Nanometer CeO2 doped high silica ZSM-5 heterogeneous catalytic ozonation of sulfamethoxazole in water

Xingtao Zuo; Senlin Ma; Qiyuan Wu; Juan Xiong; Jiajie He; Cong Ma; Zhongbing Chen

doi:10.1016/j.jhazmat.2021.125072

Nanometer CeO₂ doped high silica ZSM-5 heterogeneous catalytic ozonation of sulfamethoxazole in water

J Hazard Mater. 2021 Jun 5:411:125072. doi: 10.1016/j.jhazmat.2021.125072. Epub 2021 Jan 7.

Authors

Xingtao Zuo¹, Senlin Ma², Qiyuan Wu³, Juan Xiong⁴, Jiajie He³, Cong Ma⁵, Zhongbing Chen⁶

Affiliations

¹ College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China. Electronic address: xingtaozuo@aliyun.com.
² China Gezhouba Group Eco-Environmental Engineering Company Limited, Wuhan 430000, China.
³ College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.
⁴ College of Science, Huazhong Agricultural University, Wuhan 430070, China.
⁵ School of Environmental and Chemical Engineering, Tiangong University, Tianjin 300387, China.
⁶ Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Prague 16500, Czech Republic.

PMID: 33453668
DOI: 10.1016/j.jhazmat.2021.125072

Abstract

A novel CeO₂ doped high silica ZSM-5(CeO₂@HSZSM-5) composite was originally fabricated via ammonia precipitation for the catalytic ozonation of sulfamethoxazole (SMX). Physicochemical properties have been investigated through electron microscope, Raman spectroscopy, X-ray photoelectron spectroscopy, etc. The prepared nanometer CeO₂@HSZSM-5 had a much higher specific surface (348-395 m²/g), a finer crystallite size (8.2-33.5 nm) and superior stability. Temperature-programmed desorption and reduction analysis revealed that the formed CeO₂ nanoparticles on the surface of CeO₂@HSZSM-5 could improve the reducibility of surface-capping oxygen, induce more oxygen vacancies and promote oxygen migration. CeO₂@HSZSM-5 exhibited excellent catalytic performance for SMX mineralization in the pH range of environmental waters. The great enhancement of CeO₂@HSZSM-5 catalytic activity was ascribed to the conversion of O₃ into active oxygen involved in SMX mineralization, including ^.OH, O₂^.- and ¹O₂. This work provides a reference for the removal of pollutants by zeolite supported Ce catalytic ozonation process in water.

Keywords: Catalytic ozonation; Cerium oxide; High silica ZSM-5; SMX; TOC removal.

Publication types

Research Support, Non-U.S. Gov't