Preparation Of Carbon Material Based On Used Cigarette Filters And Study Its Adsorption Properties

Carbon materials are widely used in the treatment of industrial wastewater due to their easy functional modification,high thermal and chemical stability,and good biocompatibility.In recent years,cellulose acetate in cigarette filters has been transformed into carbon materials with microporous structure due to pyrolysis,which has attracted the attention of researchers in industrial wastewater treatment and supercapacitor energy storage.In this paper,a porous cigarette material is prepared by using a used cigarette filter as a raw material,and is applied to the removal of dyes and heavy metals in wastewater.The used cigarette filter was heated in a 800℃,N2 atmosphere tube furnace to obtain pyrolytic carbon,and the surface of the pyrolytic carbon was chemically modified by adding nitric acid,potassium permanganate solution and potassium permanganate followed by ferric chloride solution.Nitric acid modified carbon,acidic potassium permanganate modified carbon(C/MnO2),acidic potassium permanganate and ferric chloride modified carbon(C/MnO2/Fe2O3)were obtained and characterized.Nitric acid modified carbon has a larger specific surface area and more void structure than pyrolytic carbon;The surface morphology of C/MnO2 is in the shape of a white fungus,and the pore size is larger than the molecular size of RhB,which can be used for adsorption and separation of RhB;C/MnO2/Fe2O3 has iron oxides,which have strong complexation force and can enhance the adsorption capacity of heavy metal Cr(VI).Pyrolytic carbon,nitric acid modified carbon,C/MnO2,C/MnO2/Fe2O3 have different adsorption effects on different dyes and heavy metals.The adsorption effect of nitric acid-modified carbon on MO is higher than that on pyrolytic carbon.Under pH=3,the dosage is 1 g/L,and the adsorption amount of MO can reach 498 mg/g under the condition of adsorption for 3 h;The adsorption effect of C/MnO2 on RhB is higher than that of nitric acid modified carbon.Under strong acidic conditions,the optimal dosage is 1 g/L,and the adsorption amount of RhB can be as high as 501 mg/g;The adsorption effect of C/MnO2/Fe2O3 on heavy metal Cr(Ⅵ)is higher than that of pyrolytic carbon,nitric acid modified carbon and C/MnO2.Under the condition of pH=5,the dosage of 1 g/L and adsorption for 5 h,the adsorption capacity of heavy metal Cr(VI)by C/MnO2/Fe2O3 can reach 28 mg/g.The adsorption of MO by nitric acid-modified carbon,the adsorption of C/MnO2 to RhB and the adsorption behavior of C/MnO2/Fe2O3 to Cr(Ⅵ)accord with the Langmuir model,and the adsorption is dominated by surface monolayer.Nitric acid-modified carbon adsorption MO,C/MnO2 adsorption RhB and C/MnO2/Fe2O3 adsorption Cr(Ⅵ)are in accordance with the quasi-second-order kinetic equation,and the adsorption type is mainly chemical adsorption.Under strong acidic conditions,C/MnO2 removes the dye by oxidation and adsorption.