Di Lijing, Xian Tao, Sun Xiaofeng, Li Hongqin, Zhou Yongjie, Ma Jun, Yang Hua
College of Physics and Electronic Information Engineering, Qinghai Normal University, Xining 810008, China.
State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China.
Micromachines (Basel). 2019 Jul 30;10(8):503. doi: 10.3390/mi10080503.
In this work, a series of carbon nanotubes (CNT)/AgS hybrid nanocomposites were successfully prepared by a facile precipitation method. Transmission electron microscope (TEM) observation indicates that AgS nanoparticles with an average particle size of ~25 nm are uniformly anchored on the surface of CNT. The photocatalytic activities of the CNT/AgS nanocomposites were investigated toward the degradation of rhodamine B (RhB) under visible and near-infrared (NIR) light irradiation. It is shown that the nanocomposites exhibit obviously enhanced visible and NIR light photocatalytic activities compared with bare AgS nanoparticles. Moreover, the recycling photocatalytic experiment demonstrates that the CNT/AgS nanocomposites possess excellent photocatalytic stability. The photoelectrochemical and photoluminescence measurements reveal the efficient separation of photogenerated charges in the CNT/AgS nanocomposites. This is the dominant reason behind the improvement of the photocatalytic activity. Based on active species trapping experiments, the possible photocatalytic mechanism of CNT/AgS nanocomposites for dye degradation under visible and NIR light irradiation was proposed.
在本工作中，通过一种简便的沉淀法成功制备了一系列碳纳米管（CNT）/AgS杂化纳米复合材料。透射电子显微镜（TEM）观察表明，平均粒径约为25 nm的AgS纳米颗粒均匀地锚定在CNT表面。研究了CNT/AgS纳米复合材料在可见光和近红外（NIR）光照射下对罗丹明B（RhB）降解的光催化活性。结果表明，与裸AgS纳米颗粒相比，该纳米复合材料表现出明显增强的可见光和近红外光光催化活性。此外，循环光催化实验表明，CNT/AgS纳米复合材料具有优异的光催化稳定性。光电化学和光致发光测量揭示了CNT/AgS纳米复合材料中光生电荷的有效分离。这是光催化活性提高的主要原因。基于活性物种捕获实验，提出了CNT/AgS纳米复合材料在可见光和近红外光照射下用于染料降解的可能光催化机理。
