title: Removal of azo dyes from aqueous solutions using activated carbon as an adsorbent.
abstract: The potentiality of commercially available activated carbon has been investigated as an effective adsorbent to remove the dyes from aqueous solutions. The effects of pH of the solution, adsorbent dose, solute concentration and temperature on activated carbon for azo dyes such as acid orange 7 and direct red 31 have been evaluated. The percentage removal of the dyes has been found to be high at neutral pH. The dynamics of adsorption has been studied at different temperatures. The adsorption data follow Langmuir model as well as Freundlich model in the case of acid orange 7 whereas the data for direct red 31 fit into only Langmuir model.
authors.affiliation: Department of Chemistry,Sathyabama Institute of Science and Technology, Deemed University, Chennai 600 119, India.
authors.forename: A Nageswara
authors.initials: AN
authors.lastname: Rao
authors.forename: S
authors.initials: S
authors.lastname: Lathasree
authors.forename: B
authors.initials: B
authors.lastname: Sivasankar
authors.forename: V
authors.initials: V
authors.lastname: Sadasivam
authors.forename: K
authors.initials: K
authors.lastname: Rengaraj
mesh_terms: D000327:Adsorption; D001391:Azo Compounds / Q000302:isolation & purification*; D002244:Carbon / Q000737:chemistry*; D004396:Coloring Agents / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D008962:Models, Theoretical; D018508:Water Purification / Q000379:methods*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D002244:Carbon