Efficient, selective, and reusable metal–organic framework-based adsorbent for the removal of Pb(II) and Cr(VI) heavy-metal pollutants from wastewater

Water containing excess heavy metals poses a health risk to humans but can be purified effectively using adsorbents. As such, identifying novel and efficient adsorbents to remove heavy metals such as Pb(II) and Cr(VI) is vital. We report a new metal-organic framework (MOF), {[Cd1.5(btc)(bibp)·2H2O]·...

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Autores principales:	Yanjin Zheng, Feng Rao, Meilli Zhang, Jing Li, Wenxuan Huang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Metal-organic frameworks Heavy-metal ion removal Adsorption Water purification Sorbent reusability Renewable energy sources TJ807-830 Environmental engineering TA170-171
Acceso en línea:	https://doaj.org/article/503f73affdcd4bebb427572d47e8faef
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spelling	oai:doaj.org-article:503f73affdcd4bebb427572d47e8faef2021-11-26T04:41:45ZEfficient, selective, and reusable metal–organic framework-based adsorbent for the removal of Pb(II) and Cr(VI) heavy-metal pollutants from wastewater2666-790810.1016/j.clet.2021.100344https://doaj.org/article/503f73affdcd4bebb427572d47e8faef2021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666790821003049https://doaj.org/toc/2666-7908Water containing excess heavy metals poses a health risk to humans but can be purified effectively using adsorbents. As such, identifying novel and efficient adsorbents to remove heavy metals such as Pb(II) and Cr(VI) is vital. We report a new metal-organic framework (MOF), {[Cd1.5(btc)(bibp)·2H2O]·H2O}n, capable of capturing Pb(II) and Cr(VI) from water. The adsorbent has a high density of exposed active sites, with maximum adsorption capacities of 537.634 mg/g for Pb(II) (pH = 7) and 787.402 mg/g for Cr(VI) (pH = 6). Adsorption equilibrium was reached after 60 and 120 min with Pb(II) and Cr(VI), respectively, and the adsorbent was regenerated effectively using an ethanol-acetic acid eluent. Analysis of the adsorption kinetics using Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy showed that the abundant –OH groups (hard base) and the Pb(II)/Cr(VI) (soft acid) behave according to the hard-soft acid-base principle. In addition, electron pairs are shared between the imidazole N atoms and Pb(II)/Cr(VI). This study provides new insights into the design of three-dimensional MOFs for removing pollutants from industrial wastewaters, with the potential to mitigate health risks to humans and natural ecosystems.Yanjin ZhengFeng RaoMeilli ZhangJing LiWenxuan HuangElsevierarticleMetal-organic frameworksHeavy-metal ion removalAdsorptionWater purificationSorbent reusabilityRenewable energy sourcesTJ807-830Environmental engineeringTA170-171ENCleaner Engineering and Technology, Vol 5, Iss , Pp 100344- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Metal-organic frameworks Heavy-metal ion removal Adsorption Water purification Sorbent reusability Renewable energy sources TJ807-830 Environmental engineering TA170-171
spellingShingle	Metal-organic frameworks Heavy-metal ion removal Adsorption Water purification Sorbent reusability Renewable energy sources TJ807-830 Environmental engineering TA170-171 Yanjin Zheng Feng Rao Meilli Zhang Jing Li Wenxuan Huang Efficient, selective, and reusable metal–organic framework-based adsorbent for the removal of Pb(II) and Cr(VI) heavy-metal pollutants from wastewater
description	Water containing excess heavy metals poses a health risk to humans but can be purified effectively using adsorbents. As such, identifying novel and efficient adsorbents to remove heavy metals such as Pb(II) and Cr(VI) is vital. We report a new metal-organic framework (MOF), {[Cd1.5(btc)(bibp)·2H2O]·H2O}n, capable of capturing Pb(II) and Cr(VI) from water. The adsorbent has a high density of exposed active sites, with maximum adsorption capacities of 537.634 mg/g for Pb(II) (pH = 7) and 787.402 mg/g for Cr(VI) (pH = 6). Adsorption equilibrium was reached after 60 and 120 min with Pb(II) and Cr(VI), respectively, and the adsorbent was regenerated effectively using an ethanol-acetic acid eluent. Analysis of the adsorption kinetics using Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy showed that the abundant –OH groups (hard base) and the Pb(II)/Cr(VI) (soft acid) behave according to the hard-soft acid-base principle. In addition, electron pairs are shared between the imidazole N atoms and Pb(II)/Cr(VI). This study provides new insights into the design of three-dimensional MOFs for removing pollutants from industrial wastewaters, with the potential to mitigate health risks to humans and natural ecosystems.
format	article
author	Yanjin Zheng Feng Rao Meilli Zhang Jing Li Wenxuan Huang
author_facet	Yanjin Zheng Feng Rao Meilli Zhang Jing Li Wenxuan Huang
author_sort	Yanjin Zheng
title	Efficient, selective, and reusable metal–organic framework-based adsorbent for the removal of Pb(II) and Cr(VI) heavy-metal pollutants from wastewater
title_short	Efficient, selective, and reusable metal–organic framework-based adsorbent for the removal of Pb(II) and Cr(VI) heavy-metal pollutants from wastewater
title_full	Efficient, selective, and reusable metal–organic framework-based adsorbent for the removal of Pb(II) and Cr(VI) heavy-metal pollutants from wastewater
title_fullStr	Efficient, selective, and reusable metal–organic framework-based adsorbent for the removal of Pb(II) and Cr(VI) heavy-metal pollutants from wastewater
title_full_unstemmed	Efficient, selective, and reusable metal–organic framework-based adsorbent for the removal of Pb(II) and Cr(VI) heavy-metal pollutants from wastewater
title_sort	efficient, selective, and reusable metal–organic framework-based adsorbent for the removal of pb(ii) and cr(vi) heavy-metal pollutants from wastewater
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/503f73affdcd4bebb427572d47e8faef
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Efficient, selective, and reusable metal–organic framework-based adsorbent for the removal of Pb(II) and Cr(VI) heavy-metal pollutants from wastewater

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