Chitosan coated - porous low expansion vermiculite for efficient removal of cesium from radioactive wastewater

Radioactive elements have very important applications in practical life and work. The long-lived 137Cs has a half-life of 30.2 years, it is easily absorbed by the human body. At present, the treatment methods of 137Cs are mainly adsorption, ion exchange, co-precipitation and membrane separation tech...

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Autores principales:	Bo Zhang, Baohua Zhang, Xiaowen Liu
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2021
Materias:	Radioactive cesium Covalent grafting Porous adsorbent material Maximum desorption rate Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/05f2db000f1c461189fc7c3ca959d84c
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spelling	oai:doaj.org-article:05f2db000f1c461189fc7c3ca959d84c2021-11-16T04:11:16ZChitosan coated - porous low expansion vermiculite for efficient removal of cesium from radioactive wastewater2590-182610.1016/j.enceco.2021.05.001https://doaj.org/article/05f2db000f1c461189fc7c3ca959d84c2021-01-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2590182621000126https://doaj.org/toc/2590-1826Radioactive elements have very important applications in practical life and work. The long-lived 137Cs has a half-life of 30.2 years, it is easily absorbed by the human body. At present, the treatment methods of 137Cs are mainly adsorption, ion exchange, co-precipitation and membrane separation technology. Among them, the adsorption method is widely used because of its low cost and easy availability, and with the continuous upgrading and improvement of the removal methods, the removal cost is also rising, so it is important to develop inexpensive and high removal rate adsorbent materials. Based on this, porous adsorbents made of pre‑sodiumed low expansion vermiculite modified by urea porogenesis and polyglutamic acid covalent grafting followed by chitosan coating had been used to remove Cs+. The proposed adsorbent was successfully applied for radioactive Cs removal to be used as the potential candidate in Fukushima nuclear wastewater treatment. It showed that the porous expanded vermiculite modified with low swelling, with urea as porogen and polyglutamic acid added to increase the negative charge vacancies on the expanded vermiculite surface, could greatly improve the chemisorption capacity of Cs+ after chitosan coating. The maximum removal rate for radioactive 137Cs+ was 97.91%, and 89.89% of 137Cs+ could be effectively removed in 0.5 h. Even in the presence of competing ions such as K+, the adsorbent material still has a good adsorption effect. The maximum desorption rate of 98.43% was achieved after elution by CaCl2.Bo ZhangBaohua ZhangXiaowen LiuKeAi Communications Co., Ltd.articleRadioactive cesiumCovalent graftingPorous adsorbent materialMaximum desorption rateEnvironmental technology. Sanitary engineeringTD1-1066ENEnvironmental Chemistry and Ecotoxicology, Vol 3, Iss , Pp 182-196 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Radioactive cesium Covalent grafting Porous adsorbent material Maximum desorption rate Environmental technology. Sanitary engineering TD1-1066
spellingShingle	Radioactive cesium Covalent grafting Porous adsorbent material Maximum desorption rate Environmental technology. Sanitary engineering TD1-1066 Bo Zhang Baohua Zhang Xiaowen Liu Chitosan coated - porous low expansion vermiculite for efficient removal of cesium from radioactive wastewater
description	Radioactive elements have very important applications in practical life and work. The long-lived 137Cs has a half-life of 30.2 years, it is easily absorbed by the human body. At present, the treatment methods of 137Cs are mainly adsorption, ion exchange, co-precipitation and membrane separation technology. Among them, the adsorption method is widely used because of its low cost and easy availability, and with the continuous upgrading and improvement of the removal methods, the removal cost is also rising, so it is important to develop inexpensive and high removal rate adsorbent materials. Based on this, porous adsorbents made of pre‑sodiumed low expansion vermiculite modified by urea porogenesis and polyglutamic acid covalent grafting followed by chitosan coating had been used to remove Cs+. The proposed adsorbent was successfully applied for radioactive Cs removal to be used as the potential candidate in Fukushima nuclear wastewater treatment. It showed that the porous expanded vermiculite modified with low swelling, with urea as porogen and polyglutamic acid added to increase the negative charge vacancies on the expanded vermiculite surface, could greatly improve the chemisorption capacity of Cs+ after chitosan coating. The maximum removal rate for radioactive 137Cs+ was 97.91%, and 89.89% of 137Cs+ could be effectively removed in 0.5 h. Even in the presence of competing ions such as K+, the adsorbent material still has a good adsorption effect. The maximum desorption rate of 98.43% was achieved after elution by CaCl2.
format	article
author	Bo Zhang Baohua Zhang Xiaowen Liu
author_facet	Bo Zhang Baohua Zhang Xiaowen Liu
author_sort	Bo Zhang
title	Chitosan coated - porous low expansion vermiculite for efficient removal of cesium from radioactive wastewater
title_short	Chitosan coated - porous low expansion vermiculite for efficient removal of cesium from radioactive wastewater
title_full	Chitosan coated - porous low expansion vermiculite for efficient removal of cesium from radioactive wastewater
title_fullStr	Chitosan coated - porous low expansion vermiculite for efficient removal of cesium from radioactive wastewater
title_full_unstemmed	Chitosan coated - porous low expansion vermiculite for efficient removal of cesium from radioactive wastewater
title_sort	chitosan coated - porous low expansion vermiculite for efficient removal of cesium from radioactive wastewater
publisher	KeAi Communications Co., Ltd.
publishDate	2021
url	https://doaj.org/article/05f2db000f1c461189fc7c3ca959d84c
work_keys_str_mv	AT bozhang chitosancoatedporouslowexpansionvermiculiteforefficientremovalofcesiumfromradioactivewastewater AT baohuazhang chitosancoatedporouslowexpansionvermiculiteforefficientremovalofcesiumfromradioactivewastewater AT xiaowenliu chitosancoatedporouslowexpansionvermiculiteforefficientremovalofcesiumfromradioactivewastewater
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Chitosan coated - porous low expansion vermiculite for efficient removal of cesium from radioactive wastewater

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