Organic semiconductor g-C3N4 modified TiO2 nanotube arrays for enhanced photoelectrochemical performance in wastewater treatment
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g-C3N4 sensitized TiO2 nanotube arrays (g-C3N4/TNTs) were fabricated by a simple solid sublimation and transition (SST) method using urea as precursor. The photoelectrochemical (PEC) performances were evaluated in this work. It is proposed that the g-C3N4 layer can play dual roles: surface sensitization and passivation of TNTs surface trap states to inhibit charge recombination. The g-C3N4/TNTs exhibited significantly improved PEC performance compared with TNTs under blue light (460 nm) irradiation. The g-C3N4/TNTs prepared from 3 g urea showed the highest photocurrent density of ca. 65 μA cm-2, which is almost 10 times as high as that of TNTs. Furthermore, g-C3N4/TNTs showed enhanced photoelectrocatalytic degradation of methylene blue (MB) under the blue light irradiation. The stable performance of degradation of MB in the multicycle tests suggests that the hybrid g-C3N4/TNTs electrode could be used as a low-cost photoelectrode material in wastewater treatment process.
Liu , L , Zhang , G , Irvine , J T S & Wu , Y 2015 , ' Organic semiconductor g-C 3 N 4 modified TiO 2 nanotube arrays for enhanced photoelectrochemical performance in wastewater treatment ' Energy Technology , vol 3 , pp. 982-988 . DOI: 10.1002/ente.201500114
Copyright 2015 The Authors. Published by Wiley-VCH Verlag GmbH &Co. KGaA.This is an open accessarticle under the terms of the Creative CommonsAttribution License, which permits use,distribution and reproduction inany medium, provided the original work is properly cited.
This work was supported by China Scholarship Council (CSC), Royal Society of Edinburgh (RSE) and Engineering and Physical Sciences Research Council (EPSRC). Date of Acceptance: 27/05/2015
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