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Template-free preparation of macro/mesoporous g-C3N4/TiO2 heterojunction photocatalysts with enhanced visible light photocatalytic activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
45085 46396 2016 12 PDF Available
Title
Template-free preparation of macro/mesoporous g-C3N4/TiO2 heterojunction photocatalysts with enhanced visible light photocatalytic activity
Abstract

•Macro/mesoporous g-C3N4/TiO2 heterojunction photocatalysts were successfully prepared.•The C3N4 content had an important influence on photocatalytic activity.•The enhanced photocatalytic activity was due to high surface area and heterostructure.•A possible enhanced photocatalytic mechanism was proposed.

Mesoporous photocatalytic materials with macroporous structures have attracted more and more attention because of their textural mesopores and intrinsic interconnected pore networks, which are able to efficiently transport guest species to framework binding sites. In this work, macro/mesoporous g-C3N4/TiO2 heterojunction photocatalysts were fabricated without templates or additives by a facile calcination method using tetrabutyl titanate and melamine as the feedstocks. Photocatalytic experiments of the as-prepared samples were measured by the photocatalytic oxidation degradation of RhB solution at room temperature under visible light irradiation. The results indicated that the melamine content in the precursors had an important influence on photocatalytic activity of the as-prepared samples. At the optimal loading content, the apparent reaction rate constant (k) was 47.8 × 10−3 min−1 for RhB degradation, exceeding that of pure TiO2 (6.6 × 10−3 min−1) and g-C3N4 (15.2 × 10−3 min−1) by factor of 7.2 and 3.1 respectively. The improved photocatalytic activity was attributed to high surface area and heterostructure formation of g-C3N4/TiO2 composites. The trapping experiment results showed that O2− and h+ were main active species in the decomposition of RhB. A possible enhanced photocatalytic mechanism of g-C3N4/TiO2 heterojunction photocatalysts was proposed.

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Keywords
Template-free; Macro/mesoporous; Heterojunction; Visible light; g-C3N4/TiO2; Photocatalytic activity
First Page Preview
Template-free preparation of macro/mesoporous g-C3N4/TiO2 heterojunction photocatalysts with enhanced visible light photocatalytic activity
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 187, 15 June 2016, Pages 47–58
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis