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Zeolite properties improvement by chitosan modification—Sorption studies
Dorota Kołodynska,Paulina Hałas,Małgorzata Franus,Zbigniew Hubicki 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.52 No.-
In the paper the potential of chitosan modified zeolite (NaP1CS) as a cheap adsorbent for methylene blue(MB) removal from aqueous solutions was determined. Fourier transform infrared spectroscopy analyses,nitrogen adsorption/desorption isotherms and scanning electron microscope were applied tocharacterize the adsorbent. Batch adsorption studies were carried out to examine effects of variousfactors such as pH, contact time, initial MB and Cu(II) concentrations, temperature influence on thesorption process. The impact of different ways of zeolites modification with chitosan on sorption capacityand the comparison of adsorption of unmodified zeolite andfly ash are presented. The effect of differentmetal ions such as Cu(II), Zn(II), Mn(II), Fe(III) and also that of foreign ions on the MB sorption were alsostudied. The pseudo-first order, pseudo-second order and intraparticle diffusion models werefitted tothe kinetic data. The bestfit was achieved with both the pseudo-second order and intraparticle diffusionmodels. The experimental equilibrium data were evaluated by the Langmuir, Freundlich, Temkin andDubinin-Radushkevich isotherm models. The calculated thermodynamic parameters indicated aspontaneous and endothermic sorption process. Desorption studies were carried out with differentdesorbing agents. HCl proved to be the most effective desorption agent for MB and Cu(II).
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