高效自组装二氧化钛纳米管阵列光电催化降解葡萄糖的动力学和机理(英文)  

Kinetics and Mechanisms for Photoelectrochemical Degradation of Glucose on Highly Effective Self-Organized TiO_2 Nanotube Arrays

作　　者：刘冰川[1] 李金花[1] 周保学[1] 郑青[1] 白晶[1] 张嘉凌[1] 刘艳彪[1] 蔡伟民[1] 

机构地区：[1]上海交通大学环境科学与工程学院,上海200240

出　　处：《催化学报》2010年第2期163-170,共8页

基　　金：Supported by the National High Technology Research and Development Program of China (863 Program, 2009AA063003);the Science and Technology Commission of Shanghai Municipality (08JC1411300, 0952NM01800);the National Natural Science Foundation of China (20677039)

摘　　要：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 mechanisms of photoelectrochemical catalytic degradation of glucose on self-organized TiO2 nanotube arrays （TNAs） were investigated. A thin-layer cell was used to obtain an exhausted reaction condition with which an overall degradation process of glucose could be identified including surface reaction on TNAs and mass transfer from body solution to the diffuse layer. Current-time （Iph-0 and the corresponding differential coefficient profiles were used to analyze the micro-processes of photoelectrochemical catalytic degrada- tion. The initially generated photocurrents on glucose degradation versus glucose concentrations fits well with Langmuir adsorption iso- therm, 10ph = 0.00008c0/（1 ＋0.69274C0）＋0.00034. This confirmed the adsorption of glucose on TNAs film catalyst was a single molecule layer adsorption, and the photoelectrochemical catalytic degradation reaction kinetics on TNAs surface belonged to a first-order reaction. After the initial quick reaction, three consecutive micro kinetic processes were revealed by the differential coefficient profiles （dIph/dt-t） of the glucose degradation profiles （Iph-t）.

关 键 词：自组装二氧化钛纳米管阵列 光电化学催化反应 葡萄糖 薄层反应器 反应动力学 机理 

分 类 号：O643.32[理学—物理化学]