XAFS study on oxidation dissolution of arsenopyrite in O<sub>2</sub>-bearing solution

Guoqing ZHANG; Mingmei ZHANG; Shaofeng WANG; Yongfeng JIA

doi:10.11889/j.0253-3219.2016.hjs.39.110103

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XAFS study on oxidation dissolution of arsenopyrite in O₂-bearing solution

SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS | 更新时间：2021-05-24

- XAFS study on oxidation dissolution of arsenopyrite in O₂-bearing solution
- NUCLEAR TECHNIQUES Vol. 39, Issue 11, Article number: 110103(2016)
- 作者机构：
  
  1.中国科学院沈阳应用生态研究所污染生态与环境工程重点实验室沈阳 110016
  2.中国科学院大学北京 100049
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China
- DOI：10.11889/j.0253-3219.2016.hjs.39.110103
  CLC： TL99
- Received：16 August 2016，
  
  Revised：11 October 2016，
  
  Published：2016-11
- 稿件说明：
移动端阅览
Guoqing ZHANG, Mingmei ZHANG, Shaofeng WANG, et al. XAFS study on oxidation dissolution of arsenopyrite in O₂-bearing solution[J]. Nuclear techniques, 2016, 39(11): 110103
DOI：

Guoqing ZHANG, Mingmei ZHANG, Shaofeng WANG, et al. XAFS study on oxidation dissolution of arsenopyrite in O₂-bearing solution[J]. Nuclear techniques, 2016, 39(11): 110103 DOI： 10.11889/j.0253-3219.2016.hjs.39.110103.

摘要

毒砂的氧化溶解是环境As污染的重要来源之一。本研究对毒砂的氧化反应过程及产物进行了研究。考察了不同参数：pH、溶解氧（Dissolved Oxygen，DO）对毒砂氧化反应的影响，利用X射线吸收精细结构（X-ray Absorption Fine Structure，XAFS）分析了毒砂氧化过程中As的形态转化。XAFS光谱学数据表明，pH=4时，毒砂发生较强的氧化反应，释放的As（V）被氧化过程中形成的铁氧化物吸附；pH=7时，毒砂氧化释放的As（III）被铁氧化物吸附，表面存在少量的类似雄黄（AsS）的物质；而pH=9时，毒砂几乎不发生氧化，表面只存在少量的硫代亚砷。结果表明，pH是影响毒砂氧化的重要因素。中碱性条件下，毒砂氧化反应释放出的Fe快速形成了Fe的氧化物沉淀，包裹在毒砂的表面，阻碍毒砂继续氧化。

Abstract

Background

One of the most important pollution sources of arsenic is the oxidation dissolution of arsenopyrite in oxygen-bearing solution.

Purpose

This work investigated the oxidation process and product of arsenopyrite in O

-bearing solution using batch experiment.

Methods

The influences of pH and dissolved oxygen (DO) on the oxidation dynamics of arsenopyrite are investigated. Besides that we also analyze the transformation of arsenic in the process of the oxidation of arsenopyrite using X-ray Absorption Fine Structure (XAFS).

Results

XAFS spectroscopy data shows that

at pH=4

the oxidation of arsenopyrite is intensive and the released As(V) would be absorbed by iron oxide formed in the process of oxidation; at pH=7

the released As(III) would be absorbed by iron oxide and a few realgar analogues appear in the surface of arsenopyrite; at pH=9

the oxidation of arsenopyrite almost does not occur

but only a small amount of thioarsenates exhibit in the surface of arsenopyrite.

Conclusion

The pH is the most important parameter controlling the oxidation of arsenopyrite. The oxidation of arsenopyrite is inhibited in neutral and alkaline conditions

due to the formation of Fe oxides on the surface of arsenopyrite quickly.

关键词

Keywords

references

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XAFS study on oxidation dissolution of arsenopyrite in O2-bearing solution

DOI：10.11889/j.0253-3219.2016.hjs.39.110103

摘要

Abstract

关键词

Keywords

references

XAFS study on oxidation dissolution of arsenopyrite in O₂-bearing solution