The Adsorption of Pb(II) Ions on Activated Carbon from Rice Husk, Irradiated by Ultrasonic Waves:Kinetic and Thermodynamics Studies

摘要

The research aim to determine the influence of variations of contact time, pH, and concentration on the udadsorption of Pb(II); adsorption capacity; kinetic parameters (reaction order and the value of k) and udthermodynamic parameters (Ea, ??G, ??H, ??S) for the adsorption of Pb(II) using rice husk activated carbonwere udirradiated with and without ultrasonic waves. Method is making rice husk activated carbon, the effect ofudvariation of time, pH, temperature and concentration. Analysis equation of pseudo first order reactionkinetics udand pseudo second order, analysis equation of Langmuir and Freundlich, and thermodynamics. The method of udanalysis used in this research was the infra-red spectrophotometer (FT-IR), the scanning electron microscopy ud(SEM). The irradiated activated carbon adsorption capacity is 16.6667 mg/g and without irradiated is 9.8039 udmg/g by Langmuir isotherm models. The optimum conditions for adsorption of Pb(II) at 50 minutes contact udtime, pH 5, temperature 40??C, whereas the concentration of Pb(II) 300 ppm adsorption is still experiencing. The udresult are suitable with the Langmuir isotherm models. Adsorption kinetics of Pb(II) were irradiated with udultrasonic waves followed the pseudo second order. Beside that thermodynamic parameters of ??H, ??S, ??G and udEa are -11.1075 kJ moleud-1ud, -0.04192 kJ moleud-1udK, -4.55433 kJ moleud-1ud, 0.80213 kcal. moleud-1ud, respectively.