A TiO₂-nanotubes-based coil-type microreactor for highly efficient photoelectrocatalytic degradation of organic compounds

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• 作者：Luka Suhadolnik^a ; ^b ; ^{luka.suhadolnik@ijs.si} ; Matic Krivec^c ; Kristina Žagar^a ; Goran Dražić^d ; Miran Čeh^a
• 关键词：Photoelectrocatalysis ; Continuous-flow microreactor ; TiO2 nanotubes ; Degradation of organic compounds
• 刊名：Journal of Industrial and Engineering Chemistry
• 出版年：2017
• 出版时间：25 March 2017
• 年：2017
• 卷：47
• 期：Complete
• 页码：384-390
• 全文大小：1534 K
• 卷排序：47

文摘

A continuous-flow, coil-type photoelectrocatalytic microreactor for the degradation of caffeine was designed, assembled and characterized. Its main components are the photocatalytically active anode and the cathode coils, which are wrapped around a silica-glass rod and placed into a UV-transparent housing. The anode coil was prepared by anodic oxidation of the titanium coil, which leads to the formation of vertically aligned, titanium dioxide, nanotube arrays that exhibit a high photocatalytic activity and are rigidly attached to the titanium wire. The photocatalytic, electrocatalytic and photoelectrocatalytic activities of the assembled microreactor were measured systematically while changing the main parameters that affect the device’s efficiency. The most significant change in the microreactor’s design in terms of efficiency was to place the cathode coils on both sides of the anode coil, which resulted in the shortest time for complete degradation of the caffeine. When an applied anodic bias potential of 4 V was used in the most efficient microreactor design, 1 mL of the 40 mg/L caffeine was fully decomposed in 55 min.