title: Kinetics and mechanism of removal of methylene blue by adsorption onto perlite.
abstract: The kinetics and mechanism of methylene blue adsorption on perlite have been studied. The effects of various experimental parameters, such as initial dye concentration, temperature and pH on the adsorption rate were investigated. Adsorption measurements show that the process is very fast and physical in nature. The extent of the dye removal increased with increase in the initial concentration of the dye and the initial pH and temperature of solution. Adsorption data were modelled using the first and second-order kinetic equations, mass transfer and intra-particle diffusion models. It was shown that the second-order kinetic equation could best describe the sorption kinetics. The diffusion coefficient, D, was found to increase when the initial dye concentration, pH and temperature were raised. Thermodynamic activation parameters, such as DeltaG*, DeltaS* and DeltaH*, were calculated.
authors.affiliation: Department of Chemistry, Faculty of Science and Literature, Balikesir University, 10100 Balikesir, Turkey. mdogan@balikesir.edu.tr
authors.forename: Mehmet
authors.initials: M
authors.lastname: Doğan
authors.forename: Mahir
authors.initials: M
authors.lastname: Alkan
authors.forename: Aydin
authors.initials: A
authors.lastname: Türkyilmaz
authors.forename: Yasemin
authors.initials: Y
authors.lastname: Ozdemir
mesh_terms: D000327:Adsorption; D000537:Aluminum Oxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008751:Methylene Blue / Q000737:chemistry* / Q000302:isolation & purification*; D008956:Models, Chemical; D012822:Silicon Dioxide / Q000737:chemistry*; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D014874:Water Pollutants, Chemical; C003076:Perlite; D012822:Silicon Dioxide; D000537:Aluminum Oxide; D008751:Methylene Blue