Preparation and adsorption kinetics of resin adsorbent modified by amine for removing carbon disulfide
The carbon disulfide desulfurization adsorbent was prepared by anchoring active functional groups containing primary and secondary amines onto the resin chain through substitution reaction using chloromethylpolystyrene resin as the carrier and diethylenetriamine as the aminating agent,and the modified resin adsorbent was characterized by FTIR,element analysis,and BET.Subsequently,the adsorption performance of the adsorbent for removing CS2 from benzene was evaluated,and the adsorption breakthrough curves were obtained at different temperatures and initial concentrations of CS2.Langmuir and Freundlich models were used to analyze the adsorption isotherms of CS2 in benzene,and quasi first and quasi second order kinetic models,as well as particle diffusion models,were used to fit the adsorption kinetics.The results showed that the amine modified polystyrene resin had excellent selective adsorption performance for carbon disulfide,with a penetration adsorption capacity of up to 154.17mg/g at the adsorption condition of air-pressure,318.15K,1h-1,2000mg/L CS2 in benzene.In addition,the adsorption of CS2 by the adsorbent conforms to Langmuir model and the quasi second order kinetic model,and the adsorption control step was the reaction between CS2 and the surface active amino group of the adsorbent,rather than the mass transfer process.By establishing a Y-N dynamic adsorption model for the adsorption process and verifying the adsorption breakthrough curve,the fitted values were in good agreement with the experimental values.
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