磁性ZIF-8/石墨烯气凝胶制备及油水分离性能

Preparation of Magnetic ZIF-8/Graphene Aerogel for Oil-Water Separation

为解决溢油和有机污染物问题,以NiFe_(2)O_(4)为磁性载体、氧化石墨烯(GO)为气凝胶框架、ZIF-8为金属有机材料,通过化学还原法制备了一系列不同复合比的磁性ZIF-8/石墨烯气凝胶(GA/NiFe_(2)O_(4)/ZIF-8),探究了其对乙醇、正己烷、油酸、花生油、真空泵油5种有机溶剂的吸附性能。结果表明,该复合气凝胶具有高效的吸附分离能力(吸附能力是其自身质量的20.0~46.6倍),且均高于对照试验组的石墨烯气凝胶(GA)和磁性石墨烯气凝胶(GA/NiFe_(2)O_(4))。进一步以正己烷为目标污染物进行循环试验,经过5次循环实验后,其吸附量降低不明显,降低幅度为1%~6%。此外,以真空泵油为目标污染物,考察了-60~140℃范围内复合气凝胶的高效吸附稳定性。这些优异性质的GA/NiFe_(2)O_(4)/ZIF-8复合气凝胶的开发有望为含油污水的油水分离处理提供借鉴。

To solve the problems of address oil spillage and organic pollutant,a series of magnetic ZIF-8/graphene aerogels(GA/NiFe_(2)O_(4)/ZIF-8)with different composite ratios were prepared by chemical reduction method.The composite aerogels were obtained by using NiFe_(2)O_(4) as magnetic carrier,graphene(GO)as aerogel framework,and ZIF-8 as metal-organic material.The adsorptions of GA/NiFe_(2)O_(4)/ZIF-8 for ethanol,n-hexane,oleic acid,peanut oil and vacuum pump oil were investigated.The results show that the composite aerogels have high adsorption capacity(up to 20.0~46.6 times of their own mass).Compared with the control group,the adsorption capacities of composite aerogels for five types of organic solvents and oil are greater than that of pure graphene aerogel(GA)and magnetic graphene aerogel(GA/NiFe_(2)O_(4)).The cycle regeneration experiments of the obtained aerogels with different composite ratios were further carried out with n-hexane as target contaminant.After five cycles,the decreases of adsorption amount are not obvious,and the decreases are 1%~6%.Moreover,the efficient adsorption stability of GA/NiFe_(2)O_(4)/ZIF-8 at-60~140℃was investigated by using vacuum pump oil as target contaminant.The excellent properties of GA/NiFe_(2)O_(4)/ZIF-8 are expected to provide reference for oil-water separation.