title: Removal of basic dye using raw and acid activated bentonite samples.
abstract: The adsorption behavior of crystal violet (CV(+)) from aqueous solution onto raw (RB) and acid activated (AAB) bentonite samples was investigated as a function of parameters such as initial CV(+) concentration, contact time and temperature. The Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms. The adsorption rate was fast and more than half of the adsorbed-CV(+) was removed in the first 55 min for RB and 25 min for 0.2-AAB at the room temperature (C(0)=1.2 mmol/g). The pseudo-first order, and pseudo-second order kinetic models were used to describe the kinetic data and rate constants were evaluated. The results best fit the pseudo-second order kinetic model with the rate constant, k(2), in the range of 13.52 x 10(-2) to 5.53 x 10(-2)g/mmol and 52.70 x 10(-2) to 6.69 x 10(-2)mmol/g min for RB and 0.2-AAB sample, respectively (C(0)=0.1-1.2 mmol/g).
authors.affiliation: Ahi Evran University, Faculty of Arts and Science, Department of Chemistry, 40100 Kirsehir, Turkey. eeren@ahievran.edu.tr
authors.forename: E
authors.initials: E
authors.lastname: Eren
authors.forename: B
authors.initials: B
authors.lastname: Afsin
mesh_terms: D000327:Adsorption; D001546:Bentonite / Q000737:chemistry*; D004396:Coloring Agents / Q000302:isolation & purification*; D007220:Industrial Waste / Q000517:prevention & control*; D007700:Kinetics; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
chemical_list: D004396:Coloring Agents; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D001546:Bentonite