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Integrated reductive / adsorptive detoxification of Cr (VI) - contaminated water by polypyrrole / cellulose fiber composite / Yu Lei in Industrial & engineering chemistry research, Vol.51 N° 31 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol.51 N° 31 (Août 2012) . - pp. 10408-10415 Titre : Integrated reductive / adsorptive detoxification of Cr (VI) - contaminated water by polypyrrole / cellulose fiber composite Type de document : texte imprimé Auteurs : Yu Lei, Auteur ; Xueren Qian, Auteur ; Jing Shen, Auteur Année de publication : 2012 Article en page(s) : pp. 10408-10415 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Composite  material  Water  pollution  Detoxification Résumé : For detoxification of Cr(VI)-contaminated water, a new process concept of using conductive polypyrrole/ cellulose fiber composite (prepared by in situ polymerization of pyrrole in the presence of cellulose fibers) for water treatment was proposed and demonstrated. The effects of preparation conditions of the composite, as well as the water treatment conditions, on the detoxification efficiency were studied. Under the optimized conditions, the composite was highly effective in Cr(VI) detoxification. The desorption results and XPS analyses showed that the highly toxic Cr(VI) was reduced to less toxic Cr(III) and then adsorbed onto the composite. At least 3/4 of the Cr adsorbed to the composite was Cr(III). ATR-FTIR spectra and SEM images also proved that redox reaction occurred during the water treatment process. The integrated reductive/ adsorptive Cr(VI) detoxification by polypyrrole-engineered cellulose fibers would provide new possibilities for the commercial application of conductive fibers. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26234072 [article] Integrated reductive / adsorptive detoxification of Cr (VI) - contaminated water by polypyrrole / cellulose fiber composite [texte imprimé] / Yu Lei, Auteur ; Xueren Qian, Auteur ; Jing Shen, Auteur . - 2012 . - pp. 10408-10415. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol.51 N° 31 (Août 2012) . - pp. 10408-10415 Mots-clés : Composite  material  Water  pollution  Detoxification Résumé : For detoxification of Cr(VI)-contaminated water, a new process concept of using conductive polypyrrole/ cellulose fiber composite (prepared by in situ polymerization of pyrrole in the presence of cellulose fibers) for water treatment was proposed and demonstrated. The effects of preparation conditions of the composite, as well as the water treatment conditions, on the detoxification efficiency were studied. Under the optimized conditions, the composite was highly effective in Cr(VI) detoxification. The desorption results and XPS analyses showed that the highly toxic Cr(VI) was reduced to less toxic Cr(III) and then adsorbed onto the composite. At least 3/4 of the Cr adsorbed to the composite was Cr(III). ATR-FTIR spectra and SEM images also proved that redox reaction occurred during the water treatment process. The integrated reductive/ adsorptive Cr(VI) detoxification by polypyrrole-engineered cellulose fibers would provide new possibilities for the commercial application of conductive fibers. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26234072

Lime treatment of prehydrolysis liquor from the kraft - based dissolving pulp production process / Jing Shen in Industrial & engineering chemistry research, Vol. 51 N° 2 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 662–667 Titre : Lime treatment of prehydrolysis liquor from the kraft - based dissolving pulp production process Type de document : texte imprimé Auteurs : Jing Shen, Auteur ; Pedram Fatehi, Auteur ; Pendar Soleimani, Auteur Année de publication : 2012 Article en page(s) : pp. 662–667 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Prehydrolysis  liquor Résumé : In this study, the concept of using lime for the treatment of industrially produced prehydrolysis liquor (PHL) of kraft-based dissolving pulp production process was tested, and its effect on the concentrations of acetic acid, furfural, UV lignin, and hemicelluloses was explored. Lime treatment resulted in a significant increase in the acetic acid concentration due to alkaline hydrolysis of the acetyl groups bound to the dissolved hemicelluloses in PHL, and the degradation of sugars. At relatively high lime dosages (e.g., above 1.7%), furfural was completely eliminated, while the lignin concentration decreased by 20–25%. The hemicelluloses concentration can be significantly decreased due to the alkaline oxidative degradation. However, when performed in the absence of oxygen/air by bubbling carbon dioxide to the lime/PHL system, the degradation of hemicelluloses was effectively minimized. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2019195 [article] Lime treatment of prehydrolysis liquor from the kraft - based dissolving pulp production process [texte imprimé] / Jing Shen, Auteur ; Pedram Fatehi, Auteur ; Pendar Soleimani, Auteur . - 2012 . - pp. 662–667. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 662–667 Mots-clés : Prehydrolysis  liquor Résumé : In this study, the concept of using lime for the treatment of industrially produced prehydrolysis liquor (PHL) of kraft-based dissolving pulp production process was tested, and its effect on the concentrations of acetic acid, furfural, UV lignin, and hemicelluloses was explored. Lime treatment resulted in a significant increase in the acetic acid concentration due to alkaline hydrolysis of the acetyl groups bound to the dissolved hemicelluloses in PHL, and the degradation of sugars. At relatively high lime dosages (e.g., above 1.7%), furfural was completely eliminated, while the lignin concentration decreased by 20–25%. The hemicelluloses concentration can be significantly decreased due to the alkaline oxidative degradation. However, when performed in the absence of oxygen/air by bubbling carbon dioxide to the lime/PHL system, the degradation of hemicelluloses was effectively minimized. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2019195