Adsorption study of Fe (III) on modified adsorbent: adsorption isotherms and kinetics
Abstract
This work is dedicated to the adsorption of ferric (III) ions by maleic anhydride styrene copolymer (MASC) modified with 2-amino-4,6-disulphoacid. The influence of pH, time required for reaching of maximum adsorption capacity, ionic strength, and primary concentration of ferric (III) ions were studied during investigations. Results have shown that the maximum adsorption capacity of the sorbent with respect to ferric ions is 373.31 mg/g at pH=5. Equilibrium concentrations of ferric (III) ions in solution was set by using 2,2`-([1,1`-biphenyl]-4,4`-diilbis(diazen-2,1-diyl)bis(benzene-1,3,5-triol) C18H18O6N4 (R) as reagent. Absorbances of solutions were measured on KFK-2 with l=1 cm at λmax=490 nm. Beer`s law was obeyed in the range 0.056-0.12 mcg/g. Various adsorption isotherm and kinetic models have been studied. It was found that Langmuir model best explains the current adsorption process and pseudo-second order kinetic model best fits with results. The structure of adsorbent was studied by IR spectroscopy on Varian 3600 Fourier spectrometer in the region from 400 to 4000 cm-1. Results of investigation were compared the literature data.
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