Visible-light photocatalytic oxidation of CO over plasmonic Au/TiO2: Unusual features of oxygen plasma activation
Visible-light photocatalytic oxidation of CO over plasmonic Au/TiO2: Unusual features of oxygen plasma activation
复制标题
等离子体 Au/TiO2 上 CO 的可见光光催化氧化：氧等离子体激活的不寻常特征
DOI：
10.1016/j.apcatb.2016.01.055
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发表时间：
2016-07-05
影响因子：
22.1
通讯作者：
Zhu, Ai-Min
中科院分区：
文献类型：
--
作者：
Deng, Xiao-Qing;Zhu, Bin;Zhu, Ai-Min
为了寻求等离子体Au/TiO2光催化剂的高效活化方法，采用常压冷等离子体氧气(OP)和Ar(ArP)对玻璃基片上的Au/TiO2光催化剂进行活化，并与传统的焙烧方法进行了比较。在可见光(波长420 nm)下的连续流光催化氧化(PCO)反应器中对活化样品进行了表征，并用透射电子显微镜(TEM)、X射线光电子能谱(XPS)、紫外可见光谱(UV-Vis)、CO化学吸附和电子顺磁共振(EPR)对其进行了表征。尽管三种活化样品的Au纳米颗粒(NPs)的平均粒径在4 nm左右，但OP和ARP样品分别表现出最高和最低的PCO活性。氧等离子体活化的一个不同寻常的特征是表面氧含量高，它通过金纳米粒子的局部表面等离子体共振(LSPR)接受可见光吸收产生的热电子，从而有利于超氧化物(O-2(-))的形成。OP样品具有最低的金属Au含量，但其阳离子Au在诱导期可迅速还原，在Au纳米颗粒与Ti02载体的界面附近形成大量低配位的金属Au，这是氧等离子体激活的另一个不寻常的特征。(C)2016爱思唯尔B.V.保留所有权利。
To seek an efficient activation of plasmonic Au/TiO2 photocatalysts, atmospheric-pressure cold plasmas of oxygen (OP) and argon (ArP) were employed to activate the Au/TiO2 coating samples on glass substrate and compared with the conventionally calcination. The activated samples were evaluated in a continuous flow photocatalytic oxidation (PCO) reactor under visible light (lambda > 420 nm) for CO removal from synthetic air and characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-vis spectroscopy, CO chemisorption and electron paramagnetic resonance (EPR). Although Au nanoparticles (NPs) of the three activation samples averaged at around 4 nm by TEM, the OP and ArP samples exhibited the highest and lowest PCO activity, respectively. An unusual feature of oxygen plasma activation is high content of surface oxygen, which favors superoxide (O-2(-)) formation by accepting hot electron generated from absorption of visible light through local surface plasmon resonance (LSPR) of Au NPs. The OP sample has the lowest metallic Au content but its cationic Au can be rapidly reduced to form numerous low-coordinated metallic Au around the interface between Au NPs and TiO2 support in the induction period, which is another unusual feature of oxygen plasma activation. (C) 2016 Elsevier B.V. All rights reserved.