Ag3PO4催化剂的简易制备及其降解罗丹明B的研究

Facile Preparation of Ag3PO4 and Its Photocatalytic Propreties of Rhodamine B

以硝酸银和十二水合磷酸氢二钠为原料合成了Ag3PO4催化剂,并在可见光下研究其对罗丹明B的光催化降解性能。通过X射线衍射仪、纳米激光粒度仪及紫外可见分光光度计对催化剂进行了表征,并考察了不同的光照时间、催化剂用量、罗丹明B初始浓度,以及丙二酸、乙二胺四乙酸、过氧化氢的加入对光催化性能的影响。结果表明,当Ag3PO4催化剂用量为30 mg,罗丹明B浓度为10 mg/L,过氧化氢用量为1 mL时光催化效果最好,罗丹明B的降解率高达98.6%;加入过氧化氢后,Ag3PO4催化剂对罗丹明B的降解速率提高了约20个百分点,降解完全所需时间缩短了约三分之一;加入丙二酸和乙二胺四乙酸后,Ag3PO4催化剂对罗丹明B的降解率显著降低,表明羟基自由基·OH和空穴H+可能是Ag3PO4可见光催化剂的主要活性物质。

Ag3PO4 visible light photocatalyst was prepared by the precipitation method and using AgNO3 and Na2HPO4.12H2O as raw materials.The visible light photocatalyst property on rhodamine B(RB)was studied.The structure of photocatalyst was characterized by XRD,laser particle sizer and UV-Vis DRS.The influence of the photocatalytic activity by many factors such as illumination time,the amount of catalyst,RB initial concentration,also adding of malonic acid,ethylenediamine tetraacetic acid,hydrogen peroxide on photocatalytic property was researched.The results shown that when the amount of catalyst Ag3PO4 is 30 mg,the initial concentration of RB is 10 mg/L,hydrogen peroxide dosage is 1 mL,the light photocatalyst effect is the best,the photo-catalytic degradation rate of RB can reach 98.6%.After the addition of hydrogen peroxide,the degradation rate of RB by the Ag3PO4 catalyst increased by about 20 percentage points,and the time for completely degradation was advanced by one third.The degradation rate of RB is significantly reduced when adding malonic acid,ethylenediamine tetraacetic acid,indicating that hydroxyl radicals·OH and holes H+may be the main active materials of the Ag3PO4 visible light catalyst.