Preparation Of Porous Sodium Alginate Hybrid Membrane And Study On Their Adsorption Of Sulfide In Gasoline

Gasoline and diesel oil have been the main fuel since the industrial revolution,which are widely used in industry and power industry.However,the sulphide has become the main source of sulfide in the air after chemical reaction,which is serious harmful to the environment and human health.In addition,excessive sulfur content in gasoline will cause catalyst poisoning,causing catalytic performance reduced or even lost.Therefore,the removal of sulfur compounds from gasoline has become an filed being intensely researched.Adsorption is one of the most promising treatment method with its low cost,easy operation,high efficiency,not reduce the octane number and other advantages.But the selection,preparation and adsorption capacity of adsorption material are limiting conditions for adsorption.Membrane adsorption method as a new way of desulfurization,has injected new vitality for desulfurization industry.A new organic/inorganic porous hybrid membrane was prepared by physical blending technology,and the adsorption behavior of the hybrid membrane for sulfides in gasoline was investigated systematically.The main researches are listed as follows:(1)MIL-101(Cr)and Si-MCM-41 were synthesized,and was characterized by scanning electron microscopy(SEM),fourier-transform infrared(FT-IR)spectroscopy,X-ray diffraction(XRD),specific surface area and pore size analysis(BET),thermogravimetric analysis(TG).(2)MIL-101(Cr)/alginate porous hybrid membrane was prepared by physical blending,and the membrane was charateried by scanning electron microscopy(SEM),fourier-transform infrared(FT-IR)spectroscopy,X-ray diffraction(XRD)and atomic force microscope(AFM)and the adsorption mechanism of the composites for thiophene was also studied.The experimental results show that the hybrid membrane exhibited an encouraging uptake capacity of 271 mg/g.Adsorption kinetic process could be described by the pseudo-second-order model.It was also found that the hybrid membrane showed excellent regeneration property.The results suggested that the hybrid membrane was a promisingadsorbent for removing thiophene from aqueous solution with high efficiency.(3)Si-MCM-41/alginate porous hybrid membrane was prepared by physical blending,and was crosslinked by glutaraldehydeusing hydrochloric acid as catalyst.The membrane was characterized by scanning electron microscopy(SEM),fourier-transform infrared(FT-IR)spectroscopy,X-ray diffraction(XRD)and atomic force microscope(AFM),and the adsorption properties of the membrane for dibenzothiophene was also studied.The effects of the parameters such as component ratio,contact time,concentration of dibenzothiophene,solution temperature and concentration of toluene on adsorbing ability of Si-MCM-41/alginate porous hybrid membrane were examined.The experimental results indicated that the hybrid membrane exhibited an encouraging uptake capacity of 350.7 mg/g.Adsorption kinetic process could be described by the pseudo-second-order model.(4)Si-MCM-41@Ag was prepared by impregnation method,and then Si-MCM-41@Ag alginate porous hybrid membrane was prepared by physical blending.The adsorption properties of the membrane for dibenzothiophene was also studied.The effects of the parameters such as contact time,concentration of dibenzothiophene,solution temperature and concentration of toluene on adsorbing ability of Si-MCM-41/alginate porous hybrid membrane were examined.The experimental results showed that the adsorption capacity of dibenzothiophene reached 380.1 mg/g,which increased by 30 mg/g compared with that of Si-MCM-41/ sodium alginate.Therefore,it is feasible to improve the adsorption efficiency of porous hybrid membrane by loading metal.