Kinetics and Mechanisms for Photoelectrochemical Degradation of Glucose on Highly Effective Self-Organized TiO₂ Nanotube Arrays

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• 作者：Bingchuan LIU ; Jinhua LI ; Baoxue ZHOU ; Qing ZHENG ; Jing BAI ; Jialing ZHANG ; Yanbiao LIU ; Weimin CAI
• 关键词：self-organized titania nanotube arrays ; photoelectrochemical catalytic reaction ; glucose ; thin-layer cell ; kinetic ; mechanism
• 刊名：Chinese Journal of Catalysis
• 出版年：2010
• 出版时间：February 2010
• 年：2010
• 卷：31
• 期：2
• 页码：163-170
• 全文大小：1122 K

文摘

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 (I_ph-t) and the corresponding differential coefficient profiles were used to analyze the micro-processes of photoelectrochemical catalytic degradation. The initially generated photocurrents on glucose degradation versus glucose concentrations fits well with Langmuir adsorption isotherm, I_0ph = 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 (dI_ph/dt-t) of the glucose degradation profiles (I_ph-t).