Organic Pollutant Photodecomposition by Ag/KNbO3 Nanocomposites: A Combined Experimental and Theoretical Study
Organic Pollutant Photodecomposition by Ag/KNbO3 Nanocomposites: A Combined Experimental and Theoretical Study
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DOI：
10.1021/acs.jpcc.5b11297
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发表时间：
2016-01
影响因子：
3.7
通讯作者：
Tingting Zhang;Wanying Lei;Ping Liu;J. Rodríguez;Jiaguo Yu;Y. Qi;Gang Liu;Minghua Liu
中科院分区：
文献类型：
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作者：
Tingting Zhang;Wanying Lei;Ping Liu;J. Rodríguez;Jiaguo Yu;Y. Qi;Gang Liu;Minghua Liu
通过简单的光还原法制备了负载在钙钛矿正交KNbO3纳米线上的银纳米粒子，并用XRD、Raman、DRUV-vis、XPS、PL、TEM、HRTEM和HAADF-STEM对其进行了系统表征。Ag/KNbO3纳米复合材料在紫外光和可见光下降解罗丹明B的光反应性随Ag含量（0.4-2.8 wt %）的变化而变化。随着银含量的增加，紫外光诱导的光反应性先升高后降低。在最佳银含量（约1.7 wt %）下，紫外光下达到最大的光催化活性，光催化反应速率为1.7 wt % Ag/KNbO3，比原始KNbO3高出约13倍。在0.4 ~ 2.8 wt %范围内，随着Ag含量的增加，可见光诱导的光反应性单调增加。根据光催化过程中检测到的活性物质和中间产物，结合共轭结构裂解和n -去乙基化进行了分析。
Ag nanoparticles supported on well-defined perovskite orthorhombic KNbO3 nanowires are synthesized via facile photoreduction and systematically characterized by XRD, Raman, DRUV–vis, XPS, PL, TEM, HRTEM, and HAADF-STEM. The photoreactivity of Ag/KNbO3 nanocomposites as a function of Ag contents (0.4–2.8 wt %) is assessed toward aqueous rhodamine B degradation under UV- and visible-light, respectively. It is found that the UV-induced photoreactivity initially increases and then decreases with increasing Ag contents. At an optimal Ag content (ca. 1.7 wt %), the greatest photoreactivity is achieved under UV light, with the photocatalytic reaction rate of 1.7 wt % Ag/KNbO3 exceeding that of pristine KNbO3 by a factor of ca. 13. In contrast, visible light-induced photoreactivity monotonically increases with increasing Ag contents in the range of 0.4–2.8 wt %. On the basis of the detected active species and intermediate products in the photocatalytic processes, conjugated structure cleavage and N-deethylation a...