Preparation and sonophotocatalytic performance of hierarchical Bi2WO6 structures and effects of various factors on the rate of Rhodamine B degradation

Liuying Liang; Yalkunjan Tursun; Aisha Nulahong; Talifu Dilinuer; Awuti Tunishaguli; Ge Gao; Abulizi Abulikemu; Kenji Okitsu

doi:10.1016/j.ultsonch.2017.03.054

Preparation and sonophotocatalytic performance of hierarchical Bi₂WO₆ structures and effects of various factors on the rate of Rhodamine B degradation

Ultrason Sonochem. 2017 Nov:39:93-100. doi: 10.1016/j.ultsonch.2017.03.054. Epub 2017 Apr 5.

Authors

Liuying Liang¹, Yalkunjan Tursun¹, Aisha Nulahong¹, Talifu Dilinuer¹, Awuti Tunishaguli¹, Ge Gao¹, Abulizi Abulikemu², Kenji Okitsu³

Affiliations

¹ Key Laboratory of Coal Conversion & Chemical Engineering Process (Xinjiang Uyghur Autonomous Region), College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, PR China.
² Key Laboratory of Coal Conversion & Chemical Engineering Process (Xinjiang Uyghur Autonomous Region), College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, PR China. Electronic address: aablek@xju.edu.cn.
³ Graduate School of Humanities and Sustainable System Sciences, Osaka Prefecture University, Osaka 599-8531, Japan. Electronic address: okitsu@mtr.osakafu-u.ac.jp.

PMID: 28733022
DOI: 10.1016/j.ultsonch.2017.03.054

Abstract

Hierarchical Bi₂WO₆ structures with high surface area were prepared in the presence of polyvinylpyrrolidone by using an optimized hydrothermal method. The samples prepared were characterized by X-ray diffraction, field-emission scanning electron microscopy and N₂ adsorption-desorption technique. The results of these characterizations showed the formation of the hierarchical Bi₂WO₆ structures with high surface area (51m²/g). The degradation of Rhodamine B (RhB) with or without visible light was investigated under various experimental conditions to evaluate the sonophotocatalytic activity of the hierarchical Bi₂WO₆ structures. The result showed that the degradation efficiency was found to be in the following order: sonocatalysis<photocatalysis<sonophotocatalysis. The effects of various experimental factors such as light intensity, ultrasound pulse mode and catalyst dosage on the sonophotocatalysis efficiency were also investigated. Under the optimum condition (light intensity 140W, ultrasound pulse mode: 9s on/1s off, Bi₂WO₆ catalyst dosage: 1.25g/L), the excellent sonophotocatalytic activity on the degradation of RhB was observed: the degradation ratio achieved about 99.5% at 40min. The mechanism of the sonophotocatalysis was also proposed.

Keywords: Bi(2)WO(6); Polyvinylpyrrolidone; Rhodamine B; Sonophotocatalysis; Visible light.