Preparation and photocatalytic properties of visible light driven Ag–AgCl–TiO2/palygorskite composite
Preparation and photocatalytic properties of visible light driven Ag–AgCl–TiO2/palygorskite composite
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DOI：
10.1016/j.jallcom.2015.10.078
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发表时间：
2016-02
影响因子：
6.2
通讯作者：
Yanqing Yang;Ruixiang Liu;Gaoke Zhang;Lizhen Gao;Weike Zhang
中科院分区：
文献类型：
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作者：
Yanqing Yang;Ruixiang Liu;Gaoke Zhang;Lizhen Gao;Weike Zhang
以Ag-AgCl-TiO 2/凹凸棒石为载体，采用一种简单的方法制备了可见光催化剂。采用X射线衍射（XRD）、拉曼光谱、氮吸附-脱附、紫外-可见漫反射光谱（UV-vis DRS）和X射线光电子能谱（XPS）对样品进行了表征。结果表明，Ag-AgCl-TiO 2/凹凸棒石复合材料中Ag纳米粒子的局域表面等离子体共振导致了可见光区的等离子体共振吸收带。以罗丹明B（RhB）和4-硝基苯酚（4-NP）为降解物，在可见光照射下考察了复合材料的光催化活性。结果表明，Ag-AgCl-TiO 2/凹凸棒石复合催化剂对RhB染料的吸附能力和光催化降解效率均高于商业P25 TiO 2、TiO 2/凹凸棒石、Ag-TiO 2/凹凸棒石、AgCl-TiO 2/凹凸棒石和Ag-AgCl复合催化剂。此外，还通过猝灭实验研究了参与降解反应的光活性自由基物种。
A visible light responsive photocatalyst consisting Ag–AgCl composite dispersed over TiO2/palygorskite (Ag–AgCl–TiO2/palygorskite) was synthesized via a facile method. The as-obtained samples were characterized by X-ray diffraction (XRD), Raman spectra, nitrogen adsorption-desorption measurements, UV–visible diffused reflectance spectra (UV–vis DRS) and X-ray photoelectron spectroscopy (XPS). The results confirmed that the localized surface plasmon resonance of Ag nanoparticles in the Ag–AgCl–TiO2/palygorskite composite resulted in a plasmon resonance absorption band in the visible region. The photocatalytic activity of the composite was evaluated by degradation of Rhodamine B (RhB) and 4-nitrophenol (4-NP) under visible light irradiation. The results indicate that Ag–AgCl–TiO2/palygorskite catalyst exhibited stronger adsorption capacity and higher photocatalytic degradation efficiency for RhB dye than the well-known commercial P25 TiO2photocatalyst, the TiO2/palygorskite, the Ag–TiO2/palygorskite, the AgCl–TiO2/palygorskite and the Ag–AgCl composite. In addition, the photoactive radical species involved in the degradation reaction also have been investigated by quenching experiments.