Characterizations and n-Hexane Vapor Adsorption of a Series of MOF/Alginates
2020
Li, Manlin | Huang, Weiqiu | Tang, Bo | Fang, Qianxi | Ling, Xiang | Lv, Aihua
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 (Cr³⁺ and Fe³⁺) contain micropores while those cross-linked by divalent cations (Zn²⁺ and Cu²⁺) 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.
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