Synthesis and characterization of UiO-66-NH2 incorporated graphene aerogel composites and their utilization for absorption of organic liquids
Synthesis and characterization of UiO-66-NH2 incorporated graphene aerogel composites and their utilization for absorption of organic liquids
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DOI：
10.1016/j.carbon.2022.09.015
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发表时间：
2022-09-26
期刊：
影响因子：
10.9
通讯作者：
Maboudian, Roya
中科院分区：
文献类型：
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作者：
Li, Zhou;Liu, Chen;Maboudian, Roya
本工作详细介绍了负载UIO-66-NH_2金属有机骨架(MOF)的石墨烯气凝胶(GA)的合成、材料表征和吸附性能。通过调整前驱体MOF/氧化石墨烯(GO)的质量比以及随后的临界点干燥，合成了一系列密度可调的MOF/GA复合材料，x范围为0~100，表示MOF/GO在起始溶液中的质量百分比。扫描电子显微镜(SEM)图像和Barrett-Joyner-Halenda(BJH)孔径计算表明，MOF的负载量增大了GA骨架的大孔(>；50 nm)结构，但对GA的介孔(2-50 nm)结构没有影响。MOF的负载度先减小后增大，在10-30%的样品中表现出最小值。关于MOF加载的这种行为以前没有报道过。进一步研究了MOF-x%/GA样品对不同有机液体的吸附能力。结果表明，MOF-30%/GA对各种溶剂的吸附效果最好，对氯仿的吸附容量最大，为147.0+/-10.0 mg/mg。这一行为归因于MOF掺入引起的结构变化以及有机分子与MOF之间的相互作用。
This work details the synthesis, materials characterization and absorption capacity of graphene aerogel (GA) loaded with UiO-66-NH2 metal organic framework (MOF). A series of density-tunable MOF/GA composites were synthesized by adjusting the MOF/graphene oxide (GO) mass ratio of the precursors before hydrothermal reduction and subsequent critical point drying to achieve MOF-x%/GA composites, with x, ranging from 0 to 100, denoting the weight percent ratio of MOF to GO in the starting solution. Scanning electron microscopy (SEM) images and Barrett-Joyner-Halenda (BJH) pore size calculations supported that MOF loading enlarged the macroporous (>50 nm) structure of the GA framework but had no influence on the mesoporous (2-50 nm) structure of GA. The degree of MOF loading first decreased and then increased the density of resulting com-posites, exhibiting a minimum for the 10-30% samples. Such behavior with respect to MOF loading has not been reported previously. MOF-x%/GA samples were further investigated for absorption capacity using various organic liquids. MOF-30%/GA proved to be the best absorbent sample for all solvents tested, achieving the highest capacity for chloroform at 147.0 +/- 10.0 mg/mg. The behavior is attributed to the structural changes induced by the MOF incorporation as well as the interactions between the organic molecules and the MOF.