External Mass Transfer Studies during the Adsorptions of Some Dyestuffs and p-Nitrophenol onto Chitosan from Aqueous Solution

Authors : İlhan UZUN, Fuat GÜZEL

Pages : 731-740

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The effect of temperature on the adsorptions of some dyestuffs [orange II insert ignore into journalissuearticles values(O-II);, crystal violet insert ignore into journalissuearticles values(CV); and reactive blue 5 insert ignore into journalissuearticles values(RB5);] and an ideal adsorbate p-nitrophenol insert ignore into journalissuearticles values(PNP); by chitosan insert ignore into journalissuearticles values(Sigma C 3646); from aqueous solution was investigated. The experimental data related to adsorption isotherms were applied to linear forms of the equations that they fitted, and isotherm constants were calculated. Since the isotherm curves obtained for the adsorptions of O-II and CV by chitosan fitted the Langmuir adsorption isotherm, the Langmuir constants insert ignore into journalissuearticles values(qm and b); related to the adsorption isotherms of these dyestuffs together with their kinetical data at different temperatures were applied to the equation of McKay et al., and external mass transfer coefficients insert ignore into journalissuearticles values(kf);1 at these temperatures were calculated. In addition, kinetic data obtained for each dyestuff and PNP at different temperatures were applied to a further equation developed by Weber-Mathews, and insert ignore into journalissuearticles values(kf);2 constants at these temperatures were calculated.
Keywords : Chitosan, Dyestuff adsorption, External mass transfer coefficient