Adsorption and Electrosorption of Ethyl Xanthate and Thiocyanate Anions at High-Area Carbon-Cloth Electrodes Studied by in Situ UV Spectroscopy:  Development of Procedures for Wastewater Purification

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 wa...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2001-03, Vol.73 (6), p.1181-1189
Main Authors: Ayranci, Erol, Conway, Brian E
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Industrial wastewaters
Pollution
Wastewaters
Water treatment and pollution
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Summary: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.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac000736e