Adsorption of Azo-Anionic Dyes in a Solution Using Modified Coconut (Cocos nucifera) Mesocarp: Kinetic and Equilibrium Study

The effect of adsorbent dose and initial concentration on removing the azo-anionic dyes Congo Red andtartrazine present in a synthetic aqueous solution was studied using natural cellulose (CC) modified cationic (MCC) from coconut mesocarp. Three levels dosage (5, 8 12 mg/L) (40, 70 100 were used. Cetyl trimethyl ammonium chloride (CTAC) used as modifying agent. TGA DSC showed that extracted good quality, composed mostly with lignin hemicellulose traces, 8% moisture. FTIR spectrum effectiveness modification structure material symmetric deformation C6H6-Cl group 1472 cm?1 CTAC. It found decreasing increasing favored dyes’ adsorption capacity two bioadsorbents. Tartrazine removals 5.67 mg/g CC 19.61 MCC achieved, for CR 15.52 19.99 removal percentages over 97% quaternized biomass all cases. kinetic equilibrium study carried out to identify mechanisms involved process. Freundlich model can describe isotherm data tartrazine MCC. In contrast, those is defined by Langmuir Dubinin–Radushkevic models MCC, respectively Adsorption kinetics reached at 30 min, rapid minutes about contaminant first 5 min; fitting fitted Elovich (R2 = 0.756), 0.887) pseudo-second-order 0.999) models. Removing pseudo-first-order, > 0.98), when show R2 0.99