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Enhanced adsorption of thiophene with the GO-modified bimetallic organic framework Ni-MOF-199

Chen, Mingyan, Chen, Jie, Liu, Yucheng, Liu, Jie, Li, Lingli, Yang, Bing, Ma, Lili
Colloids and surfaces 2019
Fourier transform infrared spectroscopy, X-ray diffraction, absorbents, adsorption, coordination compounds, desulfurization, dynamic models, graphene oxide, ions, nickel, oils, scanning electron microscopy, sorption isotherms, synergism, thermal stability, thermogravimetry, thiophene
A new type of metal organic framework GO/Ni-MOF-199 was synthesized using the solvothermal method in combination with different amounts of graphene oxide (0%, 0.5%, 1.75% and 5%) in order to remove thiophene from model oil. The adsorption desulfurization performance was tested by removing thiophene from the n-octane/thiophene model oil. The thermal stability of composites is improved by modification. Adsorption capacity of MOF-199 was enhanced by doping Ni2+ and graphene oxide (GO) with appropriate content. Bimetallic ions combine with the oxygen-containing function of GO to form a stronger synergistic effect. The synthesized samples are characterized using XRD, SEM, FTIR, BET, and TGA methods. By using the appropriate characterization methods, it is shown that an excessive GO content will damage the structures of the composites. The investigation’s results demonstrated that the maximum adsorption capacity of 1.75% GO/Ni-MOF-199 reached 50.38 mgS/g MOF at 35℃, and a v (oil) /m (absorbent) ratio of 150 mL/g occurred after 3.5 h of adsorption. Furthermore, the 1.75% GO/Ni-MOF-199 composites could be reused at least four times. The pseudo-second-order dynamic model and Langmuir model are more suitable to represent how the GO/Ni-MOF-199 materials adsorb thiophene from the model oil.