Construction of novel MoS2@COF-Ph heterojunction photocatalysts for boosted photocatalytic efficiency and hydrogen production performance under sunlight. Issue 8 (1st July 2022)

• Record Type: Journal Article
• Authors: Dong, Bowen; Wan, Yuqi; Cheng, Qingrong; Zhou, Hong; Pan, Zhiquan
• Is Part Of: Environmental science. Volume 9:Issue 8(2022)
• Page Start: 2799
• Page End: 2814
• Publication Date: 2022-07-01
• Subjects: Environmental sciences -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d2en00278g
• Languages: English
• ISSNs: 2051-8153

Abstract

Abstract : We assemble COF-Ph on MoS2 nanospheres to form a unique interface for high-efficiency photocatalytic degradation of tetracycline, producing hydrogen under sunlight. The Z-scheme heterojunction mechanism promoted the separation of photocarriers to greatly improve performance. Abstract : Heterojunction photocatalysts have been regarded as effective materials for photocatalysis. In this paper, because of the peculiar structure and characteristics of covalent organic frameworks (COFs), a novel nano-MoS2 @COF-Ph heterojunction photocatalyst was synthesized via a simple and easy solvothermal reaction. The nano-MoS2 @COF-Ph heterostructure displayed more high-efficiency photocatalytic performance than pure MoS2 and pure COF-Ph in the degradation of tetracycline and hydrogen production under sunlight. The excellent photocatalytic performance of the heterojunction photocatalyst was primarily attributed to: (i) the π-conjugation system of COF-Ph and (ii) the efficient photogenerated charge separation and transfer by the compact interface contact of the MoS2 nanospheres and COF-Ph. It is worth mentioning that the formation of coordination bonds between the MoS2 nanospheres and COF-Ph provided a transfer channel for photogenerated carriers. Derived from the active free radical capture experiments and ESR tests, a reasonable Z-scheme electron transfer mechanism was proposed, which can account for the enhanced photocatalytic capability of the photocatalytic system. The photocatalytic performance of the heterojunction photocatalyst was studied, and its structure was entirely characterized by SEM, TEM, BET, FT-IR, XPS and PXRD. This study provides a promising viable strategy to design a high-efficiency photocatalyst to remove contaminants from the environment and produce clean energy.