Synthesis of ZIF-8@GO composites and its adsorption properties to CO2
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化石燃料燃烧排放的CO2造成温室效应日趋严重,开发具有对CO2高吸附性能的吸附剂至关重要.而金属-有机框架材料(MOFs)和氧化石墨烯(GO)作为新型吸附剂,仍存在对CO2吸附性能低的问题.采用溶剂热法制备ZIF-8@GO材料,利用XRD、SEM、BET等表征手段,研究了 ZIF-8@GO材料的微观结构及其对CO2吸附性能.研究表明:ZIF-8@GO保持了 ZIF-8的晶型结构,GO主要对ZIF-8起到尺寸调控和结构导向作用.气体吸附分离测试表明,ZIF-8@GO材料与ZIF-8材料相同,均是以微孔占据孔隙主导地位的材料;当GO参与复合比例为8％时,ZIF-8@GO(8％)材料的 BET 和 Langmuir 比表面积分别为 1 037.18、1 115.90 m2/g,对 CO2 吸附量为 34.347 cm3/g,较母体ZIF-8材料对CO2吸附量提高了 32.3％.
The greenhouse effect caused by CO2 emissions from fossil fuel combustion is becoming more and more serious,it is urgent to develop adsorbents with CO2 adsorption properties.As new adsorbents,metal-organic frame materials(MOFs)and graphene oxide(GO)have the problem of low CO2 adsorption performance.ZIF-8@GO was prepared by solvothermal method,and the microstructure and adsorption properties of ZIF-8@GO to CO2 were studied by XRD,SEM and BET.The results showed that ZIF-8@GO maintains the crystal structure of ZIF-8,and GO mainly plays a role in size regulation and structure orientation of ZIF-8.The gas adsorption separation test showed that ZIF-8@GO is the same as ZIF-8,which is dominated by micropores.Notably,when the GO participation ratio is 8％,the BET and Lang-muir specific surface areas of ZIF-8@GO(8％)materials are 1 037.18,1 115.90 m2/g,respectively,and the adsorption capacity to CO2 is 34.347 cm3/g.Compared with the parent ZIF-8 material,the CO2 adsorption capacity is increased by 32.3％.
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