In this work, the adsorption isotherm, Kinetic and thermodynamic of removal of Fe 3+ , Cu 2+ , Pb 2+ and Zn 2+ ) ions by activated carbon produced from rice husk were studied. The results shown that the Freundlich isotherm model achieved best fit with the equilibrium adsorption data for adsorption of (Fe 3+ , Cu 2+ and Pb 2+ ) ions, it is indicates to multilayer adsorption nature of these metal ions on RHAC. The adsorption capacity (K f ) of the adsorbent have a value of (312.1, 628.93 and 162.66 mg/g) for (Fe 3+ , Cu 2+ and Pb 2+ ), respectively. The Langmuir isotherm model gives best fit with the equilibrium adsorption data, it is instated to monolayer adsorption nature of (Zn 2+ ) ions on RHAC. The monolayer adsorption capacity (Q) have a value of (714.285 mg/g). The adsorption kinetics were followed the pseudo-second-order model, this model gives the best-fit to experimental data for all heavy metal ions which studied in this work. which have highest correlation coefficient values of (0.988 ,0.996 ,0.999 and 0.9232) for (Cu 2+ , Fe 3+ , Pb 2+ and Zn 2+ ), respectively. Also, the adsorption thermodynamic showed that the adsorption of heavy metal ions becomes more feasibility with increasing in temperature due to negative values of ΔG. The adsorption process is endothermicdue to positive values of ΔH.
In this study, a mathematical model was constructed according toCentral Composite Design method (CCD), which simulated the experimental work for adsorption of (Cu ) in batch adsorption processes, where this model was studied the different effects of operational conditions and their impact on the efficiency of adsorption by using activated carbon produced from rice husk as local raw material which is low cost and available in huge quantities,and find a final form simulates practical experiences. Finally a mathematical model has been used as a software program (minitab16).
In this study the efficiency of activated carbon produced from rice husk (RHAC) was studied to remove of Cu 2+ & Fe 3+ ions from waste oil water which comes out from the oil industry in Basrah city, and the efficiency of RHAC has been compared with efficiency of raw rice husk(RH) and commercial activated carbon(CAC). The effects of operating parameters were studied such as (contact time, adsorbent size, adsorbent dose, initial concentration of adsorbate, temperature, pH and rotation speed). The adsorption efficiency is arranged by (RHAC > CAC >RH) which removed 96.588, 92.9, 69.3% of Cu 2+ ions, and 94.54, 92.23, 72.66% of Fe 3+ ions onto RHAC, CAC & RH, respectively. The FTIR results showed that a different in functional groups was scattered in surface of adsorbent material, that causing the different in adsorption efficiencies of heavy metal ions.
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