Design of a novel Cu₂O/TiO₂/carbon aerogel electrode and its efficient electrosorption-assisted visible light photocatalytic degradation of 2,4,6-trichlorophenol.
Cu(2)O/TiO(2) heterojunction photocatalyst is built on carbon aerogel (CA) substrate with good adsorption properties by sol impregnation and seed-mediated synthesis approach. The Cu(2)O/TiO(2)/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-vis diffuse reflectance spectra show that the optical absorption edge for Cu(2)O/TiO(2)/CA appears at 636 nm. Under visible-light (λ > 420 nm) irradiation, the photocurrent density increment on Cu(2)O/TiO(2)/CA is 60 times of that on Cu(2)O/TiO(2)/FTO. The electrochemical characteristic is investigated with electrochemical impedance spectrum (EIS). The Cu(2)O/TiO(2)/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 Cu(2)O/TiO(2)/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 Cu(2)O/TiO(2)/CA is also studied.
Department of Chemistry, Tongji University, Siping Road 1239, Shanghai 200092, PR China.
Yabo
Y
Wang
Ya-Nan
YN
Zhang
Guohua
G
Zhao
Hongyi
H
Tian
Huijie
H
Shi
Tianchen
T
Zhou
D000327:Adsorption; D001673:Biodegradation, Environmental; D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D002733:Chlorophenols / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D003300:Copper / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods; D004566:Electrodes; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D005782:Gels / Q000737:chemistry; D008855:Microscopy, Electron, Scanning / Q000379:methods; D046529:Microscopy, Electron, Transmission / Q000379:methods; D008956:Models, Chemical; D010777:Photochemistry / Q000379:methods; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction / Q000379:methods
D002733:Chlorophenols; D005782:Gels; C009495:titanium dioxide; D002244:Carbon; D003300:Copper; D014025:Titanium; C024564:2,4,6-trichlorophenol; C030973:cupric oxide