ADSORPTION OF BASIC MAGENTA DYE FROM AQUEOUS SOLUTION USING RAW AND ACID MODIFIED YAM PEEL AS ADSORBENT

Abstract

Adsorption of basic magenta (BM) dye from aqueous solution by using raw and acid modified yam peel waste were studied using batch adsorption methods. The adsorbents were characterised using scanning electron microscopy (SEM) and Fourier transform Infrared (FTIR) spectroscopy analysis. The effect of contact time (5-120 minutes), initial dye concentration (20 - 120 mg/L), adsorbent dosage (0.2 - 1.0g), temperature (303 – 323 k) and pH (2 - 10) were investigated. Maximum dye adsorption occurred at 120 mg/L for raw yam peel and 100 mg/L for modified yam peel. Equilibrium data were analysed through thermodynamic, kinetic and isotherms modelling. Thermodynamic study revealed a negative value of  and positive values of  and  indicating spontaneous and endothermic nature of the adsorption process. The kinetic study revealed that the adsorption was best fitted to pseudo-second order model. The adsorption data for the adsorbate was best described by Langmuir and Freundlich adsorption isotherm for raw and modified yam peel