含As(Ⅲ)盐酸体系阴极反应动力学  

Kinetics of cathodic reaction in As(Ⅲ) hydrochloric acid system

作　　者：曹华珍 舒燕翔 张煜峰 单海鹏 郑国渠 CAO Hua-zhen;SHU Yan-xiang;ZHANG Yu-feng;SHAN Hai-peng;ZHENG Guo-qu(College of Chemical Engineering and Materials Science,Zhejiang University of Technology,Hangzhou 310014,China)

机构地区：[1]浙江工业大学材料科学与工程学院,杭州310014

出　　处：《中国有色金属学报》2018年第12期2551-2557,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51374185);浙江省自然科学基金资助项目(Y5100261)~~

摘　　要：采用CHI660A电化学工作站测定了As(Ⅲ)盐酸体系中扫描伏安曲线和阴极极化曲线,研究了柠檬酸铵与Sb(Ⅲ)对阴极反应动力学参数nα值和表观活化能的影响。结果表明:柠檬酸铵的加入,不仅使As H3还原的传递系数nα值降低,抑制AsH_3的析出,同时,还降低了As(Ⅲ)还原为As的传递系数,升高反应的表观活化能,阻碍了砷的还原。而Sb(Ⅲ)的加入不仅抑制了AsH_3的析出,而且增大了As(Ⅲ)还原为As的nα值,降低表观活化能,即Sb(Ⅲ)的加入促进单质As的还原。The sweep voltammetry curves and cathodic polarization curves of As(Ⅲ)hydrochloric acid system were measured by CHI660A electrochemical workstation.The effects of ammonium citrate and Sb(Ⅲ)on the kinetics parameters nαand apparent activation energy of As(Ⅲ)reduction were investigated.The results show that the addition of ammonium citrate reduces the transfer coefficient of arsine reduction and suppresses the evolution of arsine.However,the transfer coefficient of arsenic reduction also decreases and the apparent activation energy for arsenic reduction increases,i.e.the addition of ammonium citrate will inhibit the arsenic reduction.The addition of Sb(Ⅲ)suppresses the evolution of arsine and increases transfer coefficient of arsenic reduction remarkably.Meanwhile,the apparent activation energy reduces.The addition of Sb(Ⅲ)can promote the reduction of arsenic.

关 键 词：电沉积 砷化氢 柠檬酸铵 锑 动力学 

分 类 号：O646.541[理学—物理化学]