SPR增强贵金属M嵌入空盒TiO_(2)纳米反应器制备及其可见光降解RhB  

Preparation of SPR-enhanced precious metal M-embedded TiO_(2) hollow nanoboxes photoreactor and degradation of RhB by visible light

作　　者：刘欢 刘芷含 冉兰 庞凯琳 陈连清[1] LIU Huan;LIU Zhi-han;RAN Lan;PANG Kai-in;CHEN Lian-qing(College of Chemistry and Materials Science,South-Central Minzu University,Wuhan 430074,China)

机构地区：[1]中南民族大学化学与材料科学学院,湖北武汉430074

出　　处：《化学研究与应用》2023年第11期2607-2613,共7页Chemical Research and Application

基　　金：湖北省高等学校教学教研项目(项目编号:2021190)资助;中央高校基本科研业务费专项资金资助项目(项目编号:CXY22006和CZY23013)资助;民族院校应用化学专业虚拟教研室项目资助。

摘　　要：为寻求更高效、对可见光强响应的光催化材料,制定出一项嵌入型纳米空盒光反应器的合成新技术,先采用拓扑相变法和空氛烧结法合成空盒状TiO_(2)(TiO_(2)-HNBs),然后将贵金属M以肖特基结嵌入TiO_(2)-HNBs制备纳米反应器,再对持久性有机污染物(Persistent Organic Pollutant,POPs)(模型染料为罗丹明B)进行可见光降解测试。结果显示,这种嵌入型纳米空盒光反应器表现出非常优异的光催化性能。与P25相比,光降解效率提高4至5倍,尤其是嵌入Au纳米棒的纳米空盒光反应器(Au-NRs/TiO_(2)-HNBs,TR),150min对RhB的降解效率可达98.5%。这得益于TiO_(2)空盒形貌优化以及贵金属M的表面等离子体共振效应(Surface Plasmon Resonance,SPR),在可见光响应下,金属产生的热电子能量高,易克服肖特基势垒从金属纳米颗粒转移到TiO_(2)导带上,有效转移和分离光生电子-空穴对。同时光催化活性与金属粒子的形貌密切相关,TR嵌入型纳米空盒光反应器表现出最高的催化活性。In order to find a more efficient photocatalytic material with strong response to visible light,a new synthesis technology of embedded hollow nanoboxes photoreactor was developed.TiO,hollow nanoboxes(TiO_(2)-HNBs)was prepared by the topological phase change method and the air-atmosphere sintering method respectively,and then precious metal M was embedded in TiO,-HNBs to form a compact schottky junction.The degradation of persistent organic pollutants(POPs)(model dye is rhodamine B)was tested by visible light.The results show that the embedded hollow nanoboxes photoreactor has excellent photocatalytic performance.Compared with P25,the photodegradation efficiency is improved by four to five times,especially in Au-NRs/TiO,-HNBs(TR)with Au nano-rods embedded,and the degradation efficiency of RhB can reach 98.5%within 150 minutes.This is due to the optimization of Ti02 hollow nanoboxes and the surface plasmon resonance(SPR)effect of precious metal M.Under the response of visible light,the hot e-lectron energy generated by metal is high,and it is easy to overcome the Schottky barrier and transfer from metal nanoparticles to the conduction band of TiO_(2),effectively transferring and separating photo-generated electron-hole pairs.At the same time,the photocata-lytic activity is closely related to the morphology of metal particles,and the TR embedded hollow nanoboxes photoreactor shows the highest catalytic activity.

关 键 词：SPR效应 嵌入型纳米空盒光反应器 肖特基结 可见光降解 新技术 

分 类 号：O614.4[理学—无机化学]