Synthesis, Characterization and Photocatalytic Activity of New Photocatalyst ZnBiSbO4 under Visible Light Irradiation

International Journal of Molecular Sciences

Jingfei Luan¹  Mengjing Chen² 

[1] State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China;

关键词: ZnBiSbO₄;    indigo carmine;    photocatalytic degradation;    visible light irradiation;    photodegradation pathway;   

DOI  :  10.3390/ijms15069459

来源: mdpi

【 摘 要 】

In this paper, ZnBiSbO₄ was synthesized by a solid-state reaction method for the first time. The structural and photocatalytic properties of ZnBiSbO₄ had been characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, transmission electron microscope and UV-visible spectrometer. ZnBiSbO₄ crystallized with a pyrochlore-type structure and a tetragonal crystal system. The band gap of ZnBiSbO₄ was estimated to be 2.49 eV. The photocatalytic degradation of indigo carmine was realized under visible light irradiation with ZnBiSbO₄ as a catalyst compared with nitrogen-doped TiO₂ (N-TiO₂) and CdBiYO₄. The results showed that ZnBiSbO₄ owned higher photocatalytic activity compared with N-TiO₂ or CdBiYO₄ for the photocatalytic degradation of indigo carmine under visible light irradiation. The reduction of the total organic carbon, the formation of inorganic products, SO₄²⁻ and NO₃⁻, and the evolution of CO₂ revealed the continuous mineralization of indigo carmine during the photocatalytic process. One possible photocatalytic degradation pathway of indigo carmine was obtained. The phytotoxicity of the photocatalytic-treated indigo carmine (IC) wastewater was detected by examining its effect on seed germination and growth.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.