Adsorption kinetics and equilibrium of copper from aqueous solutions using hazelnut shell activated carbon
| Autor: | Erhan Demirbas, Mehmet Kobya, Meral Topcu Sulak, Nadir Dizge |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Aqueous solution
Chemistry General Chemical Engineering Metal ions in aqueous solution Inorganic chemistry Langmuir adsorption model chemistry.chemical_element General Chemistry Copper Industrial and Manufacturing Engineering symbols.namesake Adsorption Desorption symbols medicine Environmental Chemistry Physical chemistry Freundlich equation Activated carbon medicine.drug |
| Zdroj: | Chemical Engineering Journal. 148:480-487 |
| ISSN: | 1385-8947 |
| Popis: | The adsorption of Cu(II) ions from aqueous solutions by hazelnut shell activated carbon (HSAC) was studied in a batch adsorption system. Factors influencing copper adsorption such as initial copper ion concentration (25–200 mg L−1), pH (2–6), adsorbent dosage (0.5–3.0 g L−1) and temperature (293–323 K) were investigated. The adsorption process was relatively fast and equilibrium was established about 90 min. Maximum adsorption of Cu(II) ions occurred at around pH 6. A comparison of the kinetic models on the overall adsorption rate showed that the adsorption system was best described by the pseudo second-order kinetics. Desorption experiments were carried out to test the performance of the carbon and desorption efficiencies in four cycles were found to be in the range 74–79%. The adsorption equilibrium data fitted best with the Langmuir isotherm and the monolayer adsorption capacity of Cu(II) ions was determined as 58.27 mg g−1 at 323 K. Thermodynamic parameters were calculated for the Cu(II) ion–HSAC system and the positive value of ΔH (18.77 kJ mol−1) showed that the adsorption was endothermic and physical in nature. |
| Databáze: | OpenAIRE |
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