4.5, and the amount decreases to 36.8 g m−2·y−1in the presence of 100 mg/L HA. This study provides an in situ electrochemical method for the assessment of pyrite weathering.

KeywordPyrite humic Acid electrochemical Technique surface Analysis environmental Implications
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10189
Collection地球内部物质高温高压实验室
Affiliation1.Key Laboratory of High-temperature and High-pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China
2.University of Chinese Academy of Sciences, Beijing, 100039, China
3.Zhejiang Pharmaceutical College, Ningbo, 221116, China
Recommended Citation
GB/T 7714
Kai Zheng;Heping Li;Liping Xu;Shengbin Li;Luying Wang;Xiaoying Wen;Qingyou Liu. The influence of humic acids on the weathering of pyrite: Electrochemical mechanism and environmental implications[J]. Environmental Pollution Volume,2019,251:738-745.
APA Kai Zheng;Heping Li;Liping Xu;Shengbin Li;Luying Wang;Xiaoying Wen;Qingyou Liu.(2019).The influence of humic acids on the weathering of pyrite: Electrochemical mechanism and environmental implications.Environmental Pollution Volume,251,738-745.
MLA Kai Zheng;Heping Li;Liping Xu;Shengbin Li;Luying Wang;Xiaoying Wen;Qingyou Liu."The influence of humic acids on the weathering of pyrite: Electrochemical mechanism and environmental implications".Environmental Pollution Volume 251(2019):738-745.
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