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化学学报
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化学学报 ›› 1990, Vol. 48 ›› Issue (8): 801-805. 上一篇    下一篇

研究论文

磷钼钒杂多阴离子的液/液界面电化学研究

汪尔康;刘玉清   

  1. 中国科学院长春应用化学研究所
  • 发布日期:1990-08-15

Electrochemical behavior of heteropoly phosphomolybdovanadate anions at the liquid/liquid interface

WANG ERKANG;LIU YUQING   

  • Published:1990-08-15

PDF

557

被引次数

5 | 1

用循环伏安法研究了V^vMo11-V5^vMo7杂多阴离子在水/硝基苯界面的转移行为, 观察了溶液酸度对转移行为的影响及杂多阴离子稳定存在的pH范围, 钒取代的杂多阴离子稳定性较12-磷钼杂多酸显著提高, 但随钒原子数增加离子稳定性降低, 在"电位窗"内转移的离子主要为-4价, 转移过程为扩散控制, 由循环伏安实验得到了杂多阴离子的表观转移电位△0^wψ^0和转移自由能△Gtr^0^w^-^0,对于不同钒数的杂多阴离子, 其半波电位E1/2与pH关系均可用E1/2=A-37pH(mV)描述。

关键词: 钒酸盐, 杂多酸, 钼酸盐, 磷酸盐, 阴离子, 电化学, 循环伏安法, 界面转移

Electrochem. transfer behavior of the VVMo11-V5VMo7 heteropolyanions at the water/nitrobenzene interface was investigated by using cyclic voltammetry. The effect of the solution acidity on the transfer behavior and the stable pH range of heteropolyanions were observed Mixed molybdovanadate anions are more stable than 12-molybdophosphoric acid, however, the stability of the former decreases with increasing no. of V atoms. The main transfer species within the "potential window" has the neg. charges of 4 and the transfer process is diffusion controlled. The apparent transfer potential and the free energy, for heteropolyanions can be obtained through the voltammetric data. For different anions, the E1/2-pH relationship can be described as E1/2 = A - 37 pH.

Key words: VANADATE, HETEROPOLYACID, MOLYBDATE, PHOSPHATE, ANION, ELECTROCHEMISTRY, CYCLOVOLTAMGRAPH, INTERFACIAL TRANSFER

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