Rapid organic degradation and bacteria destruction under visible light by ternary photocatalysts of Ag/AgX/TiO2
Rapid organic degradation and bacteria destruction under visible light by ternary photocatalysts of Ag/AgX/TiO2
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Ag/AgX/TiO2 三元光催化剂在可见光下快速降解有机物并杀灭细菌
DOI：
10.1016/j.jece.2017.10.045
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发表时间：
2017-12
影响因子：
7.7
通讯作者：
Sanping Chen
中科院分区：
文献类型：
--
作者：
Yanmin Geng;Gejuan Lei;Yuan Liao;Hai-Ying Jiang;Gang Xie;Sanping Chen
以葡萄糖和聚乙烯吡咯烷酮（PVP）为添加剂制备三维多孔气凝胶为牺牲模板，采用水热法一步合成了一系列Ag/AgX/TiO 2（X = Cl，Br，I）三元光催化剂。葡萄糖不仅可以作为三维多孔气凝胶的碳源，还可以将AgNO 3还原为Ag颗粒。同时，PVP促进了AgX和TiO 2的良好相互作用，使其进入碳气凝胶中。采用X射线衍射（XRD）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）和紫外-可见漫反射光谱（UV-vis DRS）对三元光催化剂的结构和性能进行了表征。在可见光下，Ag/AgX/TiO 2光催化剂对罗丹明B（Rh B）的光催化降解活性明显高于纯TiO 2和商品TiO 2（P25），这是由于Ag和AgX的诱导光催化活性所致.当AgX与TiO 2的摩尔比为20%时，Ag/AgX/TiO 2光催化剂的光催化活性最高，而Ag/AgBr/TiO 2 -20%时，Ag/AgX/TiO 2光催化剂的光催化活性最高。结果，它也被用于细菌破坏，以评估其抗菌活性，并显示出优异的性能。该工作为以三维多孔气凝胶为牺牲模板制备Ag/AgX/TiO 2三元光催化剂开辟了一条新的途径，有望在可见光下高效稳定地去除有机污染物并抑制细菌生长.
A series of ternary Ag/AgX/TiO2(X = Cl, Br, I) photocatalysts were synthesized by a facile, one-step hydrothermal method with a sacrificial template of three-dimensional porous aerogel, which produced by the additive glucose and polyvinylpyrrolidone (PVP). Here, glucose not only acts as a carbon source of 3D-porous aerogel, but also can reduce AgNO3to Ag particles. Meanwhile, PVP promotes the favorable interaction of AgX and TiO2into the carbon aerogel. The structures and properties of the ternary photocatalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and UV–vis diffuse reflectance spectroscopy (UV-vis DRS). Under visible light, the as-prepared ternary Ag/AgX/TiO2photocatalysts exhibited significantly enhanced photocatalytic activities for the degradation of rhodamine B (RhB) compared with bare TiO2and commercial TiO2(P25), which can be attributed to the inductive photoactivity of Ag and AgX. Notably, when the mole ratio of AgX to TiO2reached 20%, the corresponding samples show the best photocatalytic activities among Ag/AgX/TiO2photocatalysts, while Ag/AgBr/TiO2-20% sample shows the optimal performance among all the Ag/AgX/TiO2photocatalysts. As a result, it was also used for bacteria destruction to evaluate its antibacterial activity, and shows excellent performances. This work opens a new facile approach to prepare the ternary Ag/AgX/TiO2photocatalysts with 3D-porous aerogel as a sacrificial template, which are projected to efficiently and stably remove organic pollutants and inhibit the bacterial growth under visible light.
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DOI：
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发表时间：
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期刊：
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影响因子：
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影响因子：
15.1
作者：
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影响因子：
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作者：
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