Synthesis of mesoporous silica-tethered phosphonic acid sorbents for uranium species from aqueous solutions

Oksana A. Dudarko; Chamila Gunathilake; Nilantha P. Wickramaratne; Valeriia V. Sliesarenko; Yuriy L. Zub; Joanna Górka; Sheng Dai; Mietek Jaroniec

doi:10.1016/j.colsurfa.2015.04.016

Synthesis of mesoporous silica-tethered phosphonic acid sorbents for uranium species from aqueous solutions

Oksana A. Dudarko, Chamila Gunathilake, Nilantha P. Wickramaratne, Valeriia V. Sliesarenko, Yuriy L. Zub, Joanna Górka, Sheng Dai, Mietek Jaroniec

Chemical Sciences Division

Research output: Contribution to journal › Article › peer-review

41 Scopus citations

Abstract

One-pot synthesis of highly ordered SBA-15 type silica-tethered phosphonic acid at weakly acidic pH (3.75) allows for higher loading of phosphonic functionality (up to 33%) without significant deterioration of the mesostructure. In this synthesis sodium metasilicate was used instead of tetraethylorthosilicate. The resulting samples featured high specific surface areas (362-533m²/g) and well-developed mesoporosity. The hexagonal structure and high concentration of phosphonic acid groups (1.0-3.0mmol/g) in the synthesized samples were established by XRD, TEM, EDS and elemental analysis methods. Since inexpensive sodium metasilicate was used as a source of silica, these materials can be of interest for large-scale applications. Experimental studies of the synthesized materials showed that they are effective for extraction of trace uranium species under weak basic conditions (pH 8.3), which are relevant for practical use such as uranium extraction from seawater.

Original language	English
Pages (from-to)	1-8
Number of pages	8
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	482
DOIs	https://doi.org/10.1016/j.colsurfa.2015.04.016
State	Published - Oct 5 2015

Funding

O.A.D. thanks Fulbright Scholar Program for the financial support of the present work (Grant ID 68120263, 2012-2013 ). JG and SD thank for support by the U.S. DOE NE Office .

Funders	Funder number
DOE NE Office

Keywords

Block copolymer templating
Mesoporous silica
Phosphonic acid-modified silica
Uranium recovery from seawater

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title = "Synthesis of mesoporous silica-tethered phosphonic acid sorbents for uranium species from aqueous solutions",

abstract = "One-pot synthesis of highly ordered SBA-15 type silica-tethered phosphonic acid at weakly acidic pH (3.75) allows for higher loading of phosphonic functionality (up to 33%) without significant deterioration of the mesostructure. In this synthesis sodium metasilicate was used instead of tetraethylorthosilicate. The resulting samples featured high specific surface areas (362-533m2/g) and well-developed mesoporosity. The hexagonal structure and high concentration of phosphonic acid groups (1.0-3.0mmol/g) in the synthesized samples were established by XRD, TEM, EDS and elemental analysis methods. Since inexpensive sodium metasilicate was used as a source of silica, these materials can be of interest for large-scale applications. Experimental studies of the synthesized materials showed that they are effective for extraction of trace uranium species under weak basic conditions (pH 8.3), which are relevant for practical use such as uranium extraction from seawater.",

keywords = "Block copolymer templating, Mesoporous silica, Phosphonic acid-modified silica, Uranium recovery from seawater",

author = "Dudarko, {Oksana A.} and Chamila Gunathilake and Wickramaratne, {Nilantha P.} and Sliesarenko, {Valeriia V.} and Zub, {Yuriy L.} and Joanna G{\'o}rka and Sheng Dai and Mietek Jaroniec",

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doi = "10.1016/j.colsurfa.2015.04.016",

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T1 - Synthesis of mesoporous silica-tethered phosphonic acid sorbents for uranium species from aqueous solutions

AU - Dudarko, Oksana A.

AU - Gunathilake, Chamila

AU - Wickramaratne, Nilantha P.

AU - Sliesarenko, Valeriia V.

AU - Zub, Yuriy L.

AU - Górka, Joanna

AU - Dai, Sheng

AU - Jaroniec, Mietek

PY - 2015/10/5

Y1 - 2015/10/5

N2 - One-pot synthesis of highly ordered SBA-15 type silica-tethered phosphonic acid at weakly acidic pH (3.75) allows for higher loading of phosphonic functionality (up to 33%) without significant deterioration of the mesostructure. In this synthesis sodium metasilicate was used instead of tetraethylorthosilicate. The resulting samples featured high specific surface areas (362-533m2/g) and well-developed mesoporosity. The hexagonal structure and high concentration of phosphonic acid groups (1.0-3.0mmol/g) in the synthesized samples were established by XRD, TEM, EDS and elemental analysis methods. Since inexpensive sodium metasilicate was used as a source of silica, these materials can be of interest for large-scale applications. Experimental studies of the synthesized materials showed that they are effective for extraction of trace uranium species under weak basic conditions (pH 8.3), which are relevant for practical use such as uranium extraction from seawater.

AB - One-pot synthesis of highly ordered SBA-15 type silica-tethered phosphonic acid at weakly acidic pH (3.75) allows for higher loading of phosphonic functionality (up to 33%) without significant deterioration of the mesostructure. In this synthesis sodium metasilicate was used instead of tetraethylorthosilicate. The resulting samples featured high specific surface areas (362-533m2/g) and well-developed mesoporosity. The hexagonal structure and high concentration of phosphonic acid groups (1.0-3.0mmol/g) in the synthesized samples were established by XRD, TEM, EDS and elemental analysis methods. Since inexpensive sodium metasilicate was used as a source of silica, these materials can be of interest for large-scale applications. Experimental studies of the synthesized materials showed that they are effective for extraction of trace uranium species under weak basic conditions (pH 8.3), which are relevant for practical use such as uranium extraction from seawater.

KW - Block copolymer templating

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KW - Uranium recovery from seawater

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Synthesis of mesoporous silica-tethered phosphonic acid sorbents for uranium species from aqueous solutions

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