Facile One-Step Hydrothermal Fabrication of (Sr0.6Bi0.305)2Bi2O7/SnO2 Heterojunction with Excellent Photocatalytic Activity

Di Zhu; Xinling Wang; Huiting An; Yan Zhong; Dianhui Wang; Chengying Tang; Chaohao Hu

doi:10.3390/nano10020321

Facile One-Step Hydrothermal Fabrication of (Sr_0.6Bi_0.305)₂Bi₂O₇/SnO₂ Heterojunction with Excellent Photocatalytic Activity

Nanomaterials (Basel). 2020 Feb 13;10(2):321. doi: 10.3390/nano10020321.

Authors

Di Zhu¹, Xinling Wang¹, Huiting An¹, Yan Zhong^{1

2}, Dianhui Wang^{1

2}, Chengying Tang^{1

2}, Chaohao Hu^{1

2}

Affiliations

¹ School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China.
² Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China.

Abstract

The pyrochlore-type (Sr_0.6Bi_0.305)₂Bi₂O₇ (SBO), containing Bi³⁺ and Bi⁵⁺ mixed valent states, was recently found to be used as a new visible light responsive photocatalyst. Novel SBO/SnO₂ heterostructured composites were synthesized through a facile one-step hydrothermal method. The phase structure, morphology, chemical composition, and optical properties of the obtained samples were characterized by XRD, SEM, TEM, XPS, and UV-vis DRS. Compared to pure SBO and SnO₂, the synthesized SBO/SnO₂ composites exhibited significantly enhanced photocatalytic efficiency. The results indicated that the photoinduced holes and superoxide radicals play a dominant role and are the main reactive species during the degradation of Methylene Blue (MB) solution under visible light irradiation. Heterojunctions, formed in samples, directly contribute to the improvement of photocatalytic efficiency of SBO/SnO₂ composites, since it not only broadens the light response range, but also accelerates the separation of photogenerated carriers.

Keywords: (Sr0.6Bi0.305)2Bi2O7; (Sr0.6Bi0.305)2Bi2O7/SnO2; heterojunction; hydrothermal method; photocatalytic activity.

Abstract

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