SBA-15 mesoporous silica was functionalized with polyethylenimine and was used as a substrate for CO2 adsorption. The synthesized material, denoted SBA-15-PEI, was characterized by means of X-ray diffraction, thermogravimetric analysis, and N2 adsorption/desorption at 77 K, in order to prove that polymer chains efficiently filled the pores of functionalized samples. CO2 adsorption isotherms on SBA-15-PEI were evaluated at T = (298, 313, 328, and 348) K for pressures up to 100 kPa by means of a volumetric technique. The experimental data showed a significant dependence of the CO2 adsorption capacity on temperature, with the highest capacity encountered at the highest temperature explored. Despite this unusual behavior, CO2 adsorption on SBA-15-PEI was satisfactorily modeled by means of the Sips isotherm. The modeling effort allowed to evaluate the isosteric heat of adsorption as a function of the fractional coverage of SBA-15-PEI. The comparison between the results obtained in the present work and those relative to CO2 adsorption on “benchmark” microporous substrates, such as 13X zeolite and Cu-BTC metal organic framework, allowed us to highlight significant analogies and differences with those other solids, giving interesting hints on the possible applications of SBA-15-PEI.

CO2 adsorption on polyethylenimine-functionalized SBA-15 mesoporous silica: Isotherms and modeling / Gargiulo, Nicola; Peluso, Antonio; Aprea, Paolo; Pepe, Francesco; Caputo, Domenico. - In: JOURNAL OF CHEMICAL AND ENGINEERING DATA. - ISSN 0021-9568. - 59:3(2014), pp. 896-902. [10.1021/je401075p]

CO2 adsorption on polyethylenimine-functionalized SBA-15 mesoporous silica: Isotherms and modeling

GARGIULO, NICOLA;PELUSO, ANTONIO;APREA, PAOLO;CAPUTO, DOMENICO
2014

Abstract

SBA-15 mesoporous silica was functionalized with polyethylenimine and was used as a substrate for CO2 adsorption. The synthesized material, denoted SBA-15-PEI, was characterized by means of X-ray diffraction, thermogravimetric analysis, and N2 adsorption/desorption at 77 K, in order to prove that polymer chains efficiently filled the pores of functionalized samples. CO2 adsorption isotherms on SBA-15-PEI were evaluated at T = (298, 313, 328, and 348) K for pressures up to 100 kPa by means of a volumetric technique. The experimental data showed a significant dependence of the CO2 adsorption capacity on temperature, with the highest capacity encountered at the highest temperature explored. Despite this unusual behavior, CO2 adsorption on SBA-15-PEI was satisfactorily modeled by means of the Sips isotherm. The modeling effort allowed to evaluate the isosteric heat of adsorption as a function of the fractional coverage of SBA-15-PEI. The comparison between the results obtained in the present work and those relative to CO2 adsorption on “benchmark” microporous substrates, such as 13X zeolite and Cu-BTC metal organic framework, allowed us to highlight significant analogies and differences with those other solids, giving interesting hints on the possible applications of SBA-15-PEI.
2014
CO2 adsorption on polyethylenimine-functionalized SBA-15 mesoporous silica: Isotherms and modeling / Gargiulo, Nicola; Peluso, Antonio; Aprea, Paolo; Pepe, Francesco; Caputo, Domenico. - In: JOURNAL OF CHEMICAL AND ENGINEERING DATA. - ISSN 0021-9568. - 59:3(2014), pp. 896-902. [10.1021/je401075p]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/625787
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