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This study aimed to investigation of Cd(II) ion removal from wastewater using chitosan-vanillin as sorbent I and chitosan-ortho-vanillin as sorbent II under various experimental conditions. The influence of pH, initial Cd(II) ion concentrations and isotherm studies, temperature and thermodynamic studies, adsorbent mass, adsorption time and kinetic studies on the sorption process have been studied using different experiments. The residual ion quantity is estimated through atomic absorption spectrometry. The maximum Cd(II) ion removal is obtained at pH 6 with highest uptake of ions after agitation for 2 hours. Langmuir isotherm model represented the most suitable for the experimental data and the maximum adsorbing capacity was 20.704 mg g-1 and 51.020 mg g-1 for sorbents I and II, respectively. Results of this study suggest that chemisorption is a step of rate-determining and the thermodynamic studies revealed that the nature of uptake sorption process is endothermic and spontaneous.

Estimation the Sorption Capacity of Chemically Modified Chitosan Toward Cadmium Ion in Wastewater Effluents