Removal of Direct Red 81 Dye from Aqueous Solution by Native and Citric Acid Modified Bamboo Sawdust - Kinetic Study and Equilibrium Isotherm Analyses

Authors : İmran ALİ, Sarita DAHIYA, Tabrez KHAN

Pages : 59-87

View : 11 | Download : 5

Publication Date : 2012-01-24

Article Type : Conference Paper

Abstract :Adsorption of Direct Red 81 insert ignore into journalissuearticles values(DR81); dye was investigated using Bamboo Sawdust insert ignore into journalissuearticles values(BSD); and Treated Bamboo Sawdust insert ignore into journalissuearticles values(TBSD); in a batch system with respect to initial dye concentration, adsorbent dose, pH, temperature and contact time. Maximum adsorption capacity insert ignore into journalissuearticles values( q m ); obtained from the Langmuir isotherm plots were 6.43 mg/g insert ignore into journalissuearticles values(89%); insert ignore into journalissuearticles values(DR81-BSD); and 13.83 mg/g insert ignore into journalissuearticles values(92%); insert ignore into journalissuearticles values(DR81-TBSD); at 303 K. Freundlich and Halsey models described the data more appropriately as compared to Langmuir, Dubinin-Kaganer-Radushkevich insert ignore into journalissuearticles values(DKR);, Harkin-Jura and Temkin models. The adsorption dynamics conformed well to pseudo-second order kinetic equation. The adsorption process was controlled by both liquid-film and intra-particle diffusions. Thermodynamic parameters insert ignore into journalissuearticles values( Δ G o , Δ H o and Δ S o ); suggested the adsorption process to be spontaneous, endothermic with increase in randomness at solid-solution interface.
Keywords : Treated Bamboo Sawdust, adsorption, isotherm, kinetic, intra particle diffusion