TiO2/pg-C3N4复合催化剂的制备及光催化性能

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Abstract

The porous TiO₂/pg-C₃N₄ composite photocatalyst was successfully prepared by combining ultrasonic with hydrothermal treatment. XRD, SEM, TEM, UV-Vis DRS and PL were applied to analyze its morphology, structure and optical properties. The photocatalytic activities of the as-prepared samples were evaluated by degradating the simulated pollutants (RhB, MO) in aqueous solution under simulated sunlighti llumination. The result showed that the TiO₂/pg-C₃N₄ (5:100) exhibited the best photocatalytic degradation performance among all photocatalists with different compositions. The photocatalytic degradation pathway of RhB was chromophore cleavage caused by O₂^- and h⁺. The improved photocatalytic performance of TiO₂/pg-C₃N₄ (5:100) was attributed to the fact that the active sites of the photocatalytic reaction were increased due to the porous structure, on the one hand, and a Z-scheme type heterojunction was formed between TiO₂ and pg-C₃N₄ on the other hand, which not only can increase the separation efficiency of electron-hole pairs, but also can retain the stronger reducibility of photo-generated electrons on the more negative CB of pg-C₃N₄ and higher oxidationability of photo-generated holes on the more positive VB of TiO₂, compared with the conventional type II heterojunction.

Key words： graphitic carbon nitride TiO₂/pg-C₃N₄ heterojunction porous structure photocatalysis

Received: 05 May 2019

PACS:

X703.5

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	Articles by authors
	GUO Mei
	REN Xue-chang
	WANG Jian-zhao
	KANG Yun
	MENG Yue

Cite this article:

GUO Mei,REN Xue-chang,WANG Jian-zhao等. Preparation and photocatalytic properties of TiO₂/pg-C₃N₄ composite photocatalyst[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(12): 5119-5125.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I12/5119

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