Ag3PO4/Au/TiO2纳米片异质结薄膜的制备及其光催化性能研究

Preparation and property of heterostructured Ag3PO4/Au/TiO2 NSF photocatalyst

以钛片(Ti)、氯金酸(HAuCl4)和硝酸银(AgNO3)为主要原料,采用碱热法、微波辅助化学还原法和浸渍-沉积法三步法制备了磷酸银(Ag3PO4)/金(Au)/二氧化钛纳米片(TiO2NSF)异质结薄膜(Ag3PO4/Au/TiO2NSF)光催化剂,并对其进行了表征,探究了其在模拟太阳光条件下降解水相中有机染料亚甲基蓝(MB)和清除气相中氮氧化物(NOx)的性能。结果表明,在模拟太阳光光照140min条件下,Ag3PO4/1.0Au/TiO2NSF对MB的去除率达到99.9%;在模拟太阳光照射条件下,Ag3PO4/1.0Au/TiO2NSF对NO的光催化转化率达到98.2%。采用捕获剂确定空穴(h^+)是主要的活性物种,超氧自由基(·O2^-)是次要活性物种。Z机制和Au纳米粒子的局域表面等离子体共振效应的协同作用是复合光催化剂催化性能增强的主要原因。

Heterostructured silver phosphate/gold/titanium dioxide nano-sheet film(Ag3PO4/Au/TiO2NSF)photocatalyst was prepared by the alkali thermal method,chemical reduction method with microwave heating and impregnatingdeposition method utilizing Ti disc,chloroauric acid and silver nitrate as main raw materials.The products were characterized,and investigated their photocatalytic performances for degradation of organic dyes methylene blue(MB)in the aqueous phase and removal nitrogen oxides(NOx)in the gas phase.The results showed that the MB removal rate could reach 99.9% by using Ag3PO4/1.0Au/TiO2NSF within 140min under simulated solar irradiation,and the NO conversion rate was 98.2%.The results also suggested that holes(h^+)played the major role and superoxide radical(·O2^-)was the secondary active species by the experiments of photogenerated active species trapped.Furthermore,the photocatalytic activity enhancement of Ag3PO4/Au/TiO2NSF may be ascribed to the synergistic effects of Z-scheme and the local surface plasmon resonance effect of Au nanoparticles.