Enhanced photocatalytic activity of Ho3+ doped ZnO NPs synthesized by modified sol-gel method: An experimental and theoretical investigation

被引：49
作者：
Ayon, Sikder Ashikuzzaman [1 ]
Billah, Md Muktadir [1 ]
Nishat, Sadiq Shahriyar [2 ]
Kabir, Alamgir [2 ]
机构：
[1] Bangladesh Univ Engn & Technol, Dept Mat & Met Engn, Dhaka 1000, Bangladesh
[2] Univ Dhaka, Dept Phys, Dhaka 1000, Bangladesh
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2021年 / 856卷
关键词：
Holmium; Rietveld; Photocatalytic; Density of states; Hybridization; ZINC-OXIDE; BAND-GAP; HIERARCHICAL MICRO/NANOSPHERES; SONOCATALYTIC DEGRADATION; ORGANIC CONTAMINANTS; MAGNETIC-PROPERTIES; AQUEOUS SUSPENSION; OPTICAL-PROPERTIES; NANOPARTICLES; NANORODS;
D O I：
10.1016/j.jallcom.2020.158217
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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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页数：13
相关论文
共 89 条
[21]   THE EFFECT OF DIFFERENT ZNO PRECURSORS ON THE CATALYTIC DECOMPOSITION OF ETHANOL [J].
HALAWY, SA ;
MOHAMED, MA .
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 1995, 98 (02) :L63-L68
[22]   Public perception and participation in water reuse [J].
Hartley, TW .
DESALINATION, 2006, 187 (1-3) :115-126
[23]   A screening level fate model of organic contaminants from advanced water treatment in a potable water supply reservoir [J].
Hawker, Darryl W. ;
Cumming, Janet L. ;
Neale, Peta A. ;
Bartkow, Michael E. ;
Escher, Beate I. .
WATER RESEARCH, 2011, 45 (02) :768-780
[24]   Nano ZnO synthesis by modified sol gel method and its application in heterogeneous photocatalytic removal of phenol from water [J].
Hayat, Khizar ;
Gondal, M. A. ;
Khaled, Mazen M. ;
Ahmed, Shakeel ;
Shemsi, Ahsan M. .
APPLIED CATALYSIS A-GENERAL, 2011, 393 (1-2) :122-129
[25]   Recent advances in semiconductors for photocatalytic and photoelectrochemical water splitting [J].
Hisatomi, Takashi ;
Kubota, Jun ;
Domen, Kazunari .
CHEMICAL SOCIETY REVIEWS, 2014, 43 (22) :7520-7535
[26]  
Hossain M.M., 2012, ECOL WATER QUAL WATE, V24, P456
[27]   Cobalt spin states and hyperfine interactions in LaCoO3 investigated by LDA+U calculations [J].
Hsu, Han ;
Blaha, Peter ;
Wentzcovitch, Renata M. ;
Leighton, C. .
PHYSICAL REVIEW B, 2010, 82 (10)
[28]  
Huang MH, 2001, ADV MATER, V13, P113, DOI 10.1002/1521-4095(200101)13:2<113::AID-ADMA113>3.0.CO
[29]  
2-H
[30]   Fundamentals of zinc oxide as a semiconductor [J].
Janotti, Anderson ;
Van de Walle, Chris G. .
REPORTS ON PROGRESS IN PHYSICS, 2009, 72 (12)
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