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％.
Synthesis of ZIF-8@GO composites and its adsorption properties to CO2
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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