TiO_(2)-Ag纳米复合材料的制备及其光电催化性能研究

Preparation and Photoelectrocatalytic Properties Study of TiO_(2)-Ag Nanocomposites

载流子在等离激元金属纳米粒子上的快速复合,导致传统的光电催化剂效率显著降低,通过金属和半导体的复合可实现热电子和空穴的分离以提升光电催化效率。采用Ag纳米粒子与半导体TiO_(2)纳米粒子复合提高其光电催化活性,并探索了催化活性提升的机理,研究了TiO_(2)-Ag纳米复合材料之间空间电荷区能带弯曲以及内置电场的作用,为设计高性能SPR光电催化剂提供理论和实验依据。以对氨基苯硫酚(PATP)及对硝基苯硫酚(PNTP)的光电催化偶联反应为探针,研究了TiO_(2)-Ag纳米复合材料的催化性能。结果表明TiO_(2)的引入提高了Ag的SPR催化活性,其主要原因是TiO_(2)的引入可提高TiO_(2)-Ag间电子和空穴的分离效率。

The rapid recombination of carriers on plasmon metal nanoparticles significantly decreases the efficiency of traditional photocatalysts.The separation of hot electrons and holes can be achieved by recombining metal and semiconductors,improving the efficiency of photocatalysis.This paper combined Ag and TiO_(2)nanoparticles to improve the photocatalytic activity.The enhanced mechanism of the catalytic activity was explored.The effect of energy band bending in the space charge region between TiO_(2)-Ag nanocomposites and the built-in electric field was studied,which provided a theoretical and experimental basis for designing high-performance SPR photocatalysts.Furthermore,the photocatalysis coupling reaction of PATP and PNTP was employed to study the catalytic performance of TiO_(2)-Ag nanocomposites.The results reveal that the introduction of TiO_(2)improves the SPR catalytic activity of Ag.The main reason is that introducing TiO_(2)can improve the separation efficiency of electrons and holes between TiO_(2)and Ag.