ZIF-67/CS,an environmentally friendly low-cost chitosan-based composite,is designed and prepared in order to solve the problem that traditional adsorbents are difficult to separate from water phase.The impacts of pollutant concentration,contact time,adsorbent dosage,pH and ionic strength on the adsorption performance of ZIF-67/CS adsorbent for malachite green pollutants are investigated.The structure,morphology and thermal stability of ZIF-67/CS adsorbent are characterized by means of XRD,SEM,FT-IR and TG.It is shown that in the adsorption experiment,the adsorption isotherm of malachite green by ZIF-67/CS at 303.15 K conforms to the Temkin isothermal adsorption model.It is indicated by the adsorption kinetic fitting results that the adsorption behavior of malachite green by ZIF-67/CS conforms to the pseudo second-order adsorption kinetic model.It is verified from adsorption thermodynamics results that the adsorption process is spontaneous and heat-absorbing.Therefore,the adsorption of malachite green by ZIF-67/CS is a complex chemical adsorption process,which is mainly determined by the speed.
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