Adsorptive eradication of tartrazine from aqueous solutions onto doped polyaniline

Smita Jadhav, Dipika Jaspal

Abstract


A potential polymeric adsorbent, doped polyaniline (PANI) has been investigated to eradicate of hazardous dye tartrazine, from textile effluent. During the adsorption process, the influence of the acidic character of the adsorbate, pH, dose of the adsorbent, dye concentration and time of contact between the adsorbent and adsorbate has been evaluated. The outcomes attained from batch experiments have been applied to Langmuir and Freundlich isothermal models. Different error analysis techniques like mean square error, root mean square error, Chi-square test (χ2), sum of absolute errors and sum of squared errors have been determined for the doped polyaniline- tartrazine system. Langmuir isotherm has been established as the best fit isothermal model, with minimum errors and high regression values. About 90-97 % removal was achieved in the first 70 min. A positive enthalpy value implied the adsorption process to be endothermic. The energy of activation for the dye adsorbent system was found to be 28.9 kJ mol-1 which was in line with physisorption.


Keywords


adsorption; doped polyaniline; endothermic; entropy; error analysis; tartrazine

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DOI: https://doi.org/10.2298/JSC190705116J

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