Polyvinylamine-loaded metal–organic framework MIL-101 for effective and selective CO2 adsorption under atmospheric or lower pressure

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2020-06, Vol.389, p.123429, Article 123429
• Main Authors: Shin, Subin, Yoo, Dong Kyu, Bae, Youn-Sang, Jhung, Sung Hwa
• Format: Article
• Language: English
• Subjects: Adsorption; CO2; Metal organic frameworks; MIL-101; Polyvinylamine
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2019.123429

[Display omitted] •Polyvinylamine was synthesized firstly inside of MOF for selective adsorption/capture of CO2.•The CO2 adsorption performances were increased remarkably with polymer loading.•The selectivity (CO2/N2) of polyvinylamine@MIL-101 was 11 times to that of MIL-101.•The polyvinylamine@MIL-101 had preferable adsorption energy in very wide range of qe.•New adsorbent polyvinylamine@MIL-101 was recyclable and competitive in CO2 adsorption. Recently, selective removal of CO2 from offgas of various industries is very important, and metal–organic frameworks (MOFs) have been actively studied as a potential adsorbent. In this study, a typical MOF with a high porosity, MIL-101, was modified by loading (via ship in a bottle technique) basic polymer, polyvinylamine (PVAm), for the first time, in order to improve the performances of MIL-101 in adsorption/capture of CO2 from offgas. The obtained PVAm@MIL-101 showed highly increased selectivity (CO2/N2) and capacity in CO2 adsorption under low pressure, when suitable quantity of PVAm was introduced. Or, the adsorption selectivity and capacity of PVAm(0.7)@MIL-101 were around 11 and 2.5 times to those of pristine MIL-101, respectively at 298 K. Moreover, the PVAm(0.7)@MIL-101 was readily recycled for continuous uses and had optimum isosteric heat of adsorption (−ΔHads = 35–50 kJ/mol) for a wide range of CO2 adsorption. Therefore, loading PVAm into porous MOFs can be recommended as an attractive way to improve the performances of the MOFs in CO2 adsorption/capture from offgas under low pressure.