Highly efficient visible light driven photocatalytic activity of graphene and CNTs based Mg doped ZnO photocatalysts: A comparative study

doi:10.1016/j.seppur.2020.116892

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	Highly efficient visible light driven photocatalytic activity of graphene and CNTs based Mg doped ZnO photocatalysts: A comparative study
	Ahmad, Irshad 1; Akhtar, Muhammad Shoaib 2; Ahmed, Ejaz 1; Ahmad, Mukhtar 1
刊名	Separation and Purification Technology
	2020-08-15
卷号	245
关键词	Aromatic compounds Carrier mobility Heterojunctions II-VI semiconductors Image enhancement Light Light absorption Magnesium Magnesium metallography Nanocatalysts Oxide minerals Reusability Sol-gel process Sol-gels Transient analysis X ray diffraction Zinc oxide ZnO nanoparticles Comparative studies Efficient strategy Electron hole recombination rate Photocatalytic performance Photocatalytic systems Photocurrent transients Visible light driven photocatalysts Visible-light-driven
ISSN号	13835866
DOI	10.1016/j.seppur.2020.116892
英文摘要	Novel photocatalysts, Mg doped ZnO/CNTs (MZC) and Mg doped ZnO/graphene (MZG) composites synthesized via sol-gel method and characterized with a variety of tools such as XRD, SEM, TEM, BET surface area, EDX, UV-vis DRS, PL, photocurrent transient response, EIS and Mott-Schottky studies were used to study the photocatalytic methylene blue (MB) elimination under visible light illumination. When compared with pure ZnO nanoparticles, MZG catalyst showed considerably about 5.23 times higher photocatalytic activity in the elimination of MB, while about two times higher than MZC catalyst under 60 min visible light illumination. Similarly, the catalyst dose of 1 g/L resulted in great improvement of photocatalytic MB elimination over MZG catalyst under visible light illumination, reaching to MB elimination rate of 100% in just 30 min which is the highest among all ZnO based photocatalytic systems reported so far. Also, this elimination rate was six times higher than that of pure ZnO catalyst, while approximately 1.3 times greater than that of MZC photocatalyst. As initial solution pH treatment, the photocatalytic activity was gradually increased under visible light illumination up to optimal pH 10, identifying 4.5 and 1.4 times higher elimination rate for MZG catalyst than pure ZnO and MZC catalysts, respectively. Designing heterojunction, declining grain size extending optical absorption, improving surface area, inhibiting electron-hole recombination rate and quick transport of photo generated charge carriers to the surface of the photocatalyst due to its lower impedance were considered efficient strategies to enhance the photocatalytic performances. The MZG photocatalyst revealed efficient photocatalytic stability under visible light illumination retaining efficiency about 100% after five cycles of MB elimination. Similarly, XRD and PL reusability tests of MZG photocatalyst did not reveal any difference in its structural and emission responses. The efficient and inexpensive photocatalytic results and strong stability of MZG photocatalyst exemplarily highlights new pathways to design potential visible light driven photocatalysts for industrial applications. © 2020 Elsevier B.V.
WOS研究方向	Engineering
语种	英语
出版者	Elsevier B.V., Netherlands
WOS记录号	WOS:000531080600016
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/115475]
专题	兰州理工大学
作者单位	1.Department of Physics, Bahauddin Zakariya University, Multan; 60800, Pakistan; 2.School of Computer and Communication, Lanzhou University of Technology, Lanzhou; 10731, China
推荐引用方式 GB/T 7714	Ahmad, Irshad,Akhtar, Muhammad Shoaib,Ahmed, Ejaz,et al. Highly efficient visible light driven photocatalytic activity of graphene and CNTs based Mg doped ZnO photocatalysts: A comparative study[J]. Separation and Purification Technology,2020,245.
APA	Ahmad, Irshad,Akhtar, Muhammad Shoaib,Ahmed, Ejaz,&Ahmad, Mukhtar.(2020).Highly efficient visible light driven photocatalytic activity of graphene and CNTs based Mg doped ZnO photocatalysts: A comparative study.Separation and Purification Technology,245.
MLA	Ahmad, Irshad,et al."Highly efficient visible light driven photocatalytic activity of graphene and CNTs based Mg doped ZnO photocatalysts: A comparative study".Separation and Purification Technology 245(2020).