Study on degradation of chlortetracycline by photo-Fenton ceramic membrane coupling system
YAO Hong1,2,3, XIANG Xin-xin1,2,3, XUE Hong-hui1,2,3, SUN Shao-bin1,2,3, ZHANG Xu1,2,3, LU Yin-tao1,2,3, ZHANG Zhan-sheng4
1. School of Civil Engineering and Architecture, Beijing Jiaotong University, Beijing 100044, China;
2. Beijing International Scientific and Technological Cooperation Base for Antibiotics and Resistance Gens Control, Beijing 100044, China;
3. Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing 100044, China;
4. Chinese Academy of Environmental Planning, Beijing 100012, China
Rutheniummycin was used as the degradation target, and the α-FeOOH photocatalyst was prepared by precipitation method, and further loaded on the ceramic membrane by covalent bonding method and characterization of α-FeOOH and photocatalytic ceramic membranes by SEM, XRD, EDS, UV-Vis and FTIR. The results showed that the catalyst α-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 by α-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/cm2. 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.
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