| Titre : |
Oxidation of Cr3+ to Cr6 by hydroxyl radicals in leather |
| Type de document : |
texte imprimé |
| Auteurs : |
Ling Zhang, Auteur ; Yu Congzheng, Auteur ; Yang Hongmin, Auteur ; Hu Qiang, Auteur |
| Année de publication : |
2010 |
| Article en page(s) : |
p. 156-160 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Chrome trivalent -- Oxydation
Cuirs et peaux
Hydroxylation
|
| Tags : |
Cuir Tannage Chrome Oxydation 'Radicaux hydroxyles' 'Acide benzoïque' 'Réactif de Fenton' 'Dichromate potassium' 'Spectroscopie ultraviolette' |
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
This study assesses the role of hydroxyl radicals (OH) on the formation of Cr6+ in leather. To avoid the complexity of composition of chemicals produced in leather fatliquors. OH produced from the oxidation of lipids in leather fatliquors was replaced by OH produced by a fenton reagent.
At room temperature, Fenton reagent was reacted with solutions of CrCl3, CrCl3-benzoic acid, chrome tanning agent and chrome tanning agent-benzoic acid, respectively. The amounts of Cr6+ was explored and the effect of adding an OH scavenger(benzoic acid) on inhibiting the formation of Cr6+ was also studied.
Using ultraviolet spectrometry, the molecular structure of benzoic acid was analysed both before and after oxidation by Fenton reagent or potassium dichromate. The oxidization of Cr3+ to Cr6° by Fenton reagent was initially explored. The results showed that the OH group can oxidize Cr3+ to Cr6+ in both systems of CrCl3 and chrome tanning agent and the OH scavenger can inhibit the production of Cr6+. When the amount of benzoic acid was 3wt.% of the chrome the Cr6+ concentration was decreased by 99.3 % in 90 minutes. |
| En ligne : |
https://drive.google.com/file/d/1gNTHd8wfl8LJkh665-JpBKuDX3FPiFKq/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9858 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 94, N° 4 (07-08/2010) . - p. 156-160
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Oxidation of Cr3+ to Cr6 by hydroxyl radicals in leather in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 4 (07-08/2010)
