CuS Nanosheet Decorated Bi5O7I Composite for the Enhanced Photocatalytic Reduction Activity of Aqueous Cr(VI)

doi:10.15541/jim20200356

Abstract

Abstract:

Photocatalytic approach has been extensively explored to remove toxic Cr(VI) in wastewater owing to its high efficient, safe and low cost features. Fabricating semiconductor composite is supposed to be an effective approach to improve the poor photocatalytic activity of single component. In this work, we prepared CuS nanosheets decorated Bi₅O₇I composites by a simple hydrothermal method, and characterized and evaluated its photoatalytic reduction activity of Cr(VI) under the visible-light irradiation. Compared to pure Bi₅O₇I microrods and CuS nanoparticles, the as-prepared CuS/Bi₅O₇I composites exhibits more efficient photocatalytic reduction of aqueous Cr(VI). The reaction rate constant of 15wt% CuS/Bi₅O₇I catalyst was 20 times and 4.3 times of that of pristine Bi₅O₇I and CuS, respectively. BET, photoluminescence and EIS spectra measurement demonstrate that the improved photocatalytic activity may be attributed to their higher surface areas, broader light absorption region, improved separation, and transfer efficiency of photo-induced electron-hole pairs. Moreover, a possible photocatalytic mechanism of CuS/Bi₅O₇I catalyst is also proposed.

Key words: CuS/Bi₅O₇I composite photocatalyst, visible-light photocatalyst, photocatalytic reduction of Cr(VI)

CLC Number:

O614

CAI Miao, CHEN Zihang, ZENG Shi, DU Jianghui, XIONG Juan. CuS Nanosheet Decorated Bi₅O₇I Composite for the Enhanced Photocatalytic Reduction Activity of Aqueous Cr(VI)[J]. Journal of Inorganic Materials, 2021, 36(6): 665-672.

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References 29

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CuS Nanosheet Decorated Bi₅O₇I Composite for the Enhanced Photocatalytic Reduction Activity of Aqueous Cr(VI)

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