Kinetics of copper (II) adsorption by bentonite in mixed solvents

Abstract

Bentonite clays are known for their industrial importance kinetics and mechanism of Cu(II) ions adsorption on local bentonite have been studied The effect of Cu(II) ions concerntration solving and mixing rates were investigated Adsorption measurements showed that the process is very fast and physical in nature The initial Cu(II) concentration mixing rate and aolvent type affected the rate of the adsorption reaction Data were modeled using first and second order kinetic equation mass transfer and intraparticle diffusion models The second order kinetic equation showed to best describe the sorption kinetics furthermore the adsorption from water and methanolwater follow freundich and from acetonewater follows Langmuir isotherms The adsorption mechanism did not fit the mass transfer nor intrapracticle diffusion models indiacting that Cu(II) is exchange by cation on the bentonite surface