APPLICATION OF POLY-3 (METHYL THIOPHENE)-SAWDUST NANO COMPOSITE FOR REMOVAL OF ANIONIC CARMOISINE DYE FROM AQUEOUS SOLUTIONS

Abstract

In this study the adsorption behavior of sawdust (SD) coated with poly-3 (methyl thiophene) as a synthetic adsorbent (P3MTh/SD) for separation of carmoisine (an anionic dye) from water solutions was investigated. The morphology of sorbents was studied by scanning electron microscopy (SEM). Various experiments have been carried out using batch adsorption technique to study the effects of the main parameters such as contact time, initial dye concentration, pH, dye solution temperature on the adsorption process. The results showed that the adsorption attained to equilibrium in 60 min. Isotherm study conformed well to Freundlich equation and the monolayer sorption capacity obtained from the Langmuir model was 2.77 and 21.64 mg/g for SD and P3MTh/SD, respectively. The kinetic studies indicated that the adsorption of carmoisine on both sorbents follows pseudo-second order kinetic. From thermodynamic studies, it was observed that the adsorption was spontaneous and endothermic. P3MTh/SD was found to be very effective adsorbent in wastewater treatment for removal of carmoisine dye.