Design of a Novel Cu2O/TiO2/Carbon Aerogel Electrode and Its Efficient Electrosorption-Assisted Visible Light Photocatalytic Degradation of 2,4,6-Trichlorophenol

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• 作者：Yabo Wang ; Ya-nan Zhang ; Guohua Zhao ; Hongyi Tian ; Huijie Shi ; Tianchen Zhou
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：August 22, 2012
• 年：2012
• 卷：4
• 期：8
• 页码：3965-3972
• 全文大小：468K
• 年卷期：v.4,no.8(August 22, 2012)
• ISSN：1944-8252

文摘

Cu₂O/TiO₂ heterojunction photocatalyst is built on carbon aerogel (CA) substrate with good adsorption properties by sol impregnation and seed-mediated synthesis approach. The Cu₂O/TiO₂/CA electrode has excellent electrosorptive and high efficient photocatalytic properties. Its morphology and surface chemical composition are characterized with SEM, TEM, X-ray diffraction (XRD) and Raman spectra. The UV鈥搗is diffuse reflectance spectra show that the optical absorption edge for Cu₂O/TiO₂/CA appears at 636 nm. Under visible-light (位 > 420 nm) irradiation, the photocurrent density increment on Cu₂O/TiO₂/CA is 60 times of that on Cu₂O/TiO₂/FTO. The electrochemical characteristic is investigated with electrochemical impedance spectrum (EIS). The Cu₂O/TiO₂/CA electrode is further applied in the electrosorptive photodegradation of the 2,4,6-trichlorophenol (2,4,6-TCP) wastewater. The result shows that the removal ratio of 2,4,6-TCP in 5.5 h on Cu₂O/TiO₂/CA is 96.3% and the TOC removal is 91.3%. The intermediates generated in the degradation process are analyzed by GC-MS and HPLC. The possible mechanism of visible light photocatalytic degradation of 2,4,6-TCP on Cu₂O/TiO₂/CA is also studied.

Keywords:

Cu₂O/TiO₂/carbon aerogel electrode; p鈭抧 heterojunction; electrosorption-assisted visible light photocatalysis; trichlorophenol&qsSearchArea=searchText">2,4,6-trichlorophenol; degradation mechanism; intermediate products