Open AccessRole of additives in silica-supported polyethylenimine adsorbents for CO2 adsorption
Author(s) -
Qianxi Fang,
Weiqiu Huang,
Hongning Wang
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ab80eb
Subject(s) - polyethylenimine , ethylenediamine , adsorption , aerogel , thermal stability , grafting , polymer chemistry , mesoporous material , amine gas treating , chemistry , nuclear chemistry , mesoporous silica , materials science , inorganic chemistry , organic chemistry , polymer , catalysis , nanotechnology , transfection , biochemistry , gene
SiO 2 aerogels were prepared by sol-gel method and methyl alkylation reaction using TEOS as silicon sources. Silica-supported polyethylenimine (PEI/SiO 2 ) adsorbents for CO 2 adsorption were prepare by grafting techniques, in which mesoporous SiO 2 aerogel was loaded with PEI and organic compounds functionalized by hydroxyl or amino groups as dopants. CO 2 adsorption isotherms of PEI amine-modified SiO 2 aerogels were measured and the results show that the maximum CO 2 adsorption capacity (1.8 mmol g −1 ) was obtained over a doped SA-PEI-N-Y loaded with 45% PEI and 15% N-Y (N-[3-(Trimethoxysilyl)propyl]ethylenediamine, denoted as N-Y). In addition, SA-PEI-N-Y has stronger thermal stability than SA-PEI-60% in nitrogen from room temperature to 800 °C at a heating rate of 10 °C min −1 . It turns out that N-[3-(Trimethoxysilyl)propyl]ethylenediamine is the best dopant.