4.7 Article

Construction of g-C3N4 based heterojunction photocatalyst by coupling TiO2-SnO2 solid solution for efficient multipurpose photocatalysis

期刊

JOURNAL OF ALLOYS AND COMPOUNDS
卷 864, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.158132

关键词

Thermodynamic modulation; g-C3N4; TiO2-SnO2 solution; Heterojunction; Multipurpose photocatalysis

资金

  1. National Natural Science Foundation of China [21663006, 21763003]
  2. Program for Science and Technology Development Plan of Nanning [20163146]

向作者/读者索取更多资源

Designing and synthesizing g-C3N4@TiO2-SnO2 nanocomposites can lead to highly efficient photocatalysts for pollutant removal and H-2 evolution. The improved photoactivity of the composite is mainly attributed to enhanced electron-hole separation and apt modulation of thermodynamic properties.
Designing g-C3N4 based heterojunction photocatalyst by coupling wide-bandgap semiconductors not only promote the increased charge separation but also can provide the opportunity of aptly modulating its thermodynamic properties. Herein, g-C3N4@TiO2-SnO2 nanocomposites has been judiciously designed and is followed to synthesize by a straightforward hydrothermal method. Essentially, g-C3N4 was integrated with TiO2-SnO2 solid solution, composed of two phases (anatase (A) and rutile (R)) to fabricate the g-C3N4@TiO2-SnO2 nanocomposites. The hybrid nanocomposite is utilized as a highly efficient multipurpose photocatalyst for pollutant removal (Methyl orange, Rhodamine B, Cr6+) and H-2 evolution under visible/solar light irradiation. The reaction rate constant (k) values for the pollutant removal using this newly prepared g-C3N4@TiO2 -SnO2 nanocomposite is found to be 14.4, 5.6 and 9 times higher than that of TiO2-SnO2, g-C3N4, and the physical mixture, respectively. The H-2 evolution rate of g-C3N4@TiO2-SnO2 (220 mu mol h(-1) g(-1)) is also evaluated to be about 10 times higher than that of g-C3N4 (22 mu mol h(-1) g(-1)). The improved photoactivity of g-C3N4@TiO2-SnO2 nanocomposites is attributed to the improved electron-hole separation and the apt modulation of thermodynamic properties. (C) 2020 Elsevier B.V. All rights reserved.

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