砷在酸性溶液体系中的氧化还原行为和化学形态（英文）

发布时间：2018-05-12 03:41

  本文选题：砷 + 铁-砷配合物　； 参考：《Transactions of Nonferrous Metals Society of China》2017年09期

【摘要】：冶炼酸性废水中砷的去除是一项十分紧迫的工作。目前最常用的方法是先将三价砷氧化为五价砷,然后再以铁盐进行沉淀去除。砷的氧化还原行为及化学形态基础研究对于砷的去除意义重大。采用循环伏安法和紫外可见分光光度法开展实验室研究,采用HSC和MINTEQ软件进行理论分析。研究发现三价砷的氧化是一个多电子转移反应,受扩散控制;在pH 1.0的硫酸溶液中,三价砷的氧化过电位非常高(约0.9 V)。另外,针对Fe(Ⅲ)-As(V)-H_2SO_4-H_2O系列溶液的紫外-可见光谱以及物质形态分析均表明Fe(Ⅲ)-As(V)配合物的存在。因此,基于其他研究者预测的热力学数据,绘制Fe(Ⅲ)、As(V)的物质形态随pH的分布规律图和包含Fe-As配合物的新型电位-pH图。
[Abstract]:The removal of arsenic from acid wastewater is an urgent task. The most commonly used method is to oxidize trivalent arsenic to pentavalent arsenic and then precipitate it with iron salt. The study on the redox behavior and chemical speciation of arsenic is of great significance to the removal of arsenic. The laboratory research was carried out by cyclic voltammetry and UV-Vis spectrophotometry, and the theoretical analysis was carried out by HSC and MINTEQ software. It is found that the oxidation of trivalent arsenic is a multielectron transfer reaction controlled by diffusion, and the oxidation overpotential of trivalent arsenic is very high (about 0.9 V ~ (-1) in pH 1.0 sulfuric acid solution. In addition, the UV-Vis spectra and speciation analysis of Fe (鈪，

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