可见光驱动AgCl/Ag_3PO_4复合材料的制备及活性评价

Synthesis and Activity Evaluation of Visible-light-driven AgCl /Ag_3PO_4 Composite Materials

以AgNO3、Na2HPO4和NaCl为原料,采用简易离子交换法制备可见光驱动AgCl/Ag3PO4复合材料,利用XRD、EDX、FESEM、UV-vis等测试手段对其进行表征。低能耗LED灯为可见光光源,阳离子染料罗丹明B和阴离子染料甲基橙为探针,评价AgCl/Ag3PO4复合材料的光催化活性。调节NaCl加入量实现AgCl/Ag3PO4复合材料中AgCl含量的调控。AgCl/Ag3PO4复合材料可实现对水体中罗丹明B和甲基橙的降解,尤其是对罗丹明B的高效去除。NaCl用量为1 mmol时制备AgCl/Ag3PO4复合材料可见光催化降解罗丹明B和甲基橙的活性强于Ag3PO4,且循环使用效率高。AgCl/Ag3PO4可见光催化反应体系中的活性物种为超氧自由基和空穴,其中空穴占主导地位。

Visible-light-driven AgCL/Ag3PO4 composite materials were synthesized by a facile ion- exchange method using AgNO3, Na2HPO4 and NaCI as raw materials. The as-obtained samples were characterized by XRD, EDX, FESEM and UV-vis. The photocatalytic activities of AgC1/AgaPO4 composite materials were evaluated in the degradation of rhodamine （RhB, a cationic dye） and methyl orange （MO, an anionic dye） using low-energy LED lamp as visible light source. The results revealed that the content of AgC1 in AgC1/Ag3PO4 sample could be controlled by adjusting the addition amount of NaC1. Under visible light irradiation, RhB and MO were degraded by AgC1/Ag3PO4 composite materials in water, especially, RhB can be completely removed. When lmmol NaC1 was added in the synthesis process, the as-synthesized AgC1/Ag3PO4 sample showed higher photocatalytic activity for RhB and MO degradation than pure Ag3PO4 sample, and AgCL/Ag3PO4 reactive species in AgCl/Ag3PO4 photocatalytic system were played the major role. sample could be reused efficiently. The superoxide radicals and holes, and holes