Open AccessSynthesis and characterization of secondary amine-functionalized silica for CO2 capture
Author(s) -
Abdul Rahman Abdul Rahim,
Tay Tze Hao,
Ahmad Aizat Wan Azhari,
Norasikin Saman,
Hanapi Mat,
Khairiraihanna Johari
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/765/1/012091
Subject(s) - tetraethyl orthosilicate , amine gas treating , adsorption , bromide , chemistry , fourier transform infrared spectroscopy , hydrolysis , pulmonary surfactant , emulsion , inorganic chemistry , nuclear chemistry , chemical engineering , organic chemistry , biochemistry , engineering
As one of commonly used technique for carbon dioxide (CO 2 ) removal, amine-absorption also required high amounts of energy for adsorbent regeneration and problems of equipment corrosion during chemical holding may happened. Alternatively, amine-impregnated solid adsorbent received wide attention for CO 2 removal. However, there are limitations on the adsorbents’ adsorption capacity and their hydrolytic stability. In this study, amine-functionalized silica (T-Si) adsorbent was synthesized via oil-in-water emulsion technique using centrimonium bromide (CTAB) as surfactant, ethanol as oil phase, and tetraethyl orthosilicate (TEOS) as silica precursor followed with impregnation with secondary amine (tetraethyl pentamine, TEPA). Results indicated that T-Si 2 adsorbent has a surface area of 10.7338 m 2 /g, presence of amine group (N-H) peaks in the FTIR spectra, and is thermally stable up to temperature of 170°C. CO 2 adsorption study also shows that the T-Si also performed higher adsorption capacity (0.63 mmol/g) towards CO 2 compared to the blank Si adsorbent (0.33 mmol/g). The obtained experimental data show a good fitting into Sips adsorption isotherm which indicate a multilayer adsorption that happen on a heterogenous surface. The findings of this study show that the introduction of amine groups from TEPA offers improvement towards CO 2 capture due to the reaction with amine groups.