Facile Synthesis of g-C 3 N 4 /TiO 2 /Hectorite Z-Scheme Composite and Its Visible Photocatalytic Degradation of Rhodamine B.

Autor: You, Rong, Chen, Jinyang, Hong, Menghan, Li, Jinrui, Hong, Xiaomin
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Zdroj: Materials (1996-1944); 11/1/2020, Vol. 13 Issue 22, p5304, 1p
Abstrakt: A novel g-C3N4/TiO2/hectorite Z-scheme composites with oxygen vacancy (Vo) defects and Ti3+ were synthesized by so-gel method and high temperature solid phase reaction. This composite exhibited high visible photo-catalytic degradation of rhodamine B (RhB). The apparent rate constant of g-C3N4/TiO2/hectorite was 0.01705 min−1, which is approximately 5.38 and 4.88 times that of P25 and g-C3N4, respectively. The enhancement of photo-catalytic efficiency of the composites can be attributed to the great light harvesting ability, high specific surface area and effective separation of electrons(e−) and holes(h+). The F element from Hectorite causes the formation of Vo and Ti3+ in TiO2, making it responsive to visible light. The effective separation of e− and h+ mainly results from Z-scheme transfer of photo-produced electrons in g-C3N4/TiO2 interface. The composites can be easily recycled and the degradation rate of the RhB still reached 84% after five cycles, indicating its good reusability. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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