Adsorption Nature of Tartrazine Dye onto Synthesized Melamine-Formaldehyde-Tartaric Acid (MF-T) Resin (Kinetic, Isotherm and Thermodynamic Studies)

Document Type : Original Article

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Egyptian Armed Forces, Egypt.

Abstract

The Melamine-Formaldehyde-Tartaric acid (MF-T) porous polymeric resin was synthesized in this work and examined as adsorbent for organic pollutants. Adsorption rate and isotherm of tartarzine, as an organic pollutant, onto MF-T from a synthetic wastewater was studied applying batch method. Initial concentration, contact time and temperature were considered as the variables of the adsorption experiments. Linear forms of pseudo-first and pseudo-second order kinetic models were applied using experimental adsorption-rate data. More than 60% of tartrazine was removed in the first 10 minutes and pseudo second-order model was found to well represent the adsorption kinetics with average capacity of about 23 mg/g over the studied temperature span. Linear forms of Langmuir and Freundlich isotherm models were applied using experimental adsorption-equilibrium data. In general, Freundlich model is selected to represent the adsorption isotherm. It was found that adsorption mechanism is temperature sensitive but retain spontaneous over the studied temperature span. Thermodynamic study revealed that physical mechanism contributes at low temperature range (15-30oC) and a dual mechanism of physical and chemical natures is postulated at the higher temperature range (30-45oC). The chemical part is suggested to be endothermic amide bonding of tartrazine with resin reactive functional groups.

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