Fabrication of adsorbents with enhanced CuⅠ stability: Creating a superhydrophobic microenvironment through grafting octadecylamine

作者：Zida Ma; Yuxia Li; Mengmeng Jin; Xiaoqin Liu; Linbing Sun^*

来源：Chinese Journal of Chemical Engineering, 2023, 55(03): 41-48.

In atmospheric conditions, CuⅠ is easily oxidized to CuⅡ due to the coexistence of moisture and oxygen.The poor oxidation inhibition of CuⅠ restricts the practical application of CuⅠ -containing materials.Herein we introduce an approach to construct a superhydrophobic microenvironment in CuⅠ functionalized metal–organic frameworks by coordinatedly grafting organic amine compounds onto open metal sites(OMSs), which can hinder the accessibility of moisture to pores thereby enhancing the stability of CuⅠ . As a proof of concept, MIL-101(Cr) with abundant OMSs and octadecylamine(OA)with long hydrophobic alkyl groups are used as carrier and surface coating. As superhydrophobic porous materials, the resultant CuⅠ M-OA exhibits improved CuⅠ stability in addition to retaining high crystallinity and intact porosity while almost all CuⅠ is oxidized in hydrophilic CuⅠ M upon exposure in a humid atmosphere for 30 h. CuⅠM-OA owns excellent adsorption desulfurization performance(ADS) with regard to thiophene, benzothiophene, and 4,6-dimethyl dibenzothiophene. Even from hydrated fuel, the adsorption performance of CuⅠM-OA maintains well while the adsorption capacity of CuⅠM decreases to 7% after4 cycles. The remarkable moisture resistance, CuⅠ stability, and high porosity make the current adsorbent CuⅠM-OA highly promising for the practical ADS process.

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  材料化学工程国家重点实验室