Synergistic effect of carboxyl and sulfate groups for effective removal of radioactive strontium ion in a Zr-metal-organic framework

Rapid removal of radioactive strontium from nuclear wastewater is of great significance for environmental safety and human health. This work reports the effective adsorption of strontium ion in a stable dual-group metal-organic framework, Zr6(OH)14(BDC-(COOH)2)4(SO4)0.75 (Zr-BDC-COOH-SO4), which con...

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Autores principales:	Lin Ren, Xudong Zhao, Baosheng Liu, Hongliang Huang
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	adsorption dual groups electrostatic interaction metal-organic framework radioactive sr2+ Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/34abbe8148054fc8b048b71768fc50a5
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spelling	oai:doaj.org-article:34abbe8148054fc8b048b71768fc50a52021-11-06T10:56:24ZSynergistic effect of carboxyl and sulfate groups for effective removal of radioactive strontium ion in a Zr-metal-organic framework0273-12231996-973210.2166/wst.2021.103https://doaj.org/article/34abbe8148054fc8b048b71768fc50a52021-04-01T00:00:00Zhttp://wst.iwaponline.com/content/83/8/2001https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Rapid removal of radioactive strontium from nuclear wastewater is of great significance for environmental safety and human health. This work reports the effective adsorption of strontium ion in a stable dual-group metal-organic framework, Zr6(OH)14(BDC-(COOH)2)4(SO4)0.75 (Zr-BDC-COOH-SO4), which contains strontium-chelating groups (-COOH and SO4) and a strongly ionizable group (-COOH). Zr-BDC-COOH-SO4 exhibits very rapid adsorption kinetics (<5 min) and a maximum adsorption capacity of 67.5 mg g−1. The adsorption behaviors can be well fitted to the pseudo-second-order model and the Langmuir isotherm model. Further investigations indicate that the adsorption of Sr2+ onto Zr-BDC-COOH-SO4 would not be obviously affected by solution pH and adsorption temperature. The feasible regeneration of the adsorbent was also demonstrated using a simple elution method. Mechanism investigation suggests that free -COOH contributes to the rapid adsorption based on electrostatic interaction, while the introduction of -SO4 significantly enhanced the adsorption capacity. Thus, these results suggest that Zr-BDC-COOH-SO4 is a potential candidate for Sr2+ removal. They also introduce dual groups as an effective strategy for designing high-efficiency adsorbents. HIGHLIGHTS A dual-group (-COOH and -SO4) metal-organic framework was used to adsorb radioactive Sr2+.; Very rapid adsorption kinetics of <5 min was obtained for the adsorbent.; Large numbers of free carboxyl groups contribute to the fast adsorption.; Introduction of -SO4 significantly enhances the adsorption capacity.; The adsorbent exhibits a good anti-interference ability in terms of temperature and pH.;Lin RenXudong ZhaoBaosheng LiuHongliang HuangIWA Publishingarticleadsorptiondual groupselectrostatic interactionmetal-organic frameworkradioactive sr2+Environmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 83, Iss 8, Pp 2001-2011 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	adsorption dual groups electrostatic interaction metal-organic framework radioactive sr2+ Environmental technology. Sanitary engineering TD1-1066
spellingShingle	adsorption dual groups electrostatic interaction metal-organic framework radioactive sr2+ Environmental technology. Sanitary engineering TD1-1066 Lin Ren Xudong Zhao Baosheng Liu Hongliang Huang Synergistic effect of carboxyl and sulfate groups for effective removal of radioactive strontium ion in a Zr-metal-organic framework
description	Rapid removal of radioactive strontium from nuclear wastewater is of great significance for environmental safety and human health. This work reports the effective adsorption of strontium ion in a stable dual-group metal-organic framework, Zr6(OH)14(BDC-(COOH)2)4(SO4)0.75 (Zr-BDC-COOH-SO4), which contains strontium-chelating groups (-COOH and SO4) and a strongly ionizable group (-COOH). Zr-BDC-COOH-SO4 exhibits very rapid adsorption kinetics (<5 min) and a maximum adsorption capacity of 67.5 mg g−1. The adsorption behaviors can be well fitted to the pseudo-second-order model and the Langmuir isotherm model. Further investigations indicate that the adsorption of Sr2+ onto Zr-BDC-COOH-SO4 would not be obviously affected by solution pH and adsorption temperature. The feasible regeneration of the adsorbent was also demonstrated using a simple elution method. Mechanism investigation suggests that free -COOH contributes to the rapid adsorption based on electrostatic interaction, while the introduction of -SO4 significantly enhanced the adsorption capacity. Thus, these results suggest that Zr-BDC-COOH-SO4 is a potential candidate for Sr2+ removal. They also introduce dual groups as an effective strategy for designing high-efficiency adsorbents. HIGHLIGHTS A dual-group (-COOH and -SO4) metal-organic framework was used to adsorb radioactive Sr2+.; Very rapid adsorption kinetics of <5 min was obtained for the adsorbent.; Large numbers of free carboxyl groups contribute to the fast adsorption.; Introduction of -SO4 significantly enhances the adsorption capacity.; The adsorbent exhibits a good anti-interference ability in terms of temperature and pH.;
format	article
author	Lin Ren Xudong Zhao Baosheng Liu Hongliang Huang
author_facet	Lin Ren Xudong Zhao Baosheng Liu Hongliang Huang
author_sort	Lin Ren
title	Synergistic effect of carboxyl and sulfate groups for effective removal of radioactive strontium ion in a Zr-metal-organic framework
title_short	Synergistic effect of carboxyl and sulfate groups for effective removal of radioactive strontium ion in a Zr-metal-organic framework
title_full	Synergistic effect of carboxyl and sulfate groups for effective removal of radioactive strontium ion in a Zr-metal-organic framework
title_fullStr	Synergistic effect of carboxyl and sulfate groups for effective removal of radioactive strontium ion in a Zr-metal-organic framework
title_full_unstemmed	Synergistic effect of carboxyl and sulfate groups for effective removal of radioactive strontium ion in a Zr-metal-organic framework
title_sort	synergistic effect of carboxyl and sulfate groups for effective removal of radioactive strontium ion in a zr-metal-organic framework
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/34abbe8148054fc8b048b71768fc50a5
work_keys_str_mv	AT linren synergisticeffectofcarboxylandsulfategroupsforeffectiveremovalofradioactivestrontiumioninazrmetalorganicframework AT xudongzhao synergisticeffectofcarboxylandsulfategroupsforeffectiveremovalofradioactivestrontiumioninazrmetalorganicframework AT baoshengliu synergisticeffectofcarboxylandsulfategroupsforeffectiveremovalofradioactivestrontiumioninazrmetalorganicframework AT honglianghuang synergisticeffectofcarboxylandsulfategroupsforeffectiveremovalofradioactivestrontiumioninazrmetalorganicframework
_version_	1718443722861969408

Synergistic effect of carboxyl and sulfate groups for effective removal of radioactive strontium ion in a Zr-metal-organic framework

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