Preparation Of Molecularly Imprinted Functionalized Cu-MOF/GO Adsorbent And Study On Desulfurization Performance

For the thiophene-containing sulfur compounds in fuel oil,due to its own steric hindrance effect and structural stability,the traditional desulfurization technology is difficult to remove and easily damage the thiophene sulfide with drug value.Form a waste of resources.Molecular Imprint Desulfurization As a novel desulfurization method,by preparing a molecularly imprinted polymer of thiophene sulfide,the corresponding sulfur-containing organic matter in the oil can be quickly and efficiently removed without degrading its quality.In this paper,three imprinted desulfurization adsorbents were prepared by surface molecular imprinting technique using Cu-MOF,GO and Cu-MOF/GO composites.The specific research results are as follows:The surface molecularly imprinted adsorbent Cu-MOF@SMIP was prepared by using Cu-MOF as the matrix,dibenzothiophene(DBT)as the template molecule and methacrylic acid(MAA)as the functional monomer.The structure and morphology were characterized by SEM,BET and FT-IR.At 25?,adsorption equilibrium time of Cu-MOF@SMIP for DBT in simulated oil samples was 1.5h,and the adsorption amount was 130.73mg/g,which was much higher than that of Cu-MOF,and compared with Cu-MOF@NIP adsorption.The quantity advantage is obvious,and the imprint factor fimp is 2.29.Adsorption behavior takes a pseudo first-order kinetic model.In the presence of interfering substances benzothiophene(BT)and biphenyl,the target molecule DBT showed higher affinity,and the relative selection coefficients reached 2.55 and 2.14,respectively.Using GO as the matrix,DBT and BT are template molecules,MAA is the functional monomer,and EDMA is the cross-linking agent.The bimolecular imprinted desulfurization adsorbent GO@D-SMIP is prepared by SEM,TG,FT-IR,etc.It performs structural and topographical characterization.The adsorption capacity of GO@D-SMIP to DBT and BT at25°C was 101.31 and 90.33mg/g adsorption equilibrium time of 1.2 h.The adsorption kinetics fits the pseudo-first pseudo-order model,and the adsorption isothermal fitting conforms to the Freundlich isotherm equation.DBT and BT showed stronger recognition ability and affinity.The relative selection coefficients of DBT and BT for interfering substances and biphenyl reached 2.14 and 2.15,respectively.And the adsorbent GO@D-SMIP has 6 times of adsorption-desorption,and its specific memory and recognition ability remains almost unchanged.In the stage of synthesis of Cu-MOF,GO-MOF/GO composites were prepared by introducing GO,and then molecularly imprinted with DBT and BT as double template molecules to obtain Cu-MOF/GO@D-SMIP adsorbent.The structure and morphology were characterized by SEM,TG,FT-IR,XRD,BET and other techniques.The specific surface area of the adsorbent reached 981.09m~2/g.The adsorption capacities of Cu-MOF/GO@D-SMIP to DBT and BT were 162.85 and 148.37mg/g,respectively,at an adsorption equilibrium time of150 min at 25°C.The adsorption process satisfies the quasi-first-order kinetic equation.The adsorption isothermal fitting satisfies the Freundlich equation and conforms to the double-molecular imprinting design concept of multilayer adsorption.The relative selectivity coefficients of the adsorbents to DBT and BT were 1.99 and 2.15,respectively,in the presence of interfering substances and biphenyl.The adsorbent Cu-MOF/GO@D-SMIP has no obvious degradation after six adsorption-analytical adsorption capacities,and has the advantage of recycling.