Document Type: Research Article
Department of Chemistry, institute of exact sciences, University Center Ahmed Zabana of Relizane. Algeria
Superior School of Applied Sciences of Tlemcen, Bel Horizon, Tlemcen, Algeria
Laboratory for the Application of Organic Electrolytes and Polyelectrolytes (LAEPO), Department of Chemistry, Faculty of Science, University of Tlemcen, Algeria
In this article efficiency of activated carbon as a potent adsorbent of cationic dyes dyes present in waste water was studied in this research. Activated carbon (AC) from starch was used to adsorb methylene blue (MB) from an aqueous solution. Various parameters such as adsorbent concentration, temperature, initial dye concentration, contact time, and pH were investigated and the optimum parameters were determined based on the experimental outcomes. The extent of methylene blue removal increased with the increased in contact time, adsorbent mass, solution pH and amount of adsorbent used. Thermodynamic parameters like the Gibbs free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°) were also determined and they showed that the adsorption process was feasible, spontaneous, and exothermic in the temperature range of 293–333 K. The experimental equilibrium data were analyzed using the isotherms of Langmuir, Freundlich, and Tempkin. Two simplified kinetic models including pseudo-first-order and pseudo-second-order equation were selected to follow the adsorption processes.