Enhancing photocatalytic activity on gas-phase heavy metal oxidation with self-assembled BiOI/BiOCl microflowers

Xiaoming Sun; Jia Lu; Jiang Wu; Dayong Guan; Qizhen Liu; Naiqiang Yan

doi:10.1016/j.jcis.2019.03.049

Enhancing photocatalytic activity on gas-phase heavy metal oxidation with self-assembled BiOI/BiOCl microflowers

J Colloid Interface Sci. 2019 Jun 15:546:32-42. doi: 10.1016/j.jcis.2019.03.049. Epub 2019 Mar 15.

Authors

Xiaoming Sun¹, Jia Lu², Jiang Wu³, Dayong Guan⁴, Qizhen Liu⁵, Naiqiang Yan⁶

Affiliations

¹ College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China; Environmental Science and Engineering College, Shanghai Jiao Tong University, Shanghai 200240, China.
² College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China.
³ College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, China. Electronic address: wjcfd2002@163.com.
⁴ College of Electric and Information Engineering, Tongji University, Shanghai 200092, China.
⁵ Shanghai Environment Monitoring Center, Shanghai 200030, China.
⁶ Environmental Science and Engineering College, Shanghai Jiao Tong University, Shanghai 200240, China.

PMID: 30901690
DOI: 10.1016/j.jcis.2019.03.049

Abstract

A one-pot synthetic approach to prepare self-assembled BiOI/BiOCl microflowers by a template-free coprecipitation method at room temperature has been developed. The physicochemical structure of BiOI/BiOCl microflowers were characterized using transmission electron microscopy (TEM), high resolution TEM (HRTEM), scanning electron microscopy (SEM). The composition information and bonding energy structure of the BiOI/BiOCl microflowers were studied by X-ray diffraction (XRD) and high-resolution X-ray photoelectron spectra (XPS), Fourier Transform Infrared Spectroscopy (FTIR), UV-vis diffuse reflectance spectroscopy (DRS) analysis and photoluminescence (PL) spectra. The photocatalytic performance of as-prepared BiOI/BiOCl microflowers was tested through photocatalytic oxidation of gas-phase mercury, as a useful catalyst (or additive) in wet electrostatistic precipitator (WESP) to capture heavy metals including mercury. The results show that the prepared BiOI/BiOCl samples demonstrate higher photocatalytic efficiency than pure BiOI or BiOCl. By optimizing the component ratio of the BiOI and BiOCl, up to 72.2% oxidation efficiency can be achieved in BiOI/BiOCl microflowers. Finally, the photocatalytic influence of BiOI/BiOCl microflowers on gas-phase mercury oxidation had been proposed.

Keywords: BiOI/BiOCl; Heavy metal; Microflower heterostructure; Template-free coprecipitation; Wet electrostatistic precipitator.