Liu Zhimeng, Zhu Mengfu, Wang Zheng, Wang Hong, Deng Cheng, Li Kui
Institute of Medical Equipment, Academy of Military Medical Sciences, Tianjin 300161, China.
State Key Laboratory of Hollow Fiber Membrane Materials and Processes, School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China.
Materials (Basel). 2016 May 12;9(5):364. doi: 10.3390/ma9050364.
In this work, an electrocatalytic membrane was prepared to degrade aqueous tetracycline (TC) using a carbon membrane coated with nano-TiO₂ via a sol-gel process. SEM, XRD, EDS, and XPS were used to characterize the composition and structure of the electrocatalytic membrane. The effect of operating conditions on the removal rate of tetracycline was investigated systematically. The results show that the chemical oxygen demand (COD) removal rate increased with increasing residence time while it decreased with increasing the initial concentration of tetracycline. Moreover, pH had little effect on the removal of tetracycline, and the electrocatalytic membrane could effectively remove tetracycline with initial concentration of 50 mg·L (pH, 3.8-9.6). The 100% tetracycline and 87.8% COD removal rate could be achieved under the following operating conditions: tetracycline concentration of 50 mg·L, current density of 1 mA·cm, temperature of 25 °C, and residence time of 4.4 min. This study provides a new and feasible method for removing antibiotics in water with the synergistic effect of electrocatalytic oxidation and membrane separation. It is evident that there will be a broad market for the application of electrocatalytic membrane in the field of antibiotic wastewater treatment.
在本工作中，通过溶胶 - 凝胶法制备了一种涂覆有纳米TiO₂的碳膜电催化膜，用于降解四环素（TC）水溶液。采用扫描电子显微镜（SEM）、X射线衍射仪（XRD）、能谱仪（EDS）和X射线光电子能谱仪（XPS）对电催化膜的组成和结构进行了表征。系统研究了操作条件对四环素去除率的影响。结果表明，化学需氧量（COD）去除率随停留时间的增加而升高，随四环素初始浓度的增加而降低。此外，pH值对四环素的去除影响较小，该电催化膜能有效去除初始浓度为50 mg·L（pH值为3.8 - 9.6）的四环素。在四环素浓度为50 mg·L、电流密度为1 mA·cm、温度为25℃、停留时间为4.4 min的操作条件下，四环素去除率可达100%，COD去除率可达87.8%。本研究为利用电催化氧化和膜分离的协同作用去除水中抗生素提供了一种新的可行方法。显然，电催化膜在抗生素废水处理领域的应用将具有广阔的市场。
