Adsorption of phosphate into waste oyster shell: thermodynamic parameters and reaction kinetics
| Autor: | Po-Kang Shih, Wen-Lian Chang, Chiao-Wen Lin, Wan Ting Chen |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Desalination and Water Treatment. 47:86-95 |
| ISSN: | 1944-3986 1944-3994 |
| DOI: | 10.1080/19443994.2012.696800 |
| Popis: | The present study explored the feasibility of exploiting an oyster shell as an adsorbent to remove the phosphate pollutants under different laboratory experimental conditions. The batch sorption was investigated for the solution temperature and the size of the oyster shell fragments. The results demonstrated that phosphate uptake capacity (q e) increased with an increase in the solution temperature from 20 to 30°C and a decrease in the oyster shell diameter from 590 to 180 μm at an initial phosphate solution concentration of 10 mg/L. The thermodynamic parameters of the adsorption process were calculated. The positive value of ΔH° (40.61 kJ/mol) indicated that the adsorption of phosphate on oyster shell was endothermic; the positive value of ΔS showed good affinity of the phosphate toward the oyster shell; the positive value of ΔG (12.60 kJ/mol) suggested that the adsorption of phosphate into an oyster shell was a nonspontaneous reaction. Following the evaluation of the thermodynamic parameters, d... |
| Databáze: | OpenAIRE |
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