Photophysical and Photocatalytic Properties of BiSnSbO₆ Under Visible Light Irradiation

Overview

Journal Materials (Basel)

Publisher MDPI

Date 2018 Mar 29

PMID 29587420

Citations 2

Authors

Jingfei Luan

Panqi Huang

Affiliations

Soon will be listed here.

Abstract

BiSnSbO₆ with strong photocatalytic activity was first fabricated by a high-temperature, solid-state sintering method. The resulting BiSnSbO₆ was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (DRS) and X-ray photoelectron spectroscopy (XPS). The results showed that BiSnSbO₆, with a pyrochlore structure and a cubic crystal system by a space group Fd3m, was well crystallized. The lattice parameter or the band gap of BiSnSbO₆ was 10.234594 Å or 2.83 eV. Compared with N-doped TiO₂, BiSnSbO₆ showed higher photocatalytic activity in the degradation of benzotriazole and rhodamine B. The apparent first-order rate constant for BiSnSbO₆ in the degradation of benzotriazole and rhodamine B was 0.0182 min and 0.0147 min, respectively. On the basis of the scavenger experiment, during the photocatalytic process, the main active species were arranged in order of increasing photodegradation rate: •OH < •O₂ < h⁺. The removal rate of benzotriazole or rhodamine B was approximately estimated to be 100% with BiSnSbO₆ as a photocatalyst after 200 min visible-light irradiation. Plentiful CO₂ produced by the experiment indicated that benzotriazole or rhodamine B was continuously mineralized during the photocatalytic process. Finally, the possible photodegradation pathways of benzotriazole and rhodamine B were deduced.

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