Isotherm and selectivity study of Ni(II) removal using natural and acid-activated nanobentonites

In this research, natural bentonite and its acid-activated forms were employed as adsorbents for the adsorption of Ni2+ ions from wastewater. Natural bentonite was activated with 2 M sulfuric acid, 4.5 h and 95 °C (the best acid-activated sample with the highest adsorption capacity) and the other 6...

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Autores principales:	Zahra Ashouri Mehranjani, Majid Hayati-Ashtiani, Mehran Rezaei
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	acid-activated bentonite nanoporous nickel selectivity Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/764d94369f78463f8b2e8fb05959d45a
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spelling	oai:doaj.org-article:764d94369f78463f8b2e8fb05959d45a2021-11-23T18:40:58ZIsotherm and selectivity study of Ni(II) removal using natural and acid-activated nanobentonites0273-12231996-973210.2166/wst.2021.435https://doaj.org/article/764d94369f78463f8b2e8fb05959d45a2021-11-01T00:00:00Zhttp://wst.iwaponline.com/content/84/9/2394https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732In this research, natural bentonite and its acid-activated forms were employed as adsorbents for the adsorption of Ni2+ ions from wastewater. Natural bentonite was activated with 2 M sulfuric acid, 4.5 h and 95 °C (the best acid-activated sample with the highest adsorption capacity) and the other 6 M sulfuric acid, 7.5 h and 95 °C (the worst acid-activated sample with the lowest adsorption capacity). The adsorption of Ni2+ was studied through experiments including equilibrium contact time and selectivity. The equilibrium contact time for bentonite was obtained at 180 min. The Ni2+ separation process along with Zn2+ selectivity studies was considered through adsorption experiments. The results showed that there was a maximum amount of Ni2+ adsorption in the absence of Zn2+ for all samples. The results showed the best ﬁt is obtained with the pseudo-second-order kinetic model. Working out different bentonite types to determine the best kinetic models, we explored the Langmuir and Florry–Huggins models provided a good fit with experimental data for acid-activated bentonites and the best results from linear forms of the adsorption isotherm models for fitting the experimental data of natural bentonite are obtained for Langmuir, Temkin and Freundlich models. HIGHLIGHTS Working out different nanobentonite types to determine the best kinetic models.; Investigating special acid-activated nanobentonite through Ni adsorption isotherms.; New approach to study Ni separation process through a modeling provided.;Zahra Ashouri MehranjaniMajid Hayati-AshtianiMehran RezaeiIWA Publishingarticleacid-activatedbentonitenanoporousnickelselectivityEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 84, Iss 9, Pp 2394-2405 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	acid-activated bentonite nanoporous nickel selectivity Environmental technology. Sanitary engineering TD1-1066
spellingShingle	acid-activated bentonite nanoporous nickel selectivity Environmental technology. Sanitary engineering TD1-1066 Zahra Ashouri Mehranjani Majid Hayati-Ashtiani Mehran Rezaei Isotherm and selectivity study of Ni(II) removal using natural and acid-activated nanobentonites
description	In this research, natural bentonite and its acid-activated forms were employed as adsorbents for the adsorption of Ni2+ ions from wastewater. Natural bentonite was activated with 2 M sulfuric acid, 4.5 h and 95 °C (the best acid-activated sample with the highest adsorption capacity) and the other 6 M sulfuric acid, 7.5 h and 95 °C (the worst acid-activated sample with the lowest adsorption capacity). The adsorption of Ni2+ was studied through experiments including equilibrium contact time and selectivity. The equilibrium contact time for bentonite was obtained at 180 min. The Ni2+ separation process along with Zn2+ selectivity studies was considered through adsorption experiments. The results showed that there was a maximum amount of Ni2+ adsorption in the absence of Zn2+ for all samples. The results showed the best ﬁt is obtained with the pseudo-second-order kinetic model. Working out different bentonite types to determine the best kinetic models, we explored the Langmuir and Florry–Huggins models provided a good fit with experimental data for acid-activated bentonites and the best results from linear forms of the adsorption isotherm models for fitting the experimental data of natural bentonite are obtained for Langmuir, Temkin and Freundlich models. HIGHLIGHTS Working out different nanobentonite types to determine the best kinetic models.; Investigating special acid-activated nanobentonite through Ni adsorption isotherms.; New approach to study Ni separation process through a modeling provided.;
format	article
author	Zahra Ashouri Mehranjani Majid Hayati-Ashtiani Mehran Rezaei
author_facet	Zahra Ashouri Mehranjani Majid Hayati-Ashtiani Mehran Rezaei
author_sort	Zahra Ashouri Mehranjani
title	Isotherm and selectivity study of Ni(II) removal using natural and acid-activated nanobentonites
title_short	Isotherm and selectivity study of Ni(II) removal using natural and acid-activated nanobentonites
title_full	Isotherm and selectivity study of Ni(II) removal using natural and acid-activated nanobentonites
title_fullStr	Isotherm and selectivity study of Ni(II) removal using natural and acid-activated nanobentonites
title_full_unstemmed	Isotherm and selectivity study of Ni(II) removal using natural and acid-activated nanobentonites
title_sort	isotherm and selectivity study of ni(ii) removal using natural and acid-activated nanobentonites
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/764d94369f78463f8b2e8fb05959d45a
work_keys_str_mv	AT zahraashourimehranjani isothermandselectivitystudyofniiiremovalusingnaturalandacidactivatednanobentonites AT majidhayatiashtiani isothermandselectivitystudyofniiiremovalusingnaturalandacidactivatednanobentonites AT mehranrezaei isothermandselectivitystudyofniiiremovalusingnaturalandacidactivatednanobentonites
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Isotherm and selectivity study of Ni(II) removal using natural and acid-activated nanobentonites

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