(浙江工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，杭州 310014)
摘 要: 采用CHI660A電化學(xué)工作站測定了As(Ⅲ)鹽酸體系中掃描伏安曲線和陰極極化曲線，研究了檸檬酸銨與Sb(Ⅲ)對(duì)陰極反應(yīng)動(dòng)力學(xué)參數(shù)nα值和表觀活化能的影響。結(jié)果表明：檸檬酸銨的加入，不僅使AsH3還原的傳遞系數(shù)nα值降低，抑制AsH3的析出，同時(shí)，還降低了As(Ⅲ)還原為As的傳遞系數(shù)，升高反應(yīng)的表觀活化能，阻礙了砷的還原。而Sb(Ⅲ)的加入不僅抑制了AsH3的析出，而且增大了As(Ⅲ)還原為As的nα值，降低表觀活化能，即Sb(Ⅲ)的加入促進(jìn)單質(zhì)As的還原。
關(guān)鍵字: 電沉積；砷化氫；檸檬酸銨；銻；動(dòng)力學(xué)
（College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310014, China）
Abstract: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 nα and 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.
Key words: electrodeposition; arsine; antimony; ammonium citrate; kinetics
