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首页> 外文期刊>Environmental Science & Technology >Integrating Plasmonic Nanoparticles with TiO_2 Photonic Crystal for Enhancement of Visible-Light-Driven Photocatalysis
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Integrating Plasmonic Nanoparticles with TiO_2 Photonic Crystal for Enhancement of Visible-Light-Driven Photocatalysis

机译：将等离子纳米粒子与TiO_2光子晶体集成在一起，以增强可见光驱动的光催化作用

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摘要

Aimed at enhancing photocatalysis through intensifying light harvesting, a new photocatalyst was fabricated by infiltrating Au nanoparticles into TiO_2 photonic crystals (TiO_2 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 TiO_2 material. The results of the transmittance spectra demonstrated that the light absorption by Au NPs was amplified after they were infiltrated into TiO_2 240, which was fabricated from 240 nm polystyrene spheres. In the photocatalytic experiments of 2,4-dichIorophenol degradation under visible light (X > 420 nm) irradiation, the kinetic constant using TiO_2 240/Au NPs was 2.3 fold larger than that using TiO_2 nanocrystalMne/Au NPs (TiO_2 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 TiO_2 240 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.
机译：为了通过增强光的收集来增强光催化作用，通过将金纳米粒子浸入TiO_2光子晶体（TiO_2PC / Au NPs）中制备了一种新型的光催化剂。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15 nm的金纳米颗粒均匀分散在多孔TiO_2材料中。透射光谱的结果表明，Au NPs渗透到由240 nm聚苯乙烯球制成的TiO_2 240中后，其吸收的光被放大。在可见光（X> 420 nm）照射下2,4-二氯苯酚降解的光催化实验中，使用TiO_2 240 / Au NPs的动力学常数比使用TiO_2纳米晶体Mne / Au NPs（TiO_2 NC / Au NPs）的动力学常数大2.3倍。 。 Au NPs的局部表面等离振子共振可协同提高集光效率，从而发挥了优异的光催化作用，扩展了光响应谱和TiO_2 240的光子效应，增强了Au NPs的等离子体吸收。溶解氧与光生电子通过链反应电还原而产生的羟基自由基是造成污染物降解的主要活性氧。

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  • 来源
    《Environmental Science & Technology》 |2012年第3期|p.1724-1730|共7页
  • 作者

    Ying Lu; Hongtao Yu; Shuo Chen; Xie Quan; Huimin Zhao;

  • 作者单位

    Key Laboratory of Industrial Ecology and Environment Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, People's Republic of China;

    Key Laboratory of Industrial Ecology and Environment Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, People's Republic of China;

    Key Laboratory of Industrial Ecology and Environment Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, People's Republic of China;

    Key Laboratory of Industrial Ecology and Environment Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, People's Republic of China;

    Key Laboratory of Industrial Ecology and Environment Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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