Optimization of copper (II) removal from aqueous solution by modified oyster shells using response surface methodology
Wijdane LIMOUNI, Mohamed CHAFI
Abstract
The ideal conditions for the adsorption of Cu (II) ions on modified oyster shells from aqueous solution were investigated. The effect of four adsorption variables (pH, initial pollutant concentration, adsorbent mass and contact time) was studied using central composite design (CCD) under the response surface methodology (RSM) in order to determine optimal copper treatment conditions. Experimental results indicated that optimal copper removal was obtained at pH (5.5), adsorbent dosage (2g), initial copper ions concentration (150 mg/l) and contact time (2.5h). The kinetic study of adsorption was tested using pseudo-first-order and pseudo-second-order models. The results showed that the adsorption of Cu (II) ions progresses according to the pseudo-second-order model. The experimental data were analyzed by Langmuir, Freundlich and Temkin isothermal models. The study concluded that oyster shells have potential application as an efficient adsorbent to remove toxic and heavy metal like copper from industrial waste water.
Keywords
References
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