Adsorption of Tartrazine onto Activated Carbon Based Cola Nuts Shells: Equilibrium, Kinetics, and Thermodynamics Studies

The uptake of tartrazine from its aqueous solution by powdered activated carbon prepared cola nut shells chemically with potassium hydroxide (ACK) and phosphoric acid (ACP) has been investigated using kinetics models. Batch isotherm data were analysed the pseudo-first order, pseudo-second order model as well intraparticle diffusion model. For structural elucidation, materials characterized FTIR, XRD SEM. These analyses revealed that carbons (ACK ACP) predominantly mesoporous several oxygen-containing functional groups dispersed on their surface. reaction was systematically under various experimental conditions such contact time, adsorbent dose pH. two adsorbents, quantity adsorbed 19.256 mg/g 18.196 respectively for ACP ACK at respective times 5 10 min obtained. adsorption tested Langmuir, Freundlich Langmuir found to best describe tartrate ions maximum monolayer capacities 24.57 21.59 ACK, respectively. Results analysis indicated clearly kinetic rate fitted therefore controlling mechanism both adsorbents. Thermodynamic studies process spontaneous exothermic increased randomness solid interface, then but non-spontaneous ACK. results show these could be an alternative more costly adsorbents purpose elimination.