摘要
以金霉素为降解对象,采用沉淀法制备α-Fe OOH光催化剂,进一步将其用共价结合法负载在陶瓷膜上,用SEM、XRD、EDS、UV-Vis和FTIR对α-Fe OOH和光催化陶瓷膜进行表征.结果表明催化剂α-Fe OOH呈针状或纺锤长片状,长宽分别为500~550nm、25~50nm,经α-Fe OOH改性的陶瓷膜孔隙率由14.83%变为8.11%.研究光芬顿陶瓷膜耦合体系对金霉素的降解效率和动力学行为,确定了光芬顿陶瓷膜耦合体系的最优降解条件为金霉素初始浓度50mg/L,H2O2投加浓度10mmol/L,UV强度为3796.6μW/cm^2.进一步利用UV-Vis光谱分析了两种体系对金霉素的降解机理,光催化剂体系下,H2O2的浓度基本保持不变,而光芬顿陶瓷膜耦合体系下H2O2的浓度先升后降,同时后者在同一时间点对TOC和NH4+-N去除率更高,表明光芬顿陶瓷膜耦合体系氧化能力更强,对金霉素的降解更为彻底.
Rutheniummycin was used as the degradation target,and theα-FeOOH photocatalyst was prepared by precipitation method,and further loaded on the ceramic membrane by covalent bonding method and characterization ofα-FeOOH and photocatalytic ceramic membranes by SEM,XRD,EDS,UV-Vis and FTIR.The results showed that the catalystα-FeOOH was acicular or spindle-shaped,with a length and width of 500~550nm and 25~50nm,respectively.The porosity of the ceramic membrane modified byα-FeOOH is changed from 14.83%to 8.11%.The degradation efficiency and kinetic behavior of fentanyl ceramic membrane coupling system were studied.The optimal degradation conditions of the photo-Fenton ceramic membrane coupling system were determined as the initial concentration of chlortetracycline 50mg/L,H2O2 concentration 10mmol/L,UV intensity 3796.6μW/cm^2.The degradation mechanism of chlortetracycline in the two systems was further analyzed by UV-Vis spectroscopy.Under the photocatalyst system,the concentration of H2O2 remained basically unchanged,while the concentration of H2O2 in the photo-Fenton ceramic membrane coupling system first rose and then decreased,and the latter had higher removal rates of TOC and NH4^+-N at the same time point,indicating that the photo-Fenton ceramic membrane coupling system has stronger oxidizing ability and more complete degradation of chlortetracycline.
作者
姚宏
向鑫鑫
薛宏慧
孙绍斌
张旭
鲁垠涛
张战胜
YAO Hong;XIANG Xin-xin;XUE Hong-hui;SUN Shao-bin;ZHANG Xu;LU Yin-tao;ZHANG Zhan-sheng(School of Civil Engineering and Architecture,Beijing Jiaotong University,Beijing 100044,China;Beijing International Scientific and Technological Cooperation Base for Antibiotics and Resistance Gens Control,Beijing 100044,China;Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard,Beijing 100044,China;Chinese Academy of Environmental Planning,Beijing 100012,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2020年第4期1577-1585,共9页
China Environmental Science
基金
中央高校基本科研业务费资助专项(2019JBM406)。
关键词
非均相光芬顿
金霉素
陶瓷膜
膜分离
降解机理
heterogeneous photofenton
chlortetracycline
ceramic membrane
membrane separation
degradation mechanism
