School of the Marin, Harbin Institute of Technology at Weihai, Weihai, Shandong, 264209, China.
J Hazard Mater. 2011 Aug 30;192(2):779-85. doi: 10.1016/j.jhazmat.2011.05.085. Epub 2011 Jun 2.
The electrochemical regeneration of Ce(IV) for mediated electrochemical oxidation in sulfuric acid media was investigated in an electrolytic membrane reactor. A simple kinetic model was developed to analyze and simulate the regeneration of Ce(IV) in the electrolysis process. The model was based on the Faraday's law and the mass balance of components in the reactor. The key operating conditions of the initial electrolyte concentration and the regeneration time were analyzed. It was found that the simulating model agreed well with the experimental data for regeneration of Ce(IV). Experimental results showed that Ce(SO₄)⁻₂ is the active species. The decomposition of surface complex of Ce(IV) at the anode surface is the rate determining step. Constant-current electrolysis shows that the high proton and Ce(III) concentrations are electrochemically favorable for the regeneration of Ce(IV). The current efficiency for regeneration of Ce(IV) decrease obviously with the increase of SO(4)(2-) concentration from 0.8 to 2.4mol/L.
在硫酸介质中，用电解膜反应器研究了 Ce(IV)的电化学再生，以介导电化学氧化。开发了一个简单的动力学模型来分析和模拟电解过程中 Ce(IV)的再生。该模型基于法拉第定律和反应器中组分的质量平衡。分析了初始电解质浓度和再生时间等关键操作条件。结果表明，模拟模型与 Ce(IV)再生的实验数据吻合较好。实验结果表明，Ce(SO₄)⁻₂是活性物质。Ce(IV)在阳极表面上的表面配合物的分解是速率决定步骤。恒流电解表明，质子和 Ce(III)浓度高有利于 Ce(IV)的再生。当 SO(4)(2-)浓度从 0.8 增加到 2.4mol/L 时，Ce(IV)的再生电流效率明显下降。
