AMINE-GRAFTED MESOPOROUS SILICA FOR CO2 CAPTURE

CUESTA ZAPATA PABLO M; SERRANO ROMINA; GONZO ELIO E; PARENTIS MÓNICA L; CUESTA ZAPATA PABLO M; SERRANO ROMINA; PARENTIS MÓNICA L; GONZO ELIO E

LATIN AMERICAN APPLIED RESEARCH

UNS Printing Office

Lugar: Bahía Blanca; Año: 2020 vol. 50 p. 167 - 173

0327-0793

Three-aminopropyltriethoxysilane modified MCM-41 mesoporous silicas were synthe-sized by grafting the organic groups on the support surface, using different molar ratios of SiO2: Ami-nosilane. The synthesized solids were characterized by N2 adsorption, XRD, FTIR and TG-DTA. MCM-41 has a specific surface area of about 1500 m2/g, while that of the functionalized materials falls around 600 m2/g, showing a tendency to decrease as the con-tent of the functionalizing agent grows. The N2 ad-sorption isotherms of pure and functionalized materi-als are characteristic of mesoporous type IV materi-als. The structural properties were studied by FTIR and XRD. TG-DTA studies allow analyzing the ther-mal stability of the materials and determining the de-posited amine content. The aminosilane modified mesoporous silica materials increase the CO2 adsorp-tion capacity compared to that of the pure support. Freundlich, Dual Sites Sips and Dubinin-Radush-kevich equation models, all explained data satisfacto-rily. Further analysis using Freundlich equation re-vealed that the model parameters showed linear cor-relation with APTES molar content in the samples.