Abstract
Adsorption and electrosorption behavior of ethyl xanthate (EtX-) and thiocyanate (SCN-) anions, individually and when they are together in a solution, were studied at high-area C-cloth electrodes by in situ UV spectroscopy in relation to development of methodologies for purification of industrial wastewaters. The employment of straightforward, yet demonstrably useful spectrophotometric techniques of kinetics and scanning kinetics is described. Adsorption isotherms of EtX- and SCN- were also derived. However, EtX- was found to decompose to a small extent during electrosorption on C-cloth and/or Au or Pt surfaces, causing some interference with the spectrophotometric analysis of SCN- at 215 nm. After long prior contact of the C-cloth with water, the adsorption rates of EtX- and SCN- are somewhat increased. Competitive adsorption studies show that SCN- ion does not become adsorbed on the C-cloth in the presence of EtX-, thus demonstrating a remarkable discriminatory effect.
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