【摘要】 以大比表面的廉价易得的凹凸棒(palygorskite)为载体,借助带电荷界面的静电调控作用,采用吸附-沉积沉淀方法制备磷酸银/凹凸棒(Ag3PO4/palygorskite)复合催化剂.利用X-射线衍射仪(XRD)、场发射扫描电子显微镜(FE-SEM)、原子吸收光谱(AAS)、紫外可见漫反射光谱(UV-Vis DRS)等技术系统地表征催化剂.之所以能够制备高分散性的凹凸棒负载的磷酸银催化剂,主要是因为凹凸棒具有较大的比表面积、带负电荷界面以及适宜的磷酸根前驱体.以可见光催化脱色降解罗丹明B和氧化降解异丙醇为探针反应,考察复合材料的催化性能.研究表明,与纯磷酸银相比,磷酸银/凹凸棒催化脱色降解罗丹明B和氧化降解异丙醇速率分别提高了2和2.5倍.更多还原

【Abstract】 Ag3PO4/ palygorskite composite was prepared by an in situ electrostatic adsorption-deposition-precipitation method and characterized by field emission scanning electron microscope( FE-SEM),X-ray diffraction( XRD),UV-Vis diffuse reflection,and BET surface measurements techniques. The layer negative charge and larger specific surface area of palygorskite,along with the suitable PO43-precursor,could mainly account for high dispersity of Ag3PO4 on the surface of fibrous palygorskite. The activity of the composites was evaluated by the decolorization of the cationic Rohdamine B( Rh B) dye and the degradation of 2-propanol under visible light irradiation. The rate of Rh B decolorization and 2-propanol degradation over Ag3PO4/ palygorskite was about 2 and 2. 5times faster than that of the corresponding bare Ag3PO4,respectively.更多还原