College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.
China Gezhouba Group Eco-Environmental Engineering Company Limited, Wuhan 430000, China.
J Hazard Mater. 2021 Jun 5;411:125072. doi: 10.1016/j.jhazmat.2021.125072. Epub 2021 Jan 7.
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.
一种新型的 CeO 掺杂高硅 ZSM-5（CeO@HSZSM-5）复合材料是通过氨沉淀法制备的，用于催化臭氧化磺胺甲恶唑（SMX）。通过电子显微镜、拉曼光谱、X 射线光电子能谱等手段对其进行了物理化学性质的研究。所制备的纳米 CeO@HSZSM-5 具有更高的比表面积（348-395 m/g）、更细的晶粒尺寸（8.2-33.5nm）和更好的稳定性。程序升温脱附和还原分析表明，CeO@HSZSM-5 表面形成的 CeO 纳米颗粒可以提高表面封端氧的还原能力，诱导更多的氧空位，并促进氧的迁移。CeO@HSZSM-5 在环境水样的 pH 值范围内对 SMX 的矿化具有优异的催化性能。CeO@HSZSM-5 催化活性的显著提高归因于 O 转化为参与 SMX 矿化的活性氧，包括 OH、O 和 O。这项工作为沸石负载 Ce 催化臭氧化工艺在水中去除污染物提供了参考。
