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CO2 adsorption behavior of amine-functionalized ZIF-8, graphene oxide, and ZIF-8/graphene oxide composites under dry and wet conditions
Microporous and Mesoporous Materials ( IF 5.2 ) Pub Date : 2018-03-13 , DOI: 10.1016/j.micromeso.2018.03.012
Jeewan Pokhrel , Nidhika Bhoria , Stavroula Anastasiou , Theodoros Tsoufis , Dimitrios Gournis , George Romanos , Georgios N. Karanikolos

Development and optimization of solid adsorbents is highly sought after toward establishment of energy-efficient and high-throughput CO2 capture processes in industry. Herein, graphene oxide (GO), zeolitic imidazolate framework ZIF-8, and composite ZIF-8/GO adsorbents were developed and further functionalized using various amine functionalities, namely, 3-aminopropyl-triethoxysilane (APTES), polyethyleneimine (PEI), and ethylene diamine (ED). Following structural and morphological evaluation, the resulting adsorbents were tested and compared for CO2 adsorption capacity and kinetics, while their performance under the presence of pre-adsorbed water was evaluated as well. GO functionalization by APTES resulted in a 36% increase in adsorption capacity at 1 bar and 30 °C compared to unmodified GO, and a further 33% increase under the presence of pre-adsorbed water (10% RH) compared to the corresponding APTES-GO capacity under dry conditions. Amine functionalization of ZIF-8 resulted in a capacity increase of up to 43% at 1 bar compared to unmodified ZIF-8, while ZIF-8/GO post-functionalization in water enhanced the capacity of this type of composite adsorbent compared to non-functionalized ZIF-8/GO and the pure ZIF-8 particularly at lower pressures. The reported results can be valuable towards devising optimum paths of functionalization and performance enhancement of these types of adsorbents that can pave the way toward design of highly efficient materials and processes for the current and future CO2 capture needs.



中文翻译:

胺官能化ZIF-8,氧化石墨烯和ZIF-8 /氧化石墨烯复合材料在干湿条件下的CO 2吸附行为

在建立工业上高能效和高通量的CO 2捕集工艺之后,强烈要求开发和优化固体吸附剂。本文中,开发了氧化石墨烯(GO),沸石咪唑酸酯骨架ZIF-8和复合ZIF-8 / GO吸附剂,并使用各种胺官能团(即3-氨丙基-三乙氧基硅烷(APTES),聚乙烯亚胺(PEI)和乙二胺(ED)。在进行结构和形态评估之后,测试了所得吸附剂并比较了其CO 2含量还评估了它们的吸附能力和动力学,同时还评估了它们在存在预吸附水的情况下的性能。与未改性的GO相比,APTES进行的GO功能化使1 bar和30°C的吸附能力提高了36%,与相应的APTES相比,在存在预吸附水(相对湿度10%)的情况下,吸附能力进一步提高了33%。干燥条件下的GO容量。与未改性的ZIF-8相比,ZIF-8的胺功能化在1 bar下的容量提高了43%,而水中的ZIF-8 / GO后功能化与非改性的ZIF-8相比提高了这类复合吸附剂的容量。功能化的ZIF-8 / GO和纯ZIF-8,尤其是在较低压力下。2捕获需求。

更新日期:2018-03-13
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