pH、温度和浓度对苯酚在V掺杂MoO_x-C/Ti电极上的电催化氧化的影响
The Effect of pH,Temperature and Concentration on Electrooxidation of Phenol on V co-doped MoO_x-C /
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摘要: 采用溶胶-凝胶法合成MoOx、MoOx-V5+(x%)胶体,通过Vulcan XC-72炭黑负载制备炭载钼系氧化物电催化剂.利用循环伏安法(CV)测试手段研究苯酚在电极上的氧化降解,考察了掺杂元素、溶液pH值、苯酚浓度、扫描速率、温度对苯酚氧化性能的影响.测试结果表明:苯酚在电极上的氧化是受扩散和电子转移联合控制的复杂过程;掺杂过渡金属元素V可以降低苯酚氧化的表观活化能,提高电化学性能;溶液的pH值越低,MoOx-C/Ti电极对苯酚的催化氧化活性越高;pH在0~6,苯酚的氧化经历了相似的历程,包含了相同的电子数和质子数;苯酚氧化峰电流随着浓度、温度的增加而增加,到一定程度后趋于稳定.Abstract: MoOx、MoOx-V5+(x%) were prepared by sol-gel method and Vulcan XC-72 carbon was used as carrier due to its porous structure.The oxidation degradation of phenol on these electrodes had been studied by cyclic voltammetry.Electrochemistry performances at different doped element,pH,phenol concentration,scan rates and temperature were studied.The results indicated that the oxidation process is an sophisticated process controlled by diffusion and transferrion.The doping element V decreased the activation energy and...
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