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

A novel CeO doped high silica ZSM-5(CeO@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 CeO@HSZSM-5 had a much higher specific surface (348-395 m/g), a finer crystallite size (8.2-33.5 nm) and superior stability. Temperature-programmed desorption and reduction analysis revealed that the formed CeO nanoparticles on the surface of CeO@HSZSM-5 could improve the reducibility of surface-capping oxygen, induce more oxygen vacancies and promote oxygen migration. CeO@HSZSM-5 exhibited excellent catalytic performance for SMX mineralization in the pH range of environmental waters. The great enhancement of CeO@HSZSM-5 catalytic activity was ascribed to the conversion of O into active oxygen involved in SMX mineralization, including OH, O and O. This work provides a reference for the removal of pollutants by zeolite supported Ce catalytic ozonation process in water.