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结合回流法和原位沉淀法成功制备磷酸银/矾酸铋(Ag3PO4/BiVO4)复合光催化剂.通过X射线衍射(XRD)、场发射扫描电子显微镜(FESEM)、能量色散X射线光谱(EDS)、紫外-可见漫反射光谱(UV-Vis DRS)及光致发光(PL)光谱对制备样品进行表征.XRD和FESEM结果表明成功制备Ag3PO4/BiVO4复合光催化剂.采用节能发光二极管灯(LED)作为可见光光源,在低消耗光催化系统中评价制备样品可见光催化降解染料的活性.当Ag3PO4和BiVO4的组成摩尔比为1:3时,复合Ag3PO4/BiVO4光催化剂呈现出高于纯相Ag3PO4的催化活性,可减少Ag3PO4的使用量.Ag3PO4/BiVO4复合光催化剂在中性溶液中表现出高活性,同时证实其对阳离子染料的光催化降解效果强于阴离子染料.在Ag3PO4/BiVO4系统中,超氧自由基和空穴是主要的活性物种.经过三次循环利用,Ag3PO4/BiVO4复合催化剂的可见光催化活性表现出不同程度的降低,归因于降解过程中产生金属银.
The silver phosphate / bismuth vanadate (Ag3PO4 / BiVO4) composite photocatalyst was successfully prepared by the combination of reflow method and in-situ precipitation method. The properties of the composite photocatalyst were characterized by X-ray diffraction, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy (EDS) , UV-Vis DRS and PL spectroscopy were used to characterize the prepared samples.The results of XRD and FESEM indicated that Ag3PO4 / BiVO4 composite photocatalyst was prepared successfully.An energy-saving light-emitting diode (LED) Visible light source was used to evaluate the photocatalytic activity of the prepared samples in low-consumption photocatalytic system.When the molar ratio of Ag3PO4 to BiVO4 was 1: 3, the photocatalytic activity of the composite Ag3PO4 / BiVO4 photocatalyst was higher than that of the pure phase Ag3PO4 , Can reduce the amount of Ag3PO4 Ag3PO4 / BiVO4 composite photocatalyst showed high activity in neutral solution, at the same time confirmed its photocatalytic degradation of cationic dyes stronger than anionic dyes.In Ag3PO4 / BiVO4 system, superoxide free Base and hole are the main active species.After three cycles of recycling, the visible light photocatalytic activity of Ag3PO4 / BiVO4 composite catalyst shows different degrees of reduction, due to the degradation process Metallic silver.