Luo Lisha, Sun Zhiyu, Chen Yuxi, Zhang Hui, Sun Yinkun, Lu Dongwei, Ma Jun
Jilin Institute of Chemical Technology Jilin 130022 P. R. China.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology Harbin 150090 PR China
RSC Adv. 2023 Jan 11;13(3):1906-1913. doi: 10.1039/d2ra06714e. eCollection 2023 Jan 6.
A low-cost natural silicate ore supported FeO (FeSO) was synthesized for catalytic ozonation of sulfamethoxazole (SMX). XRD, SEM-EDS, BET, FTIR and XPS results of the FeSO catalyst confirmed that the natural silicate ore was successfully modified with iron oxide. The effects of key factors, such as catalyst dosage, initial solution pH, reaction temperature, inorganic anions and initial concentration, on ozonation degradation were systemically investigated. The degradation rate of SMX (20 mg L) was 88.1% after 30 min, compared with only 35.1% SMX degradation rate in the absence of the catalyst, and the total organic carbon (TOC) removal reached 49.1% after 60 min. Reaction mechanisms revealed that surface hydroxyl groups of FeSO were a critical factor for hydroxyl radical (˙OH) production leading to fast SMX degradation in the ozone decomposition process. The degradation products were detected, and the possible pathways of SMX were then proposed. This study provides guidance for preparing a low-cost catalyst and analyzing the degradation products and pathways of SMX in the ozonation process, which is of significance in practical industrial applications.
合成了一种低成本的天然硅酸盐矿石负载的FeO（FeSO）用于催化臭氧化磺胺甲恶唑（SMX）。FeSO催化剂的XRD、SEM-EDS、BET、FTIR和XPS结果证实天然硅酸盐矿石已成功用氧化铁改性。系统研究了催化剂用量、初始溶液pH值、反应温度、无机阴离子和初始浓度等关键因素对臭氧化降解的影响。30分钟后，SMX（20mg/L）的降解率为88.1%，而在无催化剂时SMX的降解率仅为35.1%，60分钟后总有机碳（TOC）去除率达到49.1%。反应机理表明，FeSO的表面羟基是导致臭氧分解过程中SMX快速降解的羟基自由基（˙OH）产生的关键因素。检测了降解产物，并提出了SMX可能的降解途径。该研究为制备低成本催化剂以及分析臭氧化过程中SMX的降解产物和途径提供了指导，在实际工业应用中具有重要意义。
