- 作者: 俞杰飛、賈金平、馬紫峰
- 作者服務機構: School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
- 中文摘要: The voltammetric behaviour of four azo dyes has been compared at a glassy carbon electrode. It is shown that the azo dyes (e.g. Reactive Brilliant Red x-3b (RBR x-3b), Acid Red 6b (AR 6b)) with a hydroxyl group in the ortho position with respect to the azo bridge give rise to well defined, irreversible peaks for the oxidation and reduction process within a pH range of 2-12. In the case of the non-hydroxyl azo dye (e.g. Reactive Yellow x-rg (RY x-rg)), or azo dye with a meta hydroxyl group (e.g. Reactive Orange x-gn (RO x-gn)), the oxidation was comparatively tougher, and the peak was not clear or even invisible in the accessible potential range. The mechanism of electrochemical oxidation of RBR x-3b, as well as AR 6b is proposed. The reduction steps were only accessible when pH < 8 for RY x-rg and RO x-gn dye compounds. For the hydroxyl-substituted dyes, re-oxidation peaks were obtained in the subsequent scan, owing to the oxidation of reduction products-amine or hydroazo intermediates.
- 英文摘要: --
- 中文關鍵字: Glassy carbon electrode; Azo dye; Hydroxyl group; Ortho position; Electroxidation.
- 英文關鍵字: --