Abstract
In this study, a novel Zn2SnO4/BiOBr hybrid photocatalyst was prepared via a mild hydrothermal synthesis combined with a chemical deposition method. The morphological structure, chemical composition, crystal structure, and optical properties were comprehensively characterized by a series of measurement techniques. Morphological observation showed that fine Zn2SnO4 nanoparticles were anchored on the nanoplate surface of a flower-like BiOBr 3D hierarchical structure. The experimental results of UV-vis diffuse reflection spectroscopy revealed that the visible-light absorptive capacity of the Zn2SnO4/BiOBr hybrid photocatalyst was promoted, as compared to that of pure Zn2SnO4. Evidenced by electro-negativity theoretical calculation, Zn2SnO4 and BiOBr possessed matched band edges for accelerating photogenerated charge separation at the interface. The Zn2SnO4/BiOBr hybrid photocatalyst exhibited enhanced photocatalytic performance in the degradation of Rhodamine B (RhB) under visible light irradiation. According to the band energy structure and the experimental results, the enhanced photocatalytic performance was ascribed to the improved visible-light absorptive capacity and the contact interface between Zn2SnO4 nanoparticles and BiOBr nanoplates, being able to favor the prompt charge migration and suppress the recombination of photogenerated carriers in the hybrid system.
Highlights
Nowadays, photocatalysis is considered to be an effective and sustainable approach for resolving the disturbing issue of the energy crisis and environmental pollution
The photodegradation of rhodamine B (RhB) [6], methyl blue [7,8], methyl orange [9], and direct black 38 azo-dye [10] was successfully achieved over ZTO nanostructured photocatalysts under UV irradiation
The existence of pores and the interface between ZTO and BiOBr are favorable for visible light harvesting and the transfer of photoinduced electron-hole pairs
Summary
Photocatalysis is considered to be an effective and sustainable approach for resolving the disturbing issue of the energy crisis and environmental pollution. The photodegradation of rhodamine B (RhB) [6], methyl blue [7,8], methyl orange [9], and direct black 38 azo-dye [10] was successfully achieved over ZTO nanostructured photocatalysts under UV irradiation. Besides these examples, as reported in the previous literature [11], the photocatalytic. The spectral response of bare ZTO nanostructured photocatalysts is still limited to UV region, and the utilization efficiency of solar energy is not desirable for the low portion of UV light in the total solar energy. The proposed mechanism of the enhanced photocatalytic performance was discussed based on the experimental results and energy band structure analysis
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