期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 856, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.158217
关键词
Holmium; Rietveld; Photocatalytic; Density of states; Hybridization
资金
- Committee of Advanced Studies and Research (CASR)
- Department of Materials and Metallurgical Engineering (MME), Bangladesh University of Engineering and Technology (BUET)
Nanocrystalline ZnO nanoparticles were synthesized through a modified sol-gel method, and the enhanced photocatalytic activity of Zn1-xHoxO (x = 0.01, 0.03, and 0.05) NPs was investigated. The structural properties and morphological evolution were characterized using X-ray diffraction and field emission scanning electron microscope. The doping led to a red shift in the optical band gap and decreased electron-hole recombination rate, resulting in improved photocatalytic performance.
All nanocrystalline ZnO nanoparticles (NPs) were synthesized via modified sol-gel method and origin of the enhanced photocatalytic activity of the Zn1-xHoxO (x = 0.01, 0.03 and 0.05) NPs were investigated. Structural properties and morphological evolution were characterized using X-ray diffraction (XRD) and field emission scanning electron microscope (FE-SEM), respectively. Ultraviolet visible (UV-Vis) spectroscopy showed red shift of optical band gap on doping with minimum band gap of 3.10 eV for Zn0.97Ho0.03O. Photoluminescence (PL) spectroscopy showed decrease in electron-hole recombination rate with increasing doping up to 3 mol% doping. Photocatalytic activity was measured from degradation of rhodamine B (RhB) and reaction kinetics were analyzed. Theoretical study showed good agreement with experimental band gap results. Decreased electron-hole recombination rate with doping due to electron trapping by partially filled 4f orbitals of Ho3+ ions, change in NPs morphology and the red shift of the optical band gap resulted the best photocatalytic performance of Zn0.97Ho0.03O NPs. (C) 2020 Elsevier B.V. All rights reserved.
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