介孔 TiO2/碳催化臭氧化降解对氯硝基苯。

Mesoporous TiO/carbon catalytic ozonation for degradation of p-chloronitrobenzene.

机构信息

Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China.

College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China and Sichuan Ecological and Environmental Monitoring Center, Chengdu 610091, China.

出版信息

Water Sci Technol. 2019 Sep;80(5):902-910. doi: 10.2166/wst.2019.331.

DOI:10.2166/wst.2019.331

PMID:31746797

Abstract

In this study, a mesoporous TiO/carbon catalyst (TiO/C) was prepared by a facile impregnation-carbonization approach to catalyze ozonation of p-chloronitrobenzene (p-CNB). The catalyst was well characterized and the catalytic efficiency under various conditions was systematically evaluated. TiO/C has a disordered mesostructure with a high specific surface area. 92.8% of p-CNB (2 μmol/L) can be degraded within 20 min in the TiO/C/O system in the presence of 1 mg/L O, 100 mg/L catalyst, at pH = 5. Based on the evaluation of the effect of basic parameters, it could be deduced that the removal of p-CNB relied on the synthetic effect of catalysis by TiO/C and the autocatalytic induction of p-CNB. The removal efficiency of p-CNB, the structure change and the leaching of Ti ions were also evaluated in five cycles, indicating TiO/C is stable and recyclable for catalytic ozonation in water treatment.

摘要

在这项研究中，通过简便的浸渍碳化法制备了介孔 TiO/碳催化剂（TiO/C），用于催化臭氧氧化对氯硝基苯（p-CNB）。对催化剂进行了很好的表征，并系统评估了各种条件下的催化效率。TiO/C 具有无序的介孔结构和高比表面积。在 TiO/C/O 体系中，当存在 1 mg/L 的 O、100 mg/L 的催化剂和 pH = 5 时，2 μmol/L 的 p-CNB 可在 20 分钟内降解 92.8%。通过评估基本参数的影响，可以推断出 p-CNB 的去除依赖于 TiO/C 的催化合成效应和 p-CNB 的自催化诱导。还在五个循环中评估了 p-CNB 的去除效率、结构变化和 Ti 离子的浸出，表明 TiO/C 在水处理中的催化臭氧氧化中稳定且可回收。