Open AccessPreparation and Characterization of Amino-Functionalized Geopolymer Microspheres
Author(s) -
M. L. Chen,
Yuanyuan Ge,
Guo-hui Xue,
Mengmeng Xu,
Xuemin Cui
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/678/1/012114
Subject(s) - geopolymer , adsorption , materials science , microsphere , aqueous solution , metal ions in aqueous solution , fourier transform infrared spectroscopy , porosity , metakaolin , chemical engineering , nuclear chemistry , metal , bet theory , specific surface area , surface modification , chemistry , organic chemistry , composite material , metallurgy , catalysis , compressive strength , engineering
Geopolymer microspheres have the advantages of environmentally friendly, cost-effective, easily to synthesize and regenerate, which can be applied for adsorption of heavy metal ions from aqueous solution. In this study, the amino-functionalized metakaolin-based geopolymer microspheres (NH 2 -MGS) were synthesized by coupling agent method using N-βaminoethyl-γ-aminopropyltrimethoxysilane (AEAPTS). The influences of AEAPTS dosage and temperature on modification efficiency were investigated in detail, and the properties of NH 2 -MGS were characterized by SEM, EDS, BET, XRD and FTIR analysis. It is shown that amino groups were grafted onto the surface of geopolymer microspheres successfully, and the amount of amino groups grafted increased as the AEAPTS dosage further increasing to 15 wt% and the temperature to 70 °C. The BET specific surface area of NH 2 -MGS increased significantly from 23.78 to 63.78 m 2 /g with a corresponding increase of micropores and porosity, which have great potential as adsorbent for removal of heavy metal ions.