Comparison of adsorption properties of commercial silica and rice husk ash (RHA) silica: A study by NIR spectroscopy

Adsorption properties of Silica gel (commercial silica), rice husk ash (RHA) silica, and their hydrothermally treated products towards water molecules were studied in this work. RHA silica was prepared by heating rice husk to 650°C for 4 h after pretreatment with hydrochloric acid. Portions of the s...

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Autores principales:	Chirsty Alfred A., Sivarukshy Pathmanathan
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	adsorption commercial silica gel rice husk ash silica gel near infrared spectroscopy gravimetry thermal treatment Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/b126bd1a49c24df497bdb00a4168ea89
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spelling	oai:doaj.org-article:b126bd1a49c24df497bdb00a4168ea892021-12-05T14:10:44ZComparison of adsorption properties of commercial silica and rice husk ash (RHA) silica: A study by NIR spectroscopy2391-542010.1515/chem-2021-0044https://doaj.org/article/b126bd1a49c24df497bdb00a4168ea892021-03-01T00:00:00Zhttps://doi.org/10.1515/chem-2021-0044https://doaj.org/toc/2391-5420Adsorption properties of Silica gel (commercial silica), rice husk ash (RHA) silica, and their hydrothermally treated products towards water molecules were studied in this work. RHA silica was prepared by heating rice husk to 650°C for 4 h after pretreatment with hydrochloric acid. Portions of the samples of silica were evacuated at 200℃ and then allowed to adsorb water molecules from the surrounding air at either 42 or 50% humidity. The near infrared spectra of these samples were measured at different time intervals during their adsorption of water molecules. The evolved near infrared spectra were analyzed using second derivative techniques. Adsorption properties of these samples were further studied by gravimetric analysis. Surface functionalities and adsorption evolution of water molecules on silica samples studied showed that the adsorption of water molecules on commercial silica gel sample and RHA silica Samples takes place readily with hydrogen-bonded silanol groups on the surfaces of the samples. This adsorption arising from the OH stretching and bending vibrations of these water molecules gives rise to a band at 5,270 cm−1 in the near infrared region. The adsorbed water molecules then continue at the free silanol groups which is indicated by the absorption around 5,314 cm−1. The results clearly show that the silica made from rice husk adsorb water in the same manner as the commercial silica, but the quantity of water molecules adsorbed is less compared to commercial silica used in this experiment. However, the study clearly shows that the rice husk silica can replace the commercial silica as a substitute for desiccant purposes in industry.Chirsty Alfred A.Sivarukshy PathmanathanDe Gruyterarticleadsorptioncommercial silica gelrice husk ash silica gelnear infrared spectroscopygravimetrythermal treatmentChemistryQD1-999ENOpen Chemistry, Vol 19, Iss 1, Pp 426-431 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	adsorption commercial silica gel rice husk ash silica gel near infrared spectroscopy gravimetry thermal treatment Chemistry QD1-999
spellingShingle	adsorption commercial silica gel rice husk ash silica gel near infrared spectroscopy gravimetry thermal treatment Chemistry QD1-999 Chirsty Alfred A. Sivarukshy Pathmanathan Comparison of adsorption properties of commercial silica and rice husk ash (RHA) silica: A study by NIR spectroscopy
description	Adsorption properties of Silica gel (commercial silica), rice husk ash (RHA) silica, and their hydrothermally treated products towards water molecules were studied in this work. RHA silica was prepared by heating rice husk to 650°C for 4 h after pretreatment with hydrochloric acid. Portions of the samples of silica were evacuated at 200℃ and then allowed to adsorb water molecules from the surrounding air at either 42 or 50% humidity. The near infrared spectra of these samples were measured at different time intervals during their adsorption of water molecules. The evolved near infrared spectra were analyzed using second derivative techniques. Adsorption properties of these samples were further studied by gravimetric analysis. Surface functionalities and adsorption evolution of water molecules on silica samples studied showed that the adsorption of water molecules on commercial silica gel sample and RHA silica Samples takes place readily with hydrogen-bonded silanol groups on the surfaces of the samples. This adsorption arising from the OH stretching and bending vibrations of these water molecules gives rise to a band at 5,270 cm−1 in the near infrared region. The adsorbed water molecules then continue at the free silanol groups which is indicated by the absorption around 5,314 cm−1. The results clearly show that the silica made from rice husk adsorb water in the same manner as the commercial silica, but the quantity of water molecules adsorbed is less compared to commercial silica used in this experiment. However, the study clearly shows that the rice husk silica can replace the commercial silica as a substitute for desiccant purposes in industry.
format	article
author	Chirsty Alfred A. Sivarukshy Pathmanathan
author_facet	Chirsty Alfred A. Sivarukshy Pathmanathan
author_sort	Chirsty Alfred A.
title	Comparison of adsorption properties of commercial silica and rice husk ash (RHA) silica: A study by NIR spectroscopy
title_short	Comparison of adsorption properties of commercial silica and rice husk ash (RHA) silica: A study by NIR spectroscopy
title_full	Comparison of adsorption properties of commercial silica and rice husk ash (RHA) silica: A study by NIR spectroscopy
title_fullStr	Comparison of adsorption properties of commercial silica and rice husk ash (RHA) silica: A study by NIR spectroscopy
title_full_unstemmed	Comparison of adsorption properties of commercial silica and rice husk ash (RHA) silica: A study by NIR spectroscopy
title_sort	comparison of adsorption properties of commercial silica and rice husk ash (rha) silica: a study by nir spectroscopy
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/b126bd1a49c24df497bdb00a4168ea89
work_keys_str_mv	AT chirstyalfreda comparisonofadsorptionpropertiesofcommercialsilicaandricehuskashrhasilicaastudybynirspectroscopy AT sivarukshypathmanathan comparisonofadsorptionpropertiesofcommercialsilicaandricehuskashrhasilicaastudybynirspectroscopy
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Comparison of adsorption properties of commercial silica and rice husk ash (RHA) silica: A study by NIR spectroscopy

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