Preparation of ZnNiAl-LDHs microspheres and their adsorption behavior and mechanism on U(VI)

Abstract Ternary zinc-nickel-aluminum hydrotalcites (ZnNiAl-LDHs) were prepared by hydrothermal synthesis. The structure and morphology of the materials were characterized using X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), nitrogen ads...

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Autores principales: Yanquan Ouyang, Yuanxin Xu, Limei Zhao, Mingzhan Deng, Pengfei Yang, Guowen Peng, Guojun Ke
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Publicado: Nature Portfolio 2021
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spelling oai:doaj.org-article:7ef8926fc8c64054a798010fa6337d9a2021-11-08T10:48:31ZPreparation of ZnNiAl-LDHs microspheres and their adsorption behavior and mechanism on U(VI)10.1038/s41598-021-01133-52045-2322https://doaj.org/article/7ef8926fc8c64054a798010fa6337d9a2021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-01133-5https://doaj.org/toc/2045-2322Abstract Ternary zinc-nickel-aluminum hydrotalcites (ZnNiAl-LDHs) were prepared by hydrothermal synthesis. The structure and morphology of the materials were characterized using X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), nitrogen adsorption–desorption (BET) and other test techniques. ZnNiAl-LDHs was applied in the treatment of uranium-containing wastewater, the effects of initial pH of the solution, adsorption temperature and contact time on its adsorption performance were systematically investigated, and the adsorption performance of ZnNiAl-LDHs and ZnAl-LDHs on uranyl ions were compared. The result showed that ZnNiAl-LDHs were 3D microspheres self-assembled from flakes, with a specific surface area of 102.02 m2/g, which was much larger than that of flake ZnAl-LDHs (18.49 m2/g), and the saturation adsorption capacity of ZnNiAl-LDHs for uranyl ions (278.26 mg/g) was much higher than that of ZnAl-LDHs for uranyl ions (189.16 mg/g), so the ternary ZnNiAl-LDHs had a more excellent adsorption capacity. In addition, kinetic and thermodynamic studies showed that the adsorption process of ZnNiAl-LDHs on uranyl ions conformed to the pseudo-second-order kinetic model and Langmuir isotherm model. The positive value of ΔH and the negative value of ΔG indicated that the adsorption process was endothermic and spontaneous. The adsorption mechanism was analyzed by X-ray energy spectroscopy (EDS), fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The results showed that the adsorption of uranyl ions by ZnNiAl-LDHs mainly consisted of complexation and ion substitution. The research results prove that ZnNiAl-LDHs is an adsorbent with low cost and excellent performance, and it has a good application prospect in the field of uranium-containing wastewater treatment.Yanquan OuyangYuanxin XuLimei ZhaoMingzhan DengPengfei YangGuowen PengGuojun KeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Yanquan Ouyang
Yuanxin Xu
Limei Zhao
Mingzhan Deng
Pengfei Yang
Guowen Peng
Guojun Ke
Preparation of ZnNiAl-LDHs microspheres and their adsorption behavior and mechanism on U(VI)
description Abstract Ternary zinc-nickel-aluminum hydrotalcites (ZnNiAl-LDHs) were prepared by hydrothermal synthesis. The structure and morphology of the materials were characterized using X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), nitrogen adsorption–desorption (BET) and other test techniques. ZnNiAl-LDHs was applied in the treatment of uranium-containing wastewater, the effects of initial pH of the solution, adsorption temperature and contact time on its adsorption performance were systematically investigated, and the adsorption performance of ZnNiAl-LDHs and ZnAl-LDHs on uranyl ions were compared. The result showed that ZnNiAl-LDHs were 3D microspheres self-assembled from flakes, with a specific surface area of 102.02 m2/g, which was much larger than that of flake ZnAl-LDHs (18.49 m2/g), and the saturation adsorption capacity of ZnNiAl-LDHs for uranyl ions (278.26 mg/g) was much higher than that of ZnAl-LDHs for uranyl ions (189.16 mg/g), so the ternary ZnNiAl-LDHs had a more excellent adsorption capacity. In addition, kinetic and thermodynamic studies showed that the adsorption process of ZnNiAl-LDHs on uranyl ions conformed to the pseudo-second-order kinetic model and Langmuir isotherm model. The positive value of ΔH and the negative value of ΔG indicated that the adsorption process was endothermic and spontaneous. The adsorption mechanism was analyzed by X-ray energy spectroscopy (EDS), fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The results showed that the adsorption of uranyl ions by ZnNiAl-LDHs mainly consisted of complexation and ion substitution. The research results prove that ZnNiAl-LDHs is an adsorbent with low cost and excellent performance, and it has a good application prospect in the field of uranium-containing wastewater treatment.
format article
author Yanquan Ouyang
Yuanxin Xu
Limei Zhao
Mingzhan Deng
Pengfei Yang
Guowen Peng
Guojun Ke
author_facet Yanquan Ouyang
Yuanxin Xu
Limei Zhao
Mingzhan Deng
Pengfei Yang
Guowen Peng
Guojun Ke
author_sort Yanquan Ouyang
title Preparation of ZnNiAl-LDHs microspheres and their adsorption behavior and mechanism on U(VI)
title_short Preparation of ZnNiAl-LDHs microspheres and their adsorption behavior and mechanism on U(VI)
title_full Preparation of ZnNiAl-LDHs microspheres and their adsorption behavior and mechanism on U(VI)
title_fullStr Preparation of ZnNiAl-LDHs microspheres and their adsorption behavior and mechanism on U(VI)
title_full_unstemmed Preparation of ZnNiAl-LDHs microspheres and their adsorption behavior and mechanism on U(VI)
title_sort preparation of znnial-ldhs microspheres and their adsorption behavior and mechanism on u(vi)
publisher Nature Portfolio
publishDate 2021
url https://doaj.org/article/7ef8926fc8c64054a798010fa6337d9a
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AT limeizhao preparationofznnialldhsmicrospheresandtheiradsorptionbehaviorandmechanismonuvi
AT mingzhandeng preparationofznnialldhsmicrospheresandtheiradsorptionbehaviorandmechanismonuvi
AT pengfeiyang preparationofznnialldhsmicrospheresandtheiradsorptionbehaviorandmechanismonuvi
AT guowenpeng preparationofznnialldhsmicrospheresandtheiradsorptionbehaviorandmechanismonuvi
AT guojunke preparationofznnialldhsmicrospheresandtheiradsorptionbehaviorandmechanismonuvi
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