通过添加羧基化石墨烯(GOC)、羟基化石墨烯(GOH)两种功能碳材料,改善MIL-101的吸附性能。对复合材料进行XRD、N₂吸脱附、FTIR、SEM等表征及静态、动态吸附性能测试。结果表明,GOC、GOH的添加可以改善MIL-101的比表面积、孔容,提高对苯的吸附量,同时抑制对水的吸附,其中MIL-101-GOH₁₀表现出最高的苯吸附量,可达1 336.09 mg/g。对低压条件下的测试结果进行动力学拟合,准二级动力学更能反映苯在复合材料上的吸附过程,说明吸附过程以化学吸附为主。石墨烯的复合可极大提升MIL-101的低浓度苯捕获能力,提升程度与添加量密切相关。

The adsorption properties of MIL-101 are improved by adding two different functional carbon materials,such as graphene carboxylate (GOC) and graphene hydroxylate (GOH).The prepared composite materials are characterized by XRD,N₂ adsorption-desorption,FT-IR,SEM,and their static and dynamic adsorption properties are tested.It is shown from results that the addition of GOC or GOH increases the specific surface area and pore volume of MIL-101,which improves its adsorption capacity to benzene and inhibits its adsorption capacity to water.MIL-101-GOH10 exhibits the highest adsorption capacity to benzene,as high as 1 336.09 mg·g^-1.It is found that the pseudo-second order kinetics can better reflect the adsorption process of the composites to benzene through fitting the test results under low pressure,indicating that the adsorption principle mainly bases on chemical adsorption.The combination of graphene can greatly improve the capture ability of MIL-101 to low concentration benzene,and the degree of improvement is closely related to the addition amount of graphene.

潘婷婷(1997-),女,硕士生,研究方向为气体吸附分离,ptt2649220600@163.com