A novel substitution-based method for effective leaching of chromium (III) from chromium-tanned leather waste : The thermodynamics, kinetics and mechanism studies
Copyright © 2019 Elsevier Ltd. All rights reserved.
| Veröffentlicht in: | Waste management (New York, N.Y.). - 1999. - 103(2020) vom: 15. Feb., Seite 276-284 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2020
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| Zugriff auf das übergeordnete Werk: | Waste management (New York, N.Y.) |
| Schlagworte: | Journal Article Chromium (III) Leaching kinetics Leather waste Sodium oxalate Substitution mechanism Thermodynamics Chromium 0R0008Q3JB |
| Zusammenfassung: | Copyright © 2019 Elsevier Ltd. All rights reserved. A substitution-based method for chromium (III) leaching from chromium-tanned leather waste (CTLW) without destroying the collagen matrix was proposed. The leaching efficiency of Cr (III) from CTLW using different organic salts was investigated and sodium oxalate (OA-2Na) was considered to be the best Cr leaching agent. The effects of leaching time, temperature, pH, concentration, shaking speed and leather thickness on Cr leaching rate were investigated and a Cr leaching rate of 98% was obtained. Thermodynamic parameters (ΔG0 < 0, ΔH0 > 0 and ΔS0 > 0) were obtained in this study. The kinetic data fitted well with the first-order kinetic equation. The apparent activation energy (Ea = 82.9563 kJ/mol) and the frequency factor (A = 2.96 × 1011) were obtained. The collagen matrix remained intact after Cr leaching by the characterization of SEM and FTIR. A substitution mechanism was proposed that Cr (III) in CTLW was complexed with oxalate and dissociated from the collagen matrix |
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| Beschreibung: | Date Completed 19.05.2020 Date Revised 19.05.2020 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1879-2456 |
| DOI: | 10.1016/j.wasman.2019.12.039 |