MIL-100(Fe)光芬顿催化剂的制备与循环使用研究

Preparation of MIL-100(Fe)photo-fenton catalysts and their recyclability

为解决金属有机框架MIL-100(Fe)粉末在实际工业应用中难以回收重复利用的难题,采用水热法合成了MIL-100(Fe)粉末,利用真空抽滤法将其负载到氧化铝多孔陶瓷片上,制备了MIL-100(Fe)@多孔陶瓷复合材料。利用场发射扫描电子显微镜能谱联用仪(FE-SEM-EDS)、X射线衍射仪(XRD)、比表面积分析仪(BET)、紫外可见光分光光度计(UV-VIS)等仪器对MIL-100(Fe)及复合材料的结构与性能进行了表征;以罗丹明B(RhB)溶液模拟染料废水,研究了在MIL-100(Fe)在H_(2)O_(2)反应体系中对染料的光芬顿降解能力。结果表明,MIL-100(Fe)呈现八面体结构,比表面积高达1152.75 m^(2)/g,当反应温度为60℃、H_(2)O_(2)的初始浓度为0.5 g/L、RhB溶液的初始浓度为20 mg/L时,RhB溶液的降解率达到99.26%。MIL-100(Fe)@多孔陶瓷在循环使用5次时,对RhB溶液的降解率仍达到98%以上,循环使用稳定性良好,具有商业化应用前景。

In order to solve the problem of metal-organic framework MIL-100(Fe)powder which was difficult to be recycled and reused in industrial applications,this paper synthesized MIL-100(Fe)powder by a hydrothermal method.The MIL-100(Fe)@porous ceramic composites were prepared by loading the powder on alumina porous ceramic using vacuum filtration method.The structure and properties of the MIL-100(Fe)and composites were characterized by using field emission scanning electron microscope-energy spectrometer(FE-SEM-EDS),X-ray diffractometer(XRD),specific surface area analyzer(BET),and ultraviolet-visible spectrophotometer(UV-VIS).The photo-Fenton-degradation abilities in the H_(2)O_(2)reaction system were investigated by simulating the dye wastewater with rhodamine B(RhB)solution.Results showed that the MIL-100(Fe)presented an octahedral structure with a specific surface area as high as 1152.75 m^(2)/g.When the reaction temperature was 60℃,the initial concentration of H_(2)O_(2)was 0.5 g/L and the initial concentration of RhB solution was 20 mg/L,the degradation rate of RhB solution reached 99.26%.When the MIL-100(Fe)@porous ceramic composites were recycled for 5 times,the degradation rate of RhB solution still reached more than 98%.The composites present excellent recyclability and had promising for commercialization application.