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Issue 21, 2016
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Structure design of a hyperbranched polyamine adsorbent for CO2 adsorption

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Abstract

An amino-terminated hyperbranched polymer (HBP-NH2) has been prepared through the Michael addition reaction between amines and methyl acrylate (MA) at 0 °C, followed by self-condensation of the addition reaction products at 100 °C and 140 °C. A novel CO2-“imprinted” hyperbranched polymeric adsorbent (IHBPA) with a high amino density was conveniently prepared by using glutaraldehyde to crosslink HBP-NH2 which had pre-adsorbed CO2. Through comparing the adsorption capacities of the IHBPA with HBPA, which was prepared with a similar procedure to that of IHBPA but without CO2 pre-adsorption, it could be found that the pre-adsorbed CO2 on HBP-NH2 would occupy the reactive sites of amino groups, and play the role of “imprinting” in the preparation of the adsorbent. The adsorption capacity of the IHBPA could thus be improved. After reducing the imino groups of the IHBPA to alkyl amine by NaBH4, the adsorption capacity of the reducing solid amine adsorbent (IHBPA-R) can be further improved. The prepared solid amine adsorbents also showed promising regeneration performance, which could maintain almost the same adsorption capacity for CO2 after 10 adsorption and desorption recycles. The high CO2 adsorption capacity (7.65 mmol g−1) of IHBPA-R can be attributed to its high amino density, terminal amine and hyper-branched structures.

Graphical abstract: Structure design of a hyperbranched polyamine adsorbent for CO2 adsorption

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Publication details

The article was received on 24 May 2016, accepted on 11 Aug 2016 and first published on 12 Aug 2016


Article type: Paper
DOI: 10.1039/C6GC01416J
Citation: Green Chem., 2016,18, 5859-5869
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    Structure design of a hyperbranched polyamine adsorbent for CO2 adsorption

    H. He, L. Zhuang, S. Chen, H. Liu and Q. Li, Green Chem., 2016, 18, 5859
    DOI: 10.1039/C6GC01416J

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