Four different kinds of metal−organic framework (MOF) materials Zn-BTC, Cu-BTC, Cr-BTC, and Fe-BTC are incorporated into alginate, forming various hydrogels for n-hexane vapor adsorption. The cross-link networks between center cations of MOFs and alginate are verified by comparing the Fourier transform infrared characteristic peaks of the MOF/alginates with that of bare alginate. Interestingly, the MOF/alginate composites cross-linked by trivalent cations (Cr 3+ and Fe 3+ ) contain micropores while those cross-linked by divalent cations (Zn 2+ and Cu 2+ ) do not. The specific surface parameters of the as-prepared hydrogels are affected by the concentration of the alginate. In addition, the Fe-BTC/alginate performs the best n-hexane vapor adsorption capacity among the four kinds of composites. This study would be helpful for a better understanding of the effect of ionic cross-linking on the alginate hydrogel surface area parameters and provide basic knowledge and reference for expanding the applications of the MOF/ alginate hydrogels.
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.
The hydrophobic silica aerogels were prepared by the sol-gel method and the adsorption characteristics of their nitrogen adsorption at low temperature were analyzed. The static, dynamic and cyclic adsorption experiments of toluene vapor were carried out to study the adsorption properties of toluene vapor. The results show that the prepared silica aerogels are mesoporous adsorbents with a specific surface area of 732 m 2 •g -1 . The surface of the silica aerogel has a hydrophobic methyl group and the adsorption capacity is up to 1.6g•g -1 . The adsorption stability is strong. Dynamic adsorption temperature rises to 12 °C and the logistic model is use to fit the adsorption breakthrough curve with high similarity.
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