Highly efficient visible-light photocatalytic performance of Ag/AgIn5S8 for degradation of tetracycline hydrochloride and treatment of real pharmaceutical industry wastewater
Highly efficient visible-light photocatalytic performance of Ag/AgIn5S8 for degradation of tetracycline hydrochloride and treatment of real pharmaceutical industry wastewater
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DOI：
10.1016/j.cej.2017.09.022
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发表时间：
2018-02-01
影响因子：
15.1
通讯作者：
Dionysiou, Dionysios D.
中科院分区：
文献类型：
--
作者：
Deng, Fang;Zhao, Lina;Dionysiou, Dionysios D.
在半导体上沉积银纳米颗粒（NPs）是一种有效的提高光生电子和空穴分离的途径，但现有的Ag基光催化剂的光催化效率仍然较低，离实际应用还很远。本研究以AgIn 5S 8为载体，通过溶剂热法和光还原法制备了一种新型光催化剂Ag/AgIn 5S 8（Ag/AgIn 5S 8）。Ag纳米粒子的沉积量对Ag/AgIn 5S 8的电荷分离和可见光催化活性有明显的影响，2.5%Ag/AgIn 5S 8纳米复合材料的可见光催化活性最高，对盐酸四环素（TC% HCl）的降解率为95.3%。AgIn_5S_8的适当带隙以及它们之间的协同效应。TC% HCl降解的主要反应物种是中心点OH和中心点O-2（-）。根据高效液相色谱-串联质谱（HPLC-MS）分析、主要反应物种以及AgIn 5S 8的导带和价带，提出了TC% HCl降解的可能途径和Ag/AgIn 5S 8的光催化机理。将Ag/AgIn 5S 8纳米复合材料应用于真实的制药废水的处理，发现对真实的制药废水的矿化效率和COD去除率分别可达56.3%和77.6%。以上结果表明Ag/AgIn 5S 8光催化剂在处理真实的制药废水方面具有良好的前景。
The deposition of Ag nanoparticles (NPs) on semiconductors has been demonstrated to be an efficient route to improve the separation of photogenerated electrons and holes due to plasma resonance effect, but the photocatalytic efficiency of the available Ag-based photocatalysts is still low and far from practical application. In this study, a novel photocatalyst with Ag NPs deposited on the surface of AgIn5S8 (Ag/AgIn5S8) was fabricated via solvothermal method and further photo-reduction approach. The amount of deposited Ag nanoparticles has an obvious effect on the charge separation and visible-light photocatalytic activity of Ag/AgIn5S8, and 2.5% Ag/AgIn5S8 nanocomposites exhibit the highest visible-light photocatalytic activity with 95.3% degradation efficiency of tetracycline hydrochloride (TC% HCl) compared with that of the other samples due to the surface plasmon resonance of Ag NPs, proper bandgap of AgIn5S8 and the synergistic effect between them. The main reactive species in TC% HCl degradation are center dot OH and center dot O-2(-). The possible degradation pathway of TC% HCl and photocatalytic mechanism of Ag/AgIn5S8 were proposed according to high performance liquid chromatographytandem mass spectrometry (HPLC-MS) analysis, main reactive species, and conduction band and valence band of AgIn5S8. Moreover, Ag/AgIn5S8 nanohybrids were applied to treat real pharmaceutical industry wastewater, and it was found that the mineralization efficiency and COD removal of real pharmaceutical industry wastewater can reach 56.3% and 77.6%, respectively. The above results indicate Ag/AgIn5S8 photocatalysts have a promising prospect in the treatment of real pharmaceutical industry wastewater.