Fabrication of Ag-Ag2O/reduced TiO2 nanophotocatalyst and its enhanced visible light driven photocatalytic performance for degradation of diclofenac solution
Fabrication of Ag-Ag2O/reduced TiO2 nanophotocatalyst and its enhanced visible light driven photocatalytic performance for degradation of diclofenac solution
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Ag-Ag2O/还原TiO2纳米光催化剂的制备及其增强的可见光驱动光催化降解双氯芬酸溶液的性能
DOI：
10.1016/j.apcatb.2017.01.014
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发表时间：
2017-06-05
影响因子：
22.1
通讯作者：
Liu, Huiling
中科院分区：
文献类型：
--
作者：
Cui, Yuqi;Ma, Qiuling;Liu, Huiling
本研究以硼氢化钾为还原剂，采用一步溶液还原法制备了Ag-Ag 2 O/还原型TiO 2（简称Ag-Ag 2 O/r-TiO 2）纳米光催化剂。采用扫描电镜（SEM）、N-2吸附/脱附等温线、X射线衍射（XRD）、X射线光电子能谱（XPS）、紫外-可见漫反射光谱（UV-vis DRS）、电子自旋共振（ESR）和时间分辨表面光电压（TR-SPV）等技术对样品的物理化学性质进行了研究。结果表明，硼氢化钾处理可以同时诱导TiO 2禁带与Ag和Ag 2 O纳米晶形式的金属Ag物种之间产生Ti 3+自掺杂能级，从而大大增强可见光吸收和光致电荷分离效率。此外，通过双氯芬酸的降解和.OH自由基的产生来评价可见光驱动（VLD）光催化（PC）性能。Ag-Ag_2 O/r-TiO_2样品表现出更高的VLD PC性能和更大的.OH自由基生成量。提出并证实了增强VLD PC的机理，这主要归因于Ag-0纳米晶和Ti 3+自掺杂的局域SPR协同效应，该协同效应导致了强烈的可见光吸收、高的光诱导电荷分离效率和VLD PC性能。(C)2017爱思唯尔B. V.保留所有权利。
In this study, Ag-Ag2O/reduced TiO2 (denoted as Ag-Ag2O/r-TiO2) nano-photocatalyst had been fabricated through one-step solution reduction strategy in the presence of potassium borohydride. Afterwards, physicochemical properties of the resulting samples were investigated by scanning electron microscope (SEM), N-2 adsorption/desorption isotherms, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), electron spin resonance (ESR) and time resolved surface photovoltage (TR-SPV) techniques. Results indicated that potassium borohydride treatment could simutaneously induce the generation of Ti3+ self-doping energy level between the forbidden band of TiO2 and metallic Ag species existed in the forms of Ag and Ag2O nanocrystalline, thereby resulting in the greatly enhanced visible light absorbance and photoinduced charge separation efficiency. In addition, the visible light driven (VLD) photocatalytic (PC) performance was evaluated through the degradation of diclofenac and generation of.OH radicals. As -expected, Ag-Ag2O/r-TiO2 sample exhibited higher VLD PC performance and larger generation amount of.OH radicals. Furthermore, the enhanced VLD PC mechanism was proposed and confirmed, which was mainly attributed to the synergistic effect originated from the localized SPR of Ag-0 nanocrystalline and Ti3+ self-doping which responsible for the intense visible light absorbance, high photoinduced charge separation efficiency and VLD PC performance. (C) 2017 Elsevier B.V. All rights reserved.