ENIVRONMENT ASIA

Volume 12, No. 01, Month JANUARY, Year 2019, Pages 127 - 142

Adsorption of organic dyes onto commercial activated carbon by using non-linear regression method

Hadjer Zeghache, Said Hafsi, and Noureddine Gherraf

Abstract Download PDF

The present paper intends to appraise the influencing operative variable on the adsorption efficiency of two organic dyes namely Erythrosine and Brilliant green on activated carbon in aqueous solution. The experimental data at equilibrium were studied through the non-linear regression of Langmuir, Freundlich and Liu isotherm models. Collected data and obtained results seems to fit well with the Liu model for both dyes with R²adj values closer to one and lower values of SD. The kinetic behaviors of solute adsorption were respectively employed by using different existing models, Pseudo-first, Pseudo-second order, General order, Avrami and Elovich equation. Findings results showed that General order had more conformity compared with the others, for Brilliant green with R²adj =0.9949 and Avrami kinetic model for Erythrosine with R²adj = 0.9956. According to the calculated thermodynamic parameters the adsorption process of the Erythrosine dye is endothermic and spontaneous process in nature (ΔH0=41.428-41.459KJ/mol) and nonspontaneous for the Brilliant green dye (ΔH0=80.409-54.955KJ/mol) over the studied temperatures (293K-303K).

Keywords

Erythrosine; Brilliant green; Activated carbon; Isotherm; kinetic; Non-linear regression.

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