一甲基硫脲与支持电解质的阴离子在银电极上共吸附的拉曼光谱研究

Abstract

本文用电化学现场表面增强拉曼散射光谱（SErS）技术研究了MTu在HClO4、H2SO4和HnO3介质中分别与一种或两种无机阴离子的共吸附行为，发现ClO-4、SO2-4和nO-3等弱吸附无机阴离子均能被MTu诱导物理吸附在其质子化了的氨基（nH＋3）上，这三种无机阴离子被MTu诱导物理吸附的强弱顺序是：在电极电位位于-0.2V~-0.7V区间时，SO2-4＞ClO-4＞nO-3，在电位位于-0.8V~-1.2V区间时，ClO-4＞SO2-4＞nO-3。

Using surFace enhanced Raman spectroscopy (SERS), we have studied the coadsorption of 1 methyl 2 thiourea (MTU) with one or two kinds of inorganic anions in perchloric acid, sulphuric acid, nitric acid medium respectively at silver electrodes.The results indicate that inorganic anions with weak coadsorbability such as ClO - 4,SO 2- 4 and NO - 3 can be physically induced to absorb through the protonated amino group of MTU.It was Found that the coadsorbability of these anions with MTU is in the order of SO 2- 4>ClO - 4>NO - 3 in the potential region From -0 2V to -0 7V and ClO - 4>SO 2- 4>NO - 3 in the potential region From -0 8V to -1 2V.