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Hydrophobic Modification of ZrO(2)-SiO(2) Xerogel and Its Adsorption Properties to Rhodamine B

Zirconium nitrate pentahydrate (Zr(NO(3))(4)·5H(2)O) and tetraethyl orthosilicate (TEOS) are used as the zirconium source and silicon source, respectively, and methyltriethoxysilane (MTES) as the hydrophobic modifier; the hydrophilic and hydrophobic ZrO(2)-SiO(2) xerogels were prepared successfully....

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Autores principales: Liu, Yan, Yang, Jing
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9602328/
https://www.ncbi.nlm.nih.gov/pubmed/36286176
http://dx.doi.org/10.3390/gels8100675
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author Liu, Yan
Yang, Jing
author_facet Liu, Yan
Yang, Jing
author_sort Liu, Yan
collection PubMed
description Zirconium nitrate pentahydrate (Zr(NO(3))(4)·5H(2)O) and tetraethyl orthosilicate (TEOS) are used as the zirconium source and silicon source, respectively, and methyltriethoxysilane (MTES) as the hydrophobic modifier; the hydrophilic and hydrophobic ZrO(2)-SiO(2) xerogels were prepared successfully. The xerogels were characterized using Fourier transform infrared spectra (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and N(2) adsorption–desorption measurement. The adsorption mechanism of hydrophobic ZrO(2)-SiO(2) xerogels to RhB was described by the kinetic and adsorption isotherms. The results showed that the introduction of Si-CH(3) groups can make the average pore size, BET surface area, and total pore volume of ZrO(2)-SiO(2) xerogel increase. The hydrophobic ZrO(2)-SiO(2) xerogel displays an adsorption capacity of 169.23 mg·g(−1) for RhB dye at 25 °C and pH = 3. The adsorption process of hydrophobic ZrO(2)-SiO(2) xerogel to RhB followed a pseudo–second-order kinetic model. Fitting results from the D–R model of adsorption indicate that the adsorption of RhB onto the hydrophobic ZrO(2)-SiO(2) xerogels is mainly physical, accompanied by a spontaneous heat absorption process. The regeneration and recycling properties of hydrophobic xerogels were investigated, and their recoverability and reusability were demonstrated.
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spelling pubmed-96023282022-10-27 Hydrophobic Modification of ZrO(2)-SiO(2) Xerogel and Its Adsorption Properties to Rhodamine B Liu, Yan Yang, Jing Gels Article Zirconium nitrate pentahydrate (Zr(NO(3))(4)·5H(2)O) and tetraethyl orthosilicate (TEOS) are used as the zirconium source and silicon source, respectively, and methyltriethoxysilane (MTES) as the hydrophobic modifier; the hydrophilic and hydrophobic ZrO(2)-SiO(2) xerogels were prepared successfully. The xerogels were characterized using Fourier transform infrared spectra (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and N(2) adsorption–desorption measurement. The adsorption mechanism of hydrophobic ZrO(2)-SiO(2) xerogels to RhB was described by the kinetic and adsorption isotherms. The results showed that the introduction of Si-CH(3) groups can make the average pore size, BET surface area, and total pore volume of ZrO(2)-SiO(2) xerogel increase. The hydrophobic ZrO(2)-SiO(2) xerogel displays an adsorption capacity of 169.23 mg·g(−1) for RhB dye at 25 °C and pH = 3. The adsorption process of hydrophobic ZrO(2)-SiO(2) xerogel to RhB followed a pseudo–second-order kinetic model. Fitting results from the D–R model of adsorption indicate that the adsorption of RhB onto the hydrophobic ZrO(2)-SiO(2) xerogels is mainly physical, accompanied by a spontaneous heat absorption process. The regeneration and recycling properties of hydrophobic xerogels were investigated, and their recoverability and reusability were demonstrated. MDPI 2022-10-20 /pmc/articles/PMC9602328/ /pubmed/36286176 http://dx.doi.org/10.3390/gels8100675 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Liu, Yan
Yang, Jing
Hydrophobic Modification of ZrO(2)-SiO(2) Xerogel and Its Adsorption Properties to Rhodamine B
title Hydrophobic Modification of ZrO(2)-SiO(2) Xerogel and Its Adsorption Properties to Rhodamine B
title_full Hydrophobic Modification of ZrO(2)-SiO(2) Xerogel and Its Adsorption Properties to Rhodamine B
title_fullStr Hydrophobic Modification of ZrO(2)-SiO(2) Xerogel and Its Adsorption Properties to Rhodamine B
title_full_unstemmed Hydrophobic Modification of ZrO(2)-SiO(2) Xerogel and Its Adsorption Properties to Rhodamine B
title_short Hydrophobic Modification of ZrO(2)-SiO(2) Xerogel and Its Adsorption Properties to Rhodamine B
title_sort hydrophobic modification of zro(2)-sio(2) xerogel and its adsorption properties to rhodamine b
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9602328/
https://www.ncbi.nlm.nih.gov/pubmed/36286176
http://dx.doi.org/10.3390/gels8100675
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