Integrating Plasmonic Nanoparticles with TiO2 Photonic Crystal for Enhancement of Visible-Light-Driven Photocatalysis
Integrating Plasmonic Nanoparticles with TiO2 Photonic Crystal for Enhancement of Visible-Light-Driven Photocatalysis
复制标题
将等离子体纳米粒子与 TiO2 光子晶体集成以增强可见光驱动的光催化作用
DOI：
10.1021/es202669y
复制
发表时间：
2012-02-07
影响因子：
11.4
通讯作者：
Zhao, Huimin
中科院分区：
文献类型：
--
作者：
Lu, Ying;Yu, Hongtao;Zhao, Huimin
为了通过强化光捕获来增强光催化作用，通过将金纳米粒子渗透到 TiO2 光子晶体（TiO2 PC/Au NPs）中制备了一种新型光催化剂。扫描电子显微镜（SEM）和透射电子显微镜（TEM）图像显示，平均直径约为15 nm的Au NPs均匀地分散在多孔TiO2材料中。透射光谱结果表明，Au NPs 渗透到由 240 nm 聚苯乙烯球制成的 TiO2 240 中后，光吸收被放大。在可见光（λ > 420 nm）照射下降解2,4-二氯苯酚的光催化实验中，使用TiO2 240/Au NPs的动力学常数比使用TiO2纳米晶/Au NPs（TiO2 NC/Au NPs）的动力学常数大2.3倍。优异的光催化性能得益于Au NPs的局域表面等离子体共振协同增强的光捕获，扩大了光响应光谱，而TiO2 240的光子效应增强了Au NPs的等离子体吸收。羟基自由基源自溶解氧与光生电子通过链式反应的电还原，是负责污染物降解的主要活性氧。
Aimed at enhancing photocatalysis through intensifying light harvesting, a new photocatalyst was fabricated by infiltrating Au nanopartides into TiO2 photonic crystals (TiO2 PC/Au NPs). Scanning electron microscopy (SEM) and transmission electron microscope (TEM) images showed that the Au NPs with average diameter around 15 nm were dispersed uniformly into the porous TiO2 material. The results of the transmittance spectra demonstrated that the light absorption by Au NPs was amplified after they were infiltrated into TiO2 240, which was fabricated from 240 nm polystyrene spheres. In the photocatalytic experiments of 2,4-dichlorophenol degradation under visible light (lambda > 420 nm) irradiation, the kinetic constant using TiO2 240/Au NPs was 2.3 fold larger than that using TiO2 nanocrystalline/Au NPs (TiO2 NC/Au NPs). The excellent photocatalysis benefited from the cooperatively enhanced light harvesting owing to the localized surface plasmon resonance of Au NPs, which extended the light response spectra and the photonic effect of the TiO2 240 which intensified the plasmonic absorption by Au NPs. The hydroxyl radicals originated from the electroreduction of dissolved oxygen with photogenerated electrons via chain reactions were the main reactive oxygen species responsible for the pollutant degradation.