可见光驱动 Ag3PO4催化剂的可控制备及活性评价

摘要

Three Ag3 PO4 photocatalysts were controlled synthesized via a facile precipitation method using AgNO3 and Na3 PO4 ,Na2 HPO4 ,NaH2 PO4 as raw materials. The samples were characterized by XRD,FE-SEM,UV-Vis,FTIR and BET. The photocatalytic activities of three Ag3 PO4 samples were evaluated for RhB degradation using visible light. Using Na3 PO4 ,Na2 HPO4 and NaH2 PO4 to prepared Ag3 PO4 ,the de-gree of crystallinity of sample was gradually increased,and the particle size was increased,the reaction rate constant for RhB degradation over the as-obtained Ag3 PO4 sample was 0. 03,0. 10,0. 15 min - 1 ,re-spectively. Na2 HPO4 As raw materials,the as-obtained Ag3 PO4 photocatalyst with higher yield exhibited the excellent photocatalytic activity. Under natural sunlight irradiation,the Ag3 PO4 photocatalyst could be reused. The photocatalytic activity of the photocatalyst decreased when Ag0 were produced during the pho-tocatalytic process.%以 AgNO3和 Na3 PO4、Na2 HPO4、NaH2 PO4为原料，采用简易液相沉淀法可控制备3种 Ag3 PO4光催化剂，采用 XRD、FE-SEM、UV-Vis、FTIR 及 BET 表征。以罗丹明 B 为目标污染物，评价样品的可见光催化活性。结果表明，采用 Na3 PO4、Na2 HPO4、NaH2 PO4制备 Ag3 PO4，样品的结晶度逐渐增加，粒径逐渐增大，3种样品均能吸收可见光，去除水体中罗丹明 B 的反应速率常数分别为0.03，0.10，0.15 min -1。以 Na2 HPO4为原料可获取高产率、高活性Ag3 PO4光催化剂。真实太阳光照射下，Ag3 PO4光催化剂可重复利用。单质银的产生降低了催化剂的光催化活性。