Citation: Mengli Zhao, Wanni Wang, Chenxi Huang, Wang Dong, Yang Wang, Sheng Cheng, Huiqing Wang, Haisheng Qian. Facile synthesis of UCNPs/Zn_xCd_1-xS nanocomposites excited by near-infrared light for photochemical reduction and removal of Cr(VI)[J]. Chinese Journal of Catalysis, ;2018, 39(7): 1240-1248. doi: 10.1016/S1872-2067(18)63061-X shu

Facile synthesis of UCNPs/Zn_xCd_1-xS nanocomposites excited by near-infrared light for photochemical reduction and removal of Cr(VI)

a School of Biological and Medical Engineering, Hefei University of Technology, Hefei 230009, Anhui, China;
b School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, Anhui, China;
c Instrumental Analysis Center, Hefei University of Technology, Hefei 230009, Anhui, China

Received Date: 7 January 2018
Revised Date: 21 March 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (21471043, 51603059, 31501576).

Photocatalysis driven by near-infrared (NIR) light is of scientific and technological interest for exploiting solar energy. In this study, we demonstrate a facile hydrothermal process to synthesize core-shell nanoparticles combining upconversion nanoparticles (UCNPs) and alloyed Zn_xCd_1-xS, which can be excited using NIR or visible light. Morphologies, phase, and chemical composition have been investigated using field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction analysis, and atomic absorption spectroscopy. Moreover, we found that amorphous TiO₂ layers existing in the final samples play an important role in formation of UCNPs@Zn_xCd_1-xS yolk-shell nanoparticles, which bind the as-prepared Zn_xCd_1-xS nanoparticles tightly to form yolk-shell nanoparticles. The chemical composition of alloyed Zn_xCd_1-xS can be tunable by adjusting the amount of the Cd and Zn source compounds. The photochemical reduction of Cr(VI) in water has been performed to study the photocatalytic performance under irradiation by NIR light or a simulated solar light, showing efficient photoreduction and Cr(VI) removal over the as-prepared UCNPs@Zn_xCd_1-xS/TiO₂ yolk-shell nanoparticles. The as-prepared UCNPs@Zn_xCd_1-xS/ TiO₂ nanoparticles show excellent production of hydroxyl radicals, which are responsible for the photochemical reduction of Cr(VI) to Cr(Ⅲ). This study will provide an alternative strategy for environmental wastewater treatment, making full use of solar energy.
- Upconversion nanoparticle,
- Zn_xCd_1-xS alloyed semiconductor,
- Yolk-shell,
- Photocatalysis,
- Hydrothermal synthesis
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通讯作者: 陈斌, bchen63@163.com

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Facile synthesis of UCNPs/ZnxCd1-xS nanocomposites excited by near-infrared light for photochemical reduction and removal of Cr(VI)

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通讯作者: 陈斌, bchen63@163.com

Facile synthesis of UCNPs/Zn_xCd_1-xS nanocomposites excited by near-infrared light for photochemical reduction and removal of Cr(VI)