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Fabrication of a TiO2 trapped meso/macroporous g-C3N4 heterojunction photocatalyst and understanding its enhanced photocatalytic activity based on optical simulation analysis

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Abstract

A TiO2 trapped meso/macroporous g-C3N4 heterojunction (mm-CNT) photocatalyst is fabricated by hydrolysis and sintering of tetrabutyl titanate on meso/macroporous g-C3N4 prepared via a facile hard template method. TiO2 nanoparticles are highly dispersed and some of them are trapped in the pores of meso/macroporous g-C3N4. The photocatalytic performance of mm-CNT is assessed through degradation of Rhodamine B solution under visible light irradiation, which displays much better photocatalytic performance than that over pristine meso/macroporous g-C3N4 and pristine g-C3N4. Based on the characterization results, it is reasonable to believe that the enhanced photocatalytic activity should be attributed to the unique meso/macroporous architecture and heterojunction structure, which results in improved mass transfer and enhances the separation efficiency of exciton dissociation. Besides, an optical simulation is initially utilized to study the optical absorption characteristics of mm-CNT since the optical absorption ability of a photocatalyst is one of the most important aspects influencing the photocatalytic ability. As a result, the enhanced ability of light absorption observed on the heterojunctions should be also favorable to achieve improved photocatalytic performances. On account of the analysis results, a possible photocatalytic mechanism for enhanced visible light photocatalytic activity is proposed.

Graphical abstract: Fabrication of a TiO2 trapped meso/macroporous g-C3N4 heterojunction photocatalyst and understanding its enhanced photocatalytic activity based on optical simulation analysis

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Publication details

The article was received on 27 Nov 2017, accepted on 18 Dec 2017 and first published on 19 Dec 2017


Article type: Research Article
DOI: 10.1039/C7QI00751E
Citation: Inorg. Chem. Front., 2018, Advance Article
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    Fabrication of a TiO2 trapped meso/macroporous g-C3N4 heterojunction photocatalyst and understanding its enhanced photocatalytic activity based on optical simulation analysis

    W. Wu, X. Li, Z. Ruan, Y. Li, X. Xu, Y. Yuan and K. Lin, Inorg. Chem. Front., 2018, Advance Article , DOI: 10.1039/C7QI00751E

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