为了减轻抗生素等各种污染物对水资源的污染,不可避免地需要进行废水处理。MOFs是具有光催化活性的新型材料。在这项研究中,通过对其合成路线的修改,优化了铈基MOF(Ce-MOF)对四环素(TC)的超声催化降解。Ce-MOF合成室温(RT),热液(HT),和声化学合成(SC)进行了研究。TC降解实验揭示了SC合成的优越性。主要合成参数的相互作用,即,初始配体浓度,超声(US)功率和时间对Ce-MOF,利用中心复合实验设计(CCD)通过响应面方法模型(RSM)进行了研究。最佳的SC合成条件是配体的初始浓度为8.4mmol/L,50振幅的超声处理能力,和美国时间60分钟。通过红外光谱对最佳合成的Ce-MOF进行了表征,FTIR,XRD,FE-SEM,TEM,zeta电位分析,漫反射光谱,粒度分析,Mott-Schottky分析,光电流分析,电化学阻抗谱,和光致发光光谱。结果表明,在初始TC浓度为120ppm和1g/LCe-MOF的水溶液中,在pH为7的条件下,TC的去除效率在120min内可以达到81.75%。根据COD测量,该工艺的矿化效率为71%。Ce-MOF催化剂保留了其化学稳定性,并在TC降解后保持活性,这使其成为废水处理的有希望的候选物。
Wastewater treatment is inevitably required to alleviate the pollution of water resources by various contaminants such as antibiotics. MOFs are novel materials with photocatalytic activities. In this study, sonophotocatalytic degradation of tetracycline (TC) by the Cerium-based MOF (Ce-MOF) is optimized by modification of its synthesis route. Ce-MOF synthesis by room temperature (RT), hydrothermal (HT), and sonochemical synthesis (SC) are studied. TC degradation experiments revealed the superiority of SC synthesis. The interplay of main synthesis parameters, namely, initial ligand concentration, ultrasound (US) power and time on sonophotocatalytic activity of Ce-MOF, were investigated by response surface methodology model (RSM) utilizing the central composite experimental design (CCD). The optimum SC synthesis conditions are an initial ligand concentration of 8.4 mmol/L, a sonication power of 50 amplitude, and a US time of 60 min. The optimally synthesized Ce-MOF was characterized by infrared spectroscopy, FTIR, XRD, FE-SEM, TEM, zeta potential analysis, diffuse reflectance spectroscopy, particle size analysis, Mott-Schottky analysis, photocurrent analysis, electrochemical impedance spectra, and photoluminescence spectroscopy. The findings indicate that the removal efficiency of TC can reach up to 81.75% within 120 min in an aqueous solution containing an initial TC concentration of 120 ppm and 1 g/L Ce-MOF at pH of 7. Mineralization efficiency of the process is 71% according to COD measurements. The Ce-MOF catalyst retained its chemical stability and remained active upon TC degradation which makes it a promising candidate for wastewater treatment.