Rare earth co-doped ZnO photocatalysts: Solution combustion synthesis and environmental applications

doi:10.1016/j.seppur.2019.116328

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	Rare earth co-doped ZnO photocatalysts: Solution combustion synthesis and environmental applications
	Ahmad, I.1; Shoaib Akhtar, Muahmmad 2; Ahmed, Ejaz 1; Ahmad, Mukhtar 1; Keller, Valérie 3; Qamar Khan, Waheed 4; Khalid, N.R.5
刊名	Separation and Purification Technology
	2020-04-15
卷号	237
关键词	Carrier mobility Catalysts Combustion synthesis Crystallite size Energy gap II-VI semiconductors Ions Light Morphology Nanoparticles Oxide minerals Photocatalysts Photocatalytic activity Photocurrents Rare earths Terbium Uranium metallography Vanadium metallography X ray diffraction X ray photoelectron spectroscopy Zinc oxide Zinc sulfide ZnO nanoparticles Environmental applications H2 generation Hexagonal wurtzite structure High photocatalytic activities Photocatalytic hydrogen evolution Physical and chemical properties Solution combustion synthesis Visible light activated photocatalysts
ISSN号	13835866
DOI	10.1016/j.seppur.2019.116328
英文摘要	A novel europium (Eu) and terbium (Tb) co-doped ZnO nanoparticles had been synthesized by a facile, cost efficient and rapid combustion method. The physical and chemical properties of the as-synthesized nanoparticles were determined by XRD, SEM, EDS, BET, FTIR, XPS, UV–vis DRS, PL, EIS and photocurrent density. XRD patterns confirm that Eu and Tb ions are stably inserted into the framework of ZnO, and the crystallite size decreases to 21 nm compared to that of pure ZnO (32 nm) as the amount of co-dopants increases to optimal value (3 mol% of each). With the insertion of Eu and Tb ions into ZnO, the recombination rate of photo generated charge carriers is found to be low. It is observed that doped Eu and Tb ions can enter the lattice structure of ZnO with a suitable doping concentration, and the obtained doped ZnO have ordered hexagonal wurtzite structures and nearly spherical morphology with high specific surface area and high porosity. Meanwhile, the introduction of Eu and Tb ions can effectively extend the spectral response from UV to visible region for the catalysts, thus reducing the band gap from 3.25 to 2.91 eV. Further analysis by means of XPS measurement showed that the existence of mixture of Eu2+/Eu3+ and Tb3+/Tb4+ oxidation states and high content of the surface chemisorbed oxygen species also contributed to the high photocatalytic activity. It was found that Eu and Tb co-doped ZnO shows highly efficient and stable visible light activity and provides a 100% MB degradation within 15 min, while the degradation time for Eu doped ZnO and Tb doped ZnO is reduced gradually to 50 and 42 min, respectively to obtain the 100% MB degradation. It was also found that the photocatalytic hydrogen evolution activity over Eu and Tb co-doped ZnO can be significantly increased to 533.8 and 792 µmol with 0.2 wt% catalyst dose and initial solution pH 9, respectively under similar conditions with good stability. Moreover, simultaneous introduction of Eu and Tb effectively promoted the yield of CH4 to 4.59 µmol, which was 3.4 fold higher in comparison to pure ZnO. Thus the present approach could provide a versatile strategy for the synthesis of novel and efficient visible light activated photocatalysts. © 2019 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:000509625700033
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/115528]
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; 3.Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES), CNRS UMR 7515, University of Strasbourg, 25 rue Becquerel, Strasbourg Cedex; 67087, France; 4.Institute of Advanced Materials, Bahauddin Zakariya University, Multan; 6800, Pakistan; 5.Department of Physics, University of Gujrat, Pakistan
推荐引用方式 GB/T 7714	Ahmad, I.,Shoaib Akhtar, Muahmmad,Ahmed, Ejaz,et al. Rare earth co-doped ZnO photocatalysts: Solution combustion synthesis and environmental applications[J]. Separation and Purification Technology,2020,237.
APA	Ahmad, I..,Shoaib Akhtar, Muahmmad.,Ahmed, Ejaz.,Ahmad, Mukhtar.,Keller, Valérie.,...&Khalid, N.R..(2020).Rare earth co-doped ZnO photocatalysts: Solution combustion synthesis and environmental applications.Separation and Purification Technology,237.
MLA	Ahmad, I.,et al."Rare earth co-doped ZnO photocatalysts: Solution combustion synthesis and environmental applications".Separation and Purification Technology 237(2020).