THE REMOVAL OF PHENOL FROM AQUEOUS SOLUTIONS BY DEHYDRATED BEET PULP CARBON

摘要

The adsorption of phenol onto dehydrated beet pulp (DBP) was investigated at different initial pHs (1-12), temperatures (25-60℃), and phenol concentrations (25-500 mg L~(-1)). The optimum adsorption conditions were found to be 8.0 for initial pH, 100 mg L~(-1) for initial phenol concentration, 60℃ for temperature and 0.5 g L~(-1) for adsorbent dosage. Adsorption data were well-described by the Freundlich model, although they could also be modelled by Langmuir. The pseudo-first order and pseudo-second order kinetic models were applied to test the experimental data. It was concluded that the pseudo-second order kinetic model provided better correlation of the experimental data rather than the pseudo-first order model. The thermody-namic constants of the adsorption process were also evaluated by using the thermodynamic equilibrium coefficients obtained at different temperatures.