Au/Ag3PO4光催化清除氮氧化物

Photocatalytic Removal of Nitrogen Oxides by Au/Ag3PO4

采用沉淀-化学还原法制备了Au/Ag3PO4光催化剂,通过XRD、SEM、EDS、UV-Vis和PL对其进行了表征和分析,探讨了Au负载量对其性能的影响,并考察了其在模拟太阳光下对气相中NOx的光催化清除性能。结果表明,Au/Ag3PO4在Au纳米粒子的肖特基势垒和局域表面等离子共振效应共同作用下,其光利用率高、光生载流子复合几率低;在模拟太阳光下,最优光催化剂0.1Au/Ag3PO4的NO转化率和NOx清除率分别为47.08%和32.22%,动力学常数是Ag3PO4的1.57倍,其光催化稳定性明显优于Ag3PO4。

We prepared Au/Ag3PO4 photocatalyst via a precipitation-chemical reduction method,characterized and analyzed the Au/Ag3PO4 photocatalyst by X-ray diffraction(XRD),scanning electron microscopy(SEM),energy-dispersive X-ray spectroscopy(EDS),ultraviolet-visible diffuse reflection spectroscopy(UV-Vis),and photoluminescence spectroscopy(PL).Moreover,we discussed the effect of Au load capacity on the performance of the Au/Ag3PO4 photocatalyst,and investigated the photocatalytic removal performance of the Au/Ag3PO4 photocatalyst for NOx in the gas phase under simulated sunlight.The results show that the Au/Ag3PO4 photocatalyst has high light efficiency and low photocarrier recombination rate because of the effects of Schottky barrier and local surface plasmon resonance of Au nanoparticles.By using 0.1Au/Ag3PO4 as the optimal photocatalyst,the NO conversion rate and the NOx removal rate are 47.08%and 32.22%,respectively,under the simulated sunlight.The kinetic constant of 0.1Au/Ag3PO4 is 1.57 times that of Ag3PO4,and its photocatalytic stability is obviously better than that of Ag3PO4.