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Facile synthesis of silica-polymer monoliths using nonionic triblock copolymer surfactant for efficient removal of radioactive pollutants from contaminated seawater.

Abdelmageed, N., El-Said, W.A., Younes, A.A., Atrees, M.S., Farag, A.B., Elshehy, E.A. and Abdelkader, A.M., 2021. Facile synthesis of silica-polymer monoliths using nonionic triblock copolymer surfactant for efficient removal of radioactive pollutants from contaminated seawater. Journal of Applied Polymer Science. (In Press)

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DOI: 10.1002/app.51263

Abstract

Here, we introduce a highly porous functional mesoscopically silica-polymer composite based on silica monolith-conjugated thiourea/formaldehyde copolymer. The developed nanostructure enables selective and fast removal of the radioactive pollutants strontium (Sr[II]) and cesium (Cs[I]) ions from contaminated seawater. The silica/polymer composite was synthesized by introducing thiourea/formaldehyde solution into tetramethoxy orthosilicate/triblock copolymer emulsion. The chemical and textural features of the synthesized silica/thiourea-formaldehyde polymer composite (SiO2-TUF) were characterized using Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscope, high-resolution transmission electron microscope, energy dispersive X-ray analysis, dynamic light scattering, thermal analysis, and N2 adsorption/desorption measurements. The synthesized microporous SiO2-TUF showed excellent cesium and strontium ions removal ability, reaching a maximum adsorption capacity of 78.2 and 40.3 mg g−1 for Sr(II) and Cs(I), respectively. When tested with seawater contaminated with radioactive cesium and strontium, SiO2-TUF was able to selectively target Sr(II) and Cs(I) ions. Among the different types of adsorption isotherms investigated, Sips isotherm showed the best fit with R2 > 0.990. The kinetic studies showed that the pseudo-second-order model gave the best description of the uptake process.

Item Type:Article
ISSN:0021-8995
Uncontrolled Keywords:Porous Materials; Silica; Polymer; Adsorption; radioactive waste.
Group:Faculty of Science & Technology
ID Code:35697
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:28 Jun 2021 14:13
Last Modified:28 Jun 2021 14:13

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