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.
Sprynskyy
Myroslav
M
Department of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University, 87-100 Torun, Poland.sprynsky@yahoo.com
Ligor
Tomasz
T
Lebedynets
Mariya
M
Buszewski
Bogusław
B
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