紫外光芬顿-膜分离耦合体系降解金霉素

以金霉素为降解对象,采用沉淀法制备α-FeOOH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-FeOOH和光催化陶瓷膜进行表征.结果表明催化剂α-FeOOH呈针状或纺锤长片状,长宽分别为500~550nm、25~50nm,经α-FeOOH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/cm².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.

Study on degradation of chlortetracycline by photo-Fenton ceramic membrane coupling system

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.