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Journal of Sol-Gel Science and Technology
Published in: Journal of Sol-Gel Science and Technology 2/2021

11-03-2021 | Original Paper: Sol–gel and hybrid materials with surface modification for applications

Fabrication of methyl acrylate modified silica aerogel for capture of Cu2+ from aqueous solutions

Authors: Ting Liu, Qun Liu, Yuan Liu, Hang Yao, Zhihua Zhang, Xiaodong Wang, Jun Shen

Published in: Journal of Sol-Gel Science and Technology | Issue 2/2021

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Abstract

With SiO2 gel as the main skeleton material, the surface modification with methyl acrylate (MA) and tetraethylenepentamine (TEPA) was carried out by Michael addition and substitution reaction, after CO2 supercritical drying TEPA and MA modified SiO2 aerogel (TEPA–MA–SA aerogel) was obtained. The sample exhibited selectivity and enormous adsorption capacities for Cu2+ (218.57 mg g–1). The removal rate of Cu2+ in ternary-mixed metal solution reached 49.29%, ranking first among the materials we have known. MA and TEPA both contain rich groups such as –NH2 and –NH–, which provide abundant adsorption sites for adsorbing heavy metal ions. BET test showed that the specific surface area, the pore volume, and the pore diameter was 190.2 m2 g−1, 4.426 cm3 g−1 and 9.306 nm respectively. The above properties facilitated capture for Cu (II). The adsorption data were fitted with Langmuir and Freundlich adsorption isotherm models, and both models could describe the adsorption process. However, according to the fitting parameters, Langmuir adsorption isotherm model explicates the adsorption process better. Although the pore structure and specific surface area are beneficial to the physical adsorption, chemical chelation still plays a major role. XPS analysis further proved the possible adsorption mechanism that N and O atoms adsorb Cu (II) ions through chelation. Altogether, TEPA–MA–SA aerogel is suitable as an auxiliary adsorbent to purify contaminated water.
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Metadata
Title
Fabrication of methyl acrylate modified silica aerogel for capture of Cu2+ from aqueous solutions
Authors
Ting Liu
Qun Liu
Yuan Liu
Hang Yao
Zhihua Zhang
Xiaodong Wang
Jun Shen
Publication date
11-03-2021
Publisher
Springer US
Published in
Journal of Sol-Gel Science and Technology / Issue 2/2021
Print ISSN: 0928-0707
Electronic ISSN: 1573-4846
DOI
https://doi.org/10.1007/s10971-021-05499-w

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