三维氧化石墨烯/明胶海绵的制备与吸附性能研究

Preparation and adsorption property of 3DGO/gelatin sponge

三维石墨烯较之石墨烯拥有更加立体的结构,有效减少了石墨烯片层间的堆叠,易于和其他材料进行复合,可以更大限度地发挥石墨烯的优异性能。本课题以明胶为交联剂,制备了明胶交联的氧化石墨烯絮状悬浮液,采用冷冻干燥法除去水分后,制得三维氧化石墨烯/明胶海绵。通过扫描电子显微镜表征了不同氧化石墨烯浓度所制备的海绵的形貌特征,测试了三维氧化石墨烯/明胶海绵对石蜡的吸附性能,并采用二室一级动力学模型来描述三维氧化石墨烯/明胶海绵对石蜡的渗出过程。结果表明,海绵整体呈现明显的三维立体网状结构,当氧化石墨烯浓度为1.5mg/mL时,所制备的三维石墨烯/明胶海绵综合性能较佳,吸附量达到海绵质量的40倍以上;石蜡在快解吸和慢解吸阶段所需要的表观活化能分别为53.92kJ和-10.22kJ。

The three-dimensional(3 D)graphene has a more stereo structure than the graphene,which effectively reduces the stacking of the graphene sheets.It can exert the superior performance of the graphene to a greater extent through combining with other materials readily.A gelatin-crosslinked graphene oxide floc suspension was prepared using gelatin as a cross-linking agent,and a 3 Dgraphene oxide(GO)/gelatin sponge was prepared by freeze-drying to remove water.Then the morphology of sponges with different GO concentrations was characterized by scanning electron microscopy,and the adsorption properties of the sponges on paraffins were tested.In addition,a two-compartment firstorder kinetic model was used to describe the exudation process of the sponge.The results showed that the sponges presented a distinct 3 Dnetwork structure.When the concentration of GO was 1.5 mg/mL,the sponge prepared had optimal comprehensive performance,and the adsorption rate was more than 40 times the mass of sponge.The apparent activation energies required for the desorption stage of paraffin were 53.92 kJ and-10.22 kJ for fast desorption and slow desorption,respectively.