Removal of methylene blue from aqueous solutions by adsorption on amorphous silicon dioxide from rice husks

This study shows the effect of conditions on methylene blue sorption from aqueous solutions using amorphous silicon dioxide obtained from rice husk by oxidative roasting with and without pre-treatment with 0.1 M HCl. Adsorption activity for methylene blue increases with increasing pH, reaching its m...

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Autores principales:	O. D. Arefieva, L. A. Zemnukhova, V. A. Gorlova, M. A. Tsvetnov
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	adsorption kinetics methylene blue rice husk silica thermodynamics Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/a9d991a7b46248caa2e1cfc4770d90f9
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spelling	oai:doaj.org-article:a9d991a7b46248caa2e1cfc4770d90f92021-11-05T21:09:26ZRemoval of methylene blue from aqueous solutions by adsorption on amorphous silicon dioxide from rice husks1751-231X10.2166/wpt.2020.117https://doaj.org/article/a9d991a7b46248caa2e1cfc4770d90f92021-04-01T00:00:00Zhttp://wpt.iwaponline.com/content/16/2/351https://doaj.org/toc/1751-231XThis study shows the effect of conditions on methylene blue sorption from aqueous solutions using amorphous silicon dioxide obtained from rice husk by oxidative roasting with and without pre-treatment with 0.1 M HCl. Adsorption activity for methylene blue increases with increasing pH, reaching its maximum above the point of zero charge. Thermodynamic parameter values (ΔG298 > 0, ΔH < 0, ΔS > 0) indicate that methylene blue adsorption is exothermic and occurs with an increase in molecular mobility in the adsorption layer. The process is described by the Freundlich and Dubinin-Astakhov equations, which indicates that it is determined by both electrostatic interaction with active centers on the surface and the volumetric filling of micropores. Highlights Characterization of the rice husk ash with different silica contents.; The study of the effect of conditions on the sorption of methylene blue from aqueous solutions.; The mechanism of adsorption of methylene blue by silicon-containing sorbents from rice husk.;O. D. ArefievaL. A. ZemnukhovaV. A. GorlovaM. A. TsvetnovIWA Publishingarticleadsorptionkineticsmethylene bluerice husksilicathermodynamicsEnvironmental technology. Sanitary engineeringTD1-1066ENWater Practice and Technology, Vol 16, Iss 2, Pp 351-363 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	adsorption kinetics methylene blue rice husk silica thermodynamics Environmental technology. Sanitary engineering TD1-1066
spellingShingle	adsorption kinetics methylene blue rice husk silica thermodynamics Environmental technology. Sanitary engineering TD1-1066 O. D. Arefieva L. A. Zemnukhova V. A. Gorlova M. A. Tsvetnov Removal of methylene blue from aqueous solutions by adsorption on amorphous silicon dioxide from rice husks
description	This study shows the effect of conditions on methylene blue sorption from aqueous solutions using amorphous silicon dioxide obtained from rice husk by oxidative roasting with and without pre-treatment with 0.1 M HCl. Adsorption activity for methylene blue increases with increasing pH, reaching its maximum above the point of zero charge. Thermodynamic parameter values (ΔG298 > 0, ΔH < 0, ΔS > 0) indicate that methylene blue adsorption is exothermic and occurs with an increase in molecular mobility in the adsorption layer. The process is described by the Freundlich and Dubinin-Astakhov equations, which indicates that it is determined by both electrostatic interaction with active centers on the surface and the volumetric filling of micropores. Highlights Characterization of the rice husk ash with different silica contents.; The study of the effect of conditions on the sorption of methylene blue from aqueous solutions.; The mechanism of adsorption of methylene blue by silicon-containing sorbents from rice husk.;
format	article
author	O. D. Arefieva L. A. Zemnukhova V. A. Gorlova M. A. Tsvetnov
author_facet	O. D. Arefieva L. A. Zemnukhova V. A. Gorlova M. A. Tsvetnov
author_sort	O. D. Arefieva
title	Removal of methylene blue from aqueous solutions by adsorption on amorphous silicon dioxide from rice husks
title_short	Removal of methylene blue from aqueous solutions by adsorption on amorphous silicon dioxide from rice husks
title_full	Removal of methylene blue from aqueous solutions by adsorption on amorphous silicon dioxide from rice husks
title_fullStr	Removal of methylene blue from aqueous solutions by adsorption on amorphous silicon dioxide from rice husks
title_full_unstemmed	Removal of methylene blue from aqueous solutions by adsorption on amorphous silicon dioxide from rice husks
title_sort	removal of methylene blue from aqueous solutions by adsorption on amorphous silicon dioxide from rice husks
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/a9d991a7b46248caa2e1cfc4770d90f9
work_keys_str_mv	AT odarefieva removalofmethylenebluefromaqueoussolutionsbyadsorptiononamorphoussilicondioxidefromricehusks AT lazemnukhova removalofmethylenebluefromaqueoussolutionsbyadsorptiononamorphoussilicondioxidefromricehusks AT vagorlova removalofmethylenebluefromaqueoussolutionsbyadsorptiononamorphoussilicondioxidefromricehusks AT matsvetnov removalofmethylenebluefromaqueoussolutionsbyadsorptiononamorphoussilicondioxidefromricehusks
_version_	1718444057415385088

Removal of methylene blue from aqueous solutions by adsorption on amorphous silicon dioxide from rice husks

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