酸性溶液中Fe2+ /Fe3+相互转换对电极还原行为的影响

doi:10.13208/j.electrochem.161129

电化学（中英文） ›› 2017, Vol. 23 ›› Issue (6): 702-707. doi: 10.13208/j.electrochem.161129

酸性溶液中Fe²⁺ /Fe³⁺相互转换对电极还原行为的影响

秦建新*，林峰，刘文平，陈超，任孟德

中国有色桂林矿产地质研究院广西超硬材料重点实验室，国家特种矿物材料工程技术研究中心，广西桂林 541000

收稿日期:2016-11-29 修回日期:2017-03-03 出版日期:2017-12-28 发布日期:2017-03-30
通讯作者: 秦建新 E-mail:qdqinjianxin@163.com
基金资助:
广西科技计划基地和人才专项(重点实验室建设项目, No.16-380-35):资助

Effect of Fe²⁺/Fe³⁺Interconvertion on Reduction Behavior of Fe³⁺in Acidic Electrolytes

QIN Jian-xin^*, LIN Feng, LIU Wen-ping, CHEN Chao, REN Meng-de

Guangxi Key Laboratory of super-hard material, National Special Mineral Materials Engineering Technology Research Center, China Nonferrous Metals (Guilin) Geology and Mining Co., Ltd. Guilin 541004, China

Received:2016-11-29 Revised:2017-03-03 Published:2017-12-28 Online:2017-03-30
Contact: QIN Jianxin E-mail:qdqinjianxin@163.com

摘要/Abstract

摘要：

采用线性扫描伏安法和循环伏安法研究了含有Cl^-、SO₄^2-的酸性溶液中Fe²⁺/Fe³⁺相互转换对电极反应和Fe³⁺还原过程的影响. 结果表明: [Fe]_T=1 mol·L-1条件下，溶液中Fe³⁺/Fe²⁺的还原析出过程经过两个阶段：(1) E=0.35 V左右Fe³⁺还原成Fe²⁺过程; (2) E=-0.3 V之后H+的还原同时Fe²⁺离子与OH^-相结合生产Fe(OH)₂; Fe³⁺/Fe²⁺的相互转化主要影响Fe³⁺的第一还原阶段的还原峰电流和峰电位. |ipa/ipc|值随c(Fe³⁺ )/c(Fe²⁺ )增大而增大，且扫描速度慢时影响大，扫描速度快时影响小; 0.50 mol·L^-1 Fe²⁺+0.50 mol·L^-1 Fe³⁺时，随扫描速率的变化|ipa/ipc|值变化最小(|i_pa/i_pc|≈1.20). 同时，c(Fe³⁺ )/c(Fe²⁺ )也影响平衡电位，平衡电位随c(Fe³⁺ )/c(Fe²⁺ )增大而正移，电位从E₁=0.501 V升至E₅=0.565 V.

关键词: Fe²⁺/Fe³⁺相互转换, 循环伏安, 极化曲线, 还原行为

Abstract: The influences of ferrous/ferric (Fe²⁺/Fe³⁺) interconvertion on electrochemical reduction and electrode reaction of Fe³⁺ were investigated by using linear sweep voltammetry, potentiostatic method and cyclic voltammetry (CV) in acidic electrolytes containing chloride ion (Cl^- ) and sulfate ion (SO₄^2-). It was shown that the reduction process of Fe³⁺/Fe²⁺ would take place in two independent stages: (1) the reduction of Fe³⁺ to Fe²⁺ at E=0.35V and (2) the co-precipitation of Fe²⁺ by forming Fe(OH)₂ (E≤-0.3 V) instead of Fe. The major effect of Fe²⁺/Fe³⁺ interconvertion on the reduction is the |ipa/ipc| of quasi-reversible and equilibrium potential in the first stage. Practically speaking, the |ipa/ipc| values increased with the increase of c(Fe³⁺ )/c(Fe²⁺ ), and the values of |ipa/ipc| at fast sweep rates were less strongly affected than those at slow sweep rates. The least variation in |ipa/ipc| (|i_pa/i_pc|≈1.20) with sweep rate was observed in 0.50 mol·L^-1 Fe²⁺ and 0.50 mol·L^-1 Fe³⁺ solutions. Meanwhile, the equilibrium potential was also affected by c(Fe³⁺ )/c(Fe²⁺ ). The equilibrium potential shifted more positively from E₁=0.501 V in No. ① to E₅=0.565 V in No. ⑤ among the five samples studied in this work.

Key words: Fe²⁺/Fe³⁺interconvertion, cyclic voltammetry, polarization curve, reduction behavior

中图分类号:

O646.5

秦建新，林峰，刘文平，陈超，任孟德. 酸性溶液中Fe²⁺ /Fe³⁺相互转换对电极还原行为的影响[J]. 电化学（中英文）, 2017, 23(6): 702-707.

QIN Jian-xin, LIN Feng, LIU Wen-ping, CHEN Chao, REN Meng-de. Effect of Fe²⁺/Fe³⁺Interconvertion on Reduction Behavior of Fe³⁺in Acidic Electrolytes[J]. Journal of Electrochemistry, 2017, 23(6): 702-707.

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酸性溶液中Fe²⁺ /Fe³⁺相互转换对电极还原行为的影响

Effect of Fe²⁺/Fe³⁺Interconvertion on Reduction Behavior of Fe³⁺in Acidic Electrolytes

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