Chromium is a pollutant metal element,and its content is an important index of water pollution control,among which Cr(Ⅵ)is the most toxic and easily absorbed by the human body.In this study,the adsorption and mass transfer separation of Cr(Ⅵ)in water was taken as the goal,and the porous carbon-doped Al2O3 adsorption material was prepared by calcination at 600℃ using aluminum-based MOFs synthesized by hydrothermal method with aluminum as metal source.The microstructure was characterized by modern analytical technology,and the adsorption capacity and mechanism were explored.The results showed that XRD,SEM,BET and other characterization methods proved the successful synthesis of NH2-MIL-53(Al)and porous carbon-doped Al2O3 structure.The precursor NH2-MIL-53(Al)and the calcined derivative porous carbon-doped Al2O3 are similar in morphology,and the specific surface area of porous carbon-doped Al2O3 material(180.24 m2·g-1)is larger than that of NH2-MIL-53(Al)(116.73 m2.g-1).The maximum equilibrium adsorption capacity of Cr(Ⅵ)on porous carbon-doped Al2O3 material is 671.56 mg·g-1.The fitting results of the adsorption kinetics model show that the adsorption behavior of porous carbon doped Al2O3 material for Cr(Ⅵ)is more consistent with the Langmuir isotherm model and pseudo-second-order kinetics model.The study shows that porous carbon-doped Al2O3 material can be used as a Cr removal material to achieve effective removal of Cr(Ⅵ).
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