Ag_3PO_4/Palygorskite的静电调控合成及可见光催化降解罗丹明B和气相异丙醇

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.

Visible light induced Rh B decolorization and 2-propanol degrdation over Ag3PO4/Palygorskite synthesized through electrstatic attractions

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 2.5 times faster than that of the corresponding bare Ag3PO4, re-spectively.