Phase transfer of the 12-tungstosilicate anion across the water/nitrobenzene interface
Phase transfer of the 12-tungstosilicate anion across the water/nitrobenzene interface
复制标题
12-钨硅酸盐阴离子穿过水/硝基苯界面的相转移
DOI：
10.1039/f19888402289
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
Yuqing Liu
中科院分区：
文献类型：
--
作者：
E. Wang;Yuqing Liu
用循环伏安法和循环线性电流扫描计时电位法研究了杂多阴离子[SiW_（12）O_（40）]~（4-）在水/硝基苯界面上的迁移行为。结果表明，负电荷为4的杂多阴离子可以通过电化学方法从水相转移到有机相中。转移过程在较低扫描速率下是扩散控制的，但在较高扫描速率下是部分动力学控制的。研究了Sr ~（2+）、Co ~（2+）、Ni ~（2+）、Zn ~（2+）、Fe ~（2+）、Fe ~（3+）等高价阳离子以及NO ~（3-）、Cl ~-、SO ~（2-）、PO ~（3-）等阴离子对土壤中有机物的影响。从循环伏安图中系统地观察到了相转移的影响。根据伏安数据计算了杂多阴离子在水/硝基苯界面的形式转移电位和转移自由能。
The transfer behaviour of the heteropoly anion [SiW12O40]4– across the water/nitrobenzene interface has been investigated using cyclic voltammetry and chronopotentiometry with cyclic linear current scanning. It was found that the heteropoly anion with a negative charge of 4 can transfer from the aqueous phase to the organic phase electrochemically. The transfer process is diffusion-controlled at a lower scan rate, but it is partially kinetically controlled at a higher scan rate. The effects of some higher-valent cations such as Sr2+, Co2+, Ni2+, Zn2+, Fe2+ and Fe3+, as well as some anions such as NO–3, Cl–, SO2–4 and PO3–4etc. on the phase transfer have been systematically observed from cyclic voltammograms. The formal transfer potential and the transfer free energy for the heteropoly anion across the water/nitrobenzene interface have been calculated according to the voltammetric data.