title: Simulation of dye adsorption by beech sawdust as affected by pH.
abstract: The effect of pH on the batch kinetics of methylene blue adsorption on beech sawdust was simulated, in order to evaluate sawdust potential use as low cost adsorbent for wastewater dye removal. The zero point of charge pH(pzc) of the sawdust, in order to explain the effect of pH in terms of pH(pzc), was measured by the mass titration and the automatic titration methods. The adsorption capacity, estimated according to Freundlich's model, indicate that increase of the pH enhances the adsorption behaviour of the examined material. The lower adsorption of methylene blue at acidic pH is due to the presence of excess H(+) ions that compete with the dye cation for adsorption sites. As the pH of the system increases, the number of positively charged sites decreases while the number of the negatively charged sites increases. The negatively charged sites favour the adsorption of dye cation due to electrostatic attraction. The increase in initial pH from 8.0 to 11.5 increases the amount of dye adsorbed.
authors.affiliation: Laboratory of Simulation of Industrial Processes, Department of Industrial Management and Technology, University of Piraeus, 80 Karaoli & Dimitriou, GR 18534 Piraeus, Greece.
authors.forename: F A
authors.initials: FA
authors.lastname: Batzias
authors.forename: D K
authors.initials: DK
authors.lastname: Sidiras
mesh_terms: D000327:Adsorption; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification*; D003198:Computer Simulation; D004391:Dust; D029964:Fagus; D006863:Hydrogen-Ion Concentration; D008751:Methylene Blue / Q000737:chemistry / Q000302:isolation & purification*; D008956:Models, Chemical; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods; D014934:Wood
chemical_list: D004396:Coloring Agents; D004391:Dust; D014874:Water Pollutants, Chemical; D008751:Methylene Blue