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研究了自组装TiO2纳米管(TNAs)光电催化降解葡萄糖的动力学和机理.利用薄层反应器进行耗竭反应,研究了TNAs表面催化反应和溶液本体-扩散层传质有关的葡萄糖降解过程.采用电流-时间曲线以及相应的微分曲线分析了光电化学催化降解的微观进程.结果表明,葡萄糖的初始浓度与降解的起始电流强度符合Langmuir吸附等温式I0ph=0.00008c0/(1+0.69274c0)+0.00034,葡萄糖在TNAs薄膜催化剂表面的吸附为单一分子层吸附,其光电催化降解反应符合一级反应动力学,葡萄糖降解反应经历了三个不同的反应过程.
The kinetics and mechanism of photoelectrocatalytic degradation of glucose by self-assembled TiO2 nanotubes (TNAs) were studied. The degradation reaction of TNAs on the surface of the TNAs and the mass transfer of solution bulk-diffusion layer were studied by using thin layer reactor. The results showed that the initial concentration of glucose and the initial intensity of degradation accorded with the Langmuir isotherm I0ph = 0.00008c0 / (1 + 0.69274c0) + 0.00034. The adsorption of glucose on the surface of TNAs thin film catalyst was single molecular layer. The photoelectrocatalytic degradation reaction was in accordance with the first order reaction kinetics. The glucose degradation reaction underwent three different reaction processes.