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Sorption of Differently Charged Gold Nanoparticles on Synthetic Pyrite
Suxing Luo;  Xin Nie;  Meizhi Yang;  Yuhong Fu;  Ping Zeng;  Quan Wan
2018
发表期刊Minerals
卷号8期号:10页码:1-13
摘要

Sorption of nanoparticles on mineral surfaces has been well recognized for its environmental implication. For certain gold ore deposits, sorption of gold nanoparticles (AuNPs) on pyrite may constitute a critical step in the metallogenesis process, yet it has not been adequately investigated. In this work, we synthesized negatively charged, positively charged AuNPs and pyrite respectively, and experimentally studied sorption of AuNPs on pyrite in an anaerobic environment. The effects of AuNPs charge characteristics, pH, hexadecyl trimethyl ammonium bromide (CTAB) concentration, and ionic strength were evaluated. For the negatively charged AuNPs, almost no sorption was observed owing to the electrostatic repulsion between the AuNPs and pyrite surface (with a measured isoelectric point of 2.0). In contrast, positively charged AuNPs could be significantly adsorbed on pyrite through electrostatic attraction, with the sorption extent decreasing with the increase of pH (2.2-9.1). However, the adsorption of CTAB from the solution was found to increase with the increase of pH. Furthermore, deliberately added CTAB seemed to inhibit the sorption of AuNPs. Our study not only demonstrates that the electrostatic interaction is the dominant mechanism in the sorption of AuNPs on pristine pyrite, but also reveals the important competitive relation between AuNPs and CTAB in the sorption process.

关键词Gold Nanoparticles Pyrite Sorption Charge Electrostatic Interaction
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/8910
专题矿床地球化学国家重点实验室
作者单位1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.School of Geographic and Environmental Sciences, Guizhou Normal University, Guiyang 550001, China
推荐引用方式
GB/T 7714
Suxing Luo;Xin Nie;Meizhi Yang;Yuhong Fu;Ping Zeng;Quan Wan. Sorption of Differently Charged Gold Nanoparticles on Synthetic Pyrite[J]. Minerals,2018,8(10):1-13.
APA Suxing Luo;Xin Nie;Meizhi Yang;Yuhong Fu;Ping Zeng;Quan Wan.(2018).Sorption of Differently Charged Gold Nanoparticles on Synthetic Pyrite.Minerals,8(10),1-13.
MLA Suxing Luo;Xin Nie;Meizhi Yang;Yuhong Fu;Ping Zeng;Quan Wan."Sorption of Differently Charged Gold Nanoparticles on Synthetic Pyrite".Minerals 8.10(2018):1-13.
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