Abstract
The construction of double Z-scheme heterojunctions has significant merits in facilitating photogenerated charge migration and realizing efficient redox reduction. In this work, a dual Z-scheme heterojunction Bi4Ti3O12/Bi4O5I2/Bi12TiO20 (BT/BOI/BTO) with abundant oxygen vacancies is constructed to achieve multi-channel rapid charge transfer. The transport modes of the charges at the interface of the double Z-scheme of BT/BOI/BTO are investigated through detailed analysis of the Fermi energy levels, energy band structures, and electron spin resonance spectra. Dual Z-scheme heterojunction generates a dual-interface electric field on Bi4Ti3O12 nanosheets. Carriers are driven to migrate directionally along multiple channels. Effective activation of oxygen molecules by oxygen vacancies in BT/BOI/BTO. BT/BOI/BTO achieved 100 % removal of tetracycline hydrochloride (TCH) compared to the original material. The detailed degradation pathways of TCH were elucidated by liquid chromatography-mass spectrometry (LC-MS) analysis. This work presents a new insight into the construction of high-performance Z-scheme photocatalysts with multichannel charge transfer properties.
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