Experimental method to explore the adaptation degree of type-II and all-solid-state Z-scheme heterojunction structures in the same degradation system

doi:10.1016/S1872-2067(19)63495-9

Abstract

Abstract: TiO₂ nanoparticles were prepared using the hydrothermal method and modified with C₃N₄ to synthesize a Type-II heterojunction semiconductor photocatalyst, TiO₂-C₃N₄. In addition, a carbon layer was coated onto the TiO₂ nanoparticles and the obtained material was uniformly covered on the surface of C₃N₄ to form an all-solid-state Z-scheme semiconductor photocatalyst, TiO₂-C-C₃N₄. Through characterization by XRD, XPS, SEM, TEM, BET, photoelectrochemical experiments, UV-visible diffuse reflection, and PL spectroscopy, the charge transfer mechanism and band gap positions for the composite photocatalysts were analyzed. The Type-II and all-solid-state Z-scheme heterojunction structures were compared. By combining microscopic internal mechanisms with macroscopic experimental phenomena, the relationship between performance and structure was verified. Experimental methods were used to explore the adaptation degree of different photocatalytic mechanisms using the same degradation system. This study highlights effective photocatalyst design to meet the requirements for specific degradation conditions.

Key words: TiO₂-C₃N₄, TiO₂-C-C₃N₄, Photodegradation, Type-II heterojunction semiconductor, Z-scheme heterojunction structure semiconductor

Zheao Huang, Shuo Zhao, Ying Yu. Experimental method to explore the adaptation degree of type-II and all-solid-state Z-scheme heterojunction structures in the same degradation system[J]. Chinese Journal of Catalysis, 2020, 41(10): 1522-1534.

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