每周分享：《Journal of the American Chemical Society》上发表的文章

       今天给大家分享的是2014年3月份《Journal of the American Chemical Society》上发表的一篇名为：CO₂ Adsorption on Polyethylenimine-Functionalized SBA-15 Mesoporous Silica: Isotherms and Modeling。

文章摘要如下：

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.

该文章中材料表征采用的是美国麦克仪器ASAP 2020，使用该仪器获得材料-196°C氮气吸附脱附等温线。

详情可参考下面链接：

http://pubs.acs.org/doi/abs/10.1021/je401075p