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.

引用

页数：13

共 89 条

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