Ads orption of phenol o n bentonit e: A stud y of equilibrium adsorption isotherms

In this s tudy equilibrium adsorption isotherm for the removal of phenol from aqueo us solution using bento nite has been investiga ted. Liquid phase adso rption expe riments were conducted and the maximum adsorptive capacity was determined . The effec t of pH was studied. Equilibrium data were mathematically modeled using the L angmuir, Freundlich an d Temkin adsorption models to describe the equilibrium isotherms a t ۶.۶۴ solution pH val ue and ۲۵° C temperature, and isotherm constants were determined. The results indicate t he potential use of the adsorbent f or the removal of phenol from aqueous solutio n. Maximum adsorptio n capacity of ۳۰۳.۰۳ m g/g at ۲۵°C at equilibrium was achieved. It was found that pH plays a major ro le in the adsorption pro cess. The op timum pH f or the removal of phenol from aqu eous solution under the experime ntal conditio ns used in this work w as ۶.۶۴. T he Langmuir isotherm was found t o best fit the experimental data over the whole concentratio n range as indicating f rom the valu es of the correlation coe fficients (r۲ > ۰.۹۳۲۸).

کلیدواژه ها:

Adsorption ، Bentonite ، Phenol ، Isotherms