Preparation of ZTIF based hydrophobic micro-mesoporous carbon and their adsorption and separation performance of 5-hydroxymethylfurfural
The stock solution of 5-hydroxymethylfurfural(5-HMF)that has undergone acidic catalytic conversion of biomass is composed of a low-concentration aqueous solution and multi-component acidic by-products levulinic acid(LA)and formic acid(FA).Therefore,the design of 5-HMF separation adsorbents requires hydrophobicity,acid resistance,and high selectivity.In this work,porous carbon with acid resistance,hydrophobicity and suitable micro-mesoporous distribution were obtained by controlling carbonization temperature and activation conditions using high N-content zeolitic tetrazolate-imidazolate frameworks(ZTIFs)as precursors,and the π-π interaction between porous carbon and 5-HMF can be used to achieve efficient enrichment and separation of 5-HMF in acid-containing aqueous solution.Three types of ZTIF-8 based porous carbon with different N-content and micro-mesoporous distribution were obtained by controlling carbonization temperature and activating alkali carbon ratio using ZTIF-8 as precursor.The relationship between the N-content and micro-mesoporous distribution of ZTIF-8 based porous carbon and the adsorption and separation performance of 5-HMF has been established.NCZTIF-8700C-800A2,with low N-content and abundant large micropores and small mesopores(12-30 Å),is an adsorbent for efficient enrichment and separation of 5-HMF from aqueous solutions containing acidic by-products.
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