可见光驱动Ag_3PO_4催化剂的可控制备及活性评价

Controlled synthesis and activity evaluation of visible-light-driven Ag_3PO_4 catalyst

以AgNO3和Na3PO4、Na2HPO4、NaH2PO4为原料,采用简易液相沉淀法可控制备3种Ag3PO4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Na3PO4、Na2HPO4、NaH2PO4制备Ag3PO4,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Na2HPO4为原料可获取高产率、高活性Ag3PO4光催化剂。真实太阳光照射下,Ag3PO4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。

Three Ag3PO4photocatalysts were controlled synthesized via a facile precipitation method using AgNO3and Na3PO4,Na2HPO4,NaH2PO4as raw materials. The samples were characterized by XRD,FESEM,UV-Vis,FTIR and BET. The photocatalytic activities of three Ag3PO4samples were evaluated for RhB degradation using visible light. Using Na3PO4,Na2HPO4and NaH2PO4to prepared Ag3PO4,the degree of crystallinity of sample was gradually increased,and the particle size was increased,the reaction rate constant for RhB degradation over the as-obtained Ag3PO4sample was 0. 03,0. 10,0. 15 min- 1,respectively. Na2HPO4As raw materials,the as-obtained Ag3PO4photocatalyst with higher yield exhibited the excellent photocatalytic activity. Under natural sunlight irradiation,the Ag3PO4photocatalyst could be reused. The photocatalytic activity of the photocatalyst decreased when Ag0were produced during the photocatalytic process.