Preparation and adsorption properties of waste polyester-based activated carbon activated by ZnCl2
In order to realize the resource utilization of waste polyester fabrics,waste polyester-based activated carbon(WPT-AC)was prepared by ZnCl2 activation-high temperature pyrolysis method.The crystal phase,characteristic groups and specific surface area pore structure of WPT-AC were characterized by XRD,FT-IR and BET.The optimal process for preparing WPT-AC was determined by orthogonal experiment.The adsorption performance of WPT-AC for methylene blue(MB)was evaluated and the adsorption mechanism was analyzed.The results showed that the specific surface area of WPT-AC prepared under the optimal process conditions of 45% ZnCl2 solution,pyrolysis temperature of 900℃,heating rate of 5℃/min and pyrolysis time of 90 min was as high as 1 089.72 m2/g,and the yield was 58.45% .The abundant pore structure was beneficial to improve the adsorption of pollutants.The removal rate of MB by WPT-AC was 97.49% under the condi-tions of WPT-AC dosage of 2.0 g/L,initial concentration of MB of 500 mg/L,adsorption temperature of 40℃and adsorp-tion time of 80 min.WPT-AC also had a good adsorption effect on oxytetracycline(CIP),and the presence of electrostatic at-traction was beneficial to the improvement of adsorption performance under the condition of Ni(Ⅱ)coexistence.The quasi-second-order kinetic model and Langmuir isothermal adsorption model of WPT-AC were more suitable for fitting the MB ad-sorption process of WPT-AC.
waste polyester-based activated carbonadsorptionmethylene bluezinc chloride activationhigh temperature pyrolysis
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