Kinetic and equilibrium studies of phenol adsorption by natural and modified forms of the clinoptilolite.
The contribution presents results of investigation of phenol adsorption by the raw, HDTMA- and NaOH-modified clinoptilolite. The experimental data on the sorption kinetic process are modelled using the particle and the film diffusion models with calculation of a rate constant of intraparticle mass transfer. Two main stages may be divided in the kinetic sorption process: (1) initial rapid sorption (amount of phenol sorbed 85-90%) extending over the first 60 min and (2) stage of slow approach to equilibrium covering about 8h. Equilibrium isotherms for phenol adsorption are modelled using the Langmuir, Freundlich and Dubinin-Radushkevich equations. The Freundlich isotherm describes in a greater degree phenol sorption from aqueous solutions of low phenol concentrations, while the Langmuir isotherm fits better to sorption at high initial concentrations.
Department of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University, 87-100 Torun, Poland.sprynsky@yahoo.com
Myroslav
M
Sprynskyy
Tomasz
T
Ligor
Mariya
M
Lebedynets
Bogusław
B
Buszewski
D000327:Adsorption; D004058:Diffusion; D007700:Kinetics; D008956:Models, Chemical; D019800:Phenol / Q000302:isolation & purification*; D013816:Thermodynamics; D017641:Zeolites / Q000737:chemistry*
C083175:clinoptilolite; D017641:Zeolites; D019800:Phenol