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Cellulose triacetate optical film preparation from ramie fiber / Xiushan Fan in Industrial & engineering chemistry research, Vol. 48 N° 13 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6212–6215 Titre : Cellulose triacetate optical film preparation from ramie fiber Type de document : texte imprimé Auteurs : Xiushan Fan, Auteur ; Zhong-Wen Liu, Auteur ; Jian Lu, Auteur Année de publication : 2009 Article en page(s) : pp. 6212–6215 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Cellulose  triacetate  optical  films  Ramie  fiber  Biomass Résumé : A new route for the preparation of cellulose triacetate (CTA) optical films from the biomass of ramie fiber has been found with environmental benefits. CTA with a degree of substitution (DS) of 2.81−2.92 was prepared by the reaction of acetic anhydride with ramie fiber catalyzed by sulfuric acid in acetic acid solution at 55 °C. The CTA film was prepared by casting the solution of CTA dissolving in dichloromethane on the culture disk via spreading the solution through a syringe. The structure and properties of CTA and its film were investigated by Fourier transform infrared (FT-IR), ultraviolet (UV), X-ray diffraction (XRD), nuclear magnetic resonance (NMR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and titration. It was found that the CTA films prepared from ramie fiber shows a high transparency of 89% and excellent mechanical properties with stress measurements of 31.04−47.80 MPa and strain of 3.99−5.22%. The CTA films prepared from ramie fiber are suitable as protective films for the liquid crystal displays (LCD). En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801703x [article] Cellulose triacetate optical film preparation from ramie fiber [texte imprimé] / Xiushan Fan, Auteur ; Zhong-Wen Liu, Auteur ; Jian Lu, Auteur . - 2009 . - pp. 6212–6215. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6212–6215 Mots-clés : Cellulose  triacetate  optical  films  Ramie  fiber  Biomass Résumé : A new route for the preparation of cellulose triacetate (CTA) optical films from the biomass of ramie fiber has been found with environmental benefits. CTA with a degree of substitution (DS) of 2.81−2.92 was prepared by the reaction of acetic anhydride with ramie fiber catalyzed by sulfuric acid in acetic acid solution at 55 °C. The CTA film was prepared by casting the solution of CTA dissolving in dichloromethane on the culture disk via spreading the solution through a syringe. The structure and properties of CTA and its film were investigated by Fourier transform infrared (FT-IR), ultraviolet (UV), X-ray diffraction (XRD), nuclear magnetic resonance (NMR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and titration. It was found that the CTA films prepared from ramie fiber shows a high transparency of 89% and excellent mechanical properties with stress measurements of 31.04−47.80 MPa and strain of 3.99−5.22%. The CTA films prepared from ramie fiber are suitable as protective films for the liquid crystal displays (LCD). En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801703x

Chemically modified chicken feather as sorbent for removing toxic chromium(VI) ions / Ping Sun in Industrial & engineering chemistry research, Vol. 48 N° 14 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6882–6889 Titre : Chemically modified chicken feather as sorbent for removing toxic chromium(VI) ions Type de document : texte imprimé Auteurs : Ping Sun, Auteur ; Zhao-Tie Liu, Auteur ; Zhong-Wen Liu, Auteur Année de publication : 2009 Article en page(s) : pp. 6882–6889 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Chromium(VI)  ions  Chicken  feathers Résumé : To improve the sorption capacity of Cr(VI) ions, chicken feathers (CFs) were chemically treated by several methods: (1) To clarify the changes in the structure and morphology of CFs, CFs were treated with aqueous NaOH solutions of varying concentrations. The results suggest that reactions occur on the surface rather than in the interior of the CFs and that keratin fragments exfoliate from the CF surface layer by layer and then dissolve in aqueous solution. (2) Keratin fragments could be rejoined to the CF surface by cross-linking with epichlorohydrin (Epi) through a series of ring-opening, recyclization, and ring-opening reactions of Epi in aqueous NaOH solution, and Epi-modified CF (EpiCF) was obtained. (3) CFs were functionalized with ethylenediamine (EA) in aqueous NaOH solution by cross-linking with Epi (EAEpiCF). The structure and properties of chemically treated CFs were investigated by FT-IR spectroscopy, XRD, SEM, elemental analysis, and water contact-angle measurements. CFs treated with NaOH were found to be similar in structure and properties to each other and exhibited a relatively low sorption capacity for removal of Cr(VI) ions from water, but a higher capacity than raw CFs. EpiCF exhibited an excellent capacity for adsorbing relatively low concentrations (10 ppm) of Cr(VI) ions but a low sorption capacity for Cu(II) ions in water. EAEpiCF was found to be hydrophilic and to exhibit 90% efficiency for removing Cr(VI) ions in the concentration range of 10−80 ppm but to have a low sorption capacity for Cu(II) in water. Equilibrium sorption isotherms for the raw and chemically treated CFs fit the Freundlich and Dubinin−Radushkevich (D−R) isotherm models; however, the Langmuir model was not able to describe the sorption behavior. The values of the free sorption energy (E) were calculated. The E values of NaOH-treated CFs were found to be similar to each other and much larger than that of raw CFs for the sorption of Cr(VI), and the sorption processes were found to be physical. The process of EpiCF adsorbing Cr(VI) ions from water is chemisorption, and that for Cu(II) ions is physisorption. The free sorption energy of EAEpiCF sorption of Cr(VI) ions was close to 8 kJ·mol−1 (7.274 kJ·mol−1), so that chemical interactions might exist between EAEpiCF and Cr(VI), whereas for Cu(II), the sorption process is physical adsorption. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900106h [article] Chemically modified chicken feather as sorbent for removing toxic chromium(VI) ions [texte imprimé] / Ping Sun, Auteur ; Zhao-Tie Liu, Auteur ; Zhong-Wen Liu, Auteur . - 2009 . - pp. 6882–6889. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6882–6889 Mots-clés : Chromium(VI)  ions  Chicken  feathers Résumé : To improve the sorption capacity of Cr(VI) ions, chicken feathers (CFs) were chemically treated by several methods: (1) To clarify the changes in the structure and morphology of CFs, CFs were treated with aqueous NaOH solutions of varying concentrations. The results suggest that reactions occur on the surface rather than in the interior of the CFs and that keratin fragments exfoliate from the CF surface layer by layer and then dissolve in aqueous solution. (2) Keratin fragments could be rejoined to the CF surface by cross-linking with epichlorohydrin (Epi) through a series of ring-opening, recyclization, and ring-opening reactions of Epi in aqueous NaOH solution, and Epi-modified CF (EpiCF) was obtained. (3) CFs were functionalized with ethylenediamine (EA) in aqueous NaOH solution by cross-linking with Epi (EAEpiCF). The structure and properties of chemically treated CFs were investigated by FT-IR spectroscopy, XRD, SEM, elemental analysis, and water contact-angle measurements. CFs treated with NaOH were found to be similar in structure and properties to each other and exhibited a relatively low sorption capacity for removal of Cr(VI) ions from water, but a higher capacity than raw CFs. EpiCF exhibited an excellent capacity for adsorbing relatively low concentrations (10 ppm) of Cr(VI) ions but a low sorption capacity for Cu(II) ions in water. EAEpiCF was found to be hydrophilic and to exhibit 90% efficiency for removing Cr(VI) ions in the concentration range of 10−80 ppm but to have a low sorption capacity for Cu(II) in water. Equilibrium sorption isotherms for the raw and chemically treated CFs fit the Freundlich and Dubinin−Radushkevich (D−R) isotherm models; however, the Langmuir model was not able to describe the sorption behavior. The values of the free sorption energy (E) were calculated. The E values of NaOH-treated CFs were found to be similar to each other and much larger than that of raw CFs for the sorption of Cr(VI), and the sorption processes were found to be physical. The process of EpiCF adsorbing Cr(VI) ions from water is chemisorption, and that for Cu(II) ions is physisorption. The free sorption energy of EAEpiCF sorption of Cr(VI) ions was close to 8 kJ·mol−1 (7.274 kJ·mol−1), so that chemical interactions might exist between EAEpiCF and Cr(VI), whereas for Cu(II), the sorption process is physical adsorption. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900106h

The [Bmim]4W10O23 catalyzed oxidation of 3,4-diaminofurazan to 3,4-dinitrofurazan in hydrogen peroxide / Hua-Ping Ren in Industrial & engineering chemistry research, Vol. 50 N° 11 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp 6615–6619 Titre : The [Bmim]4W10O23 catalyzed oxidation of 3,4-diaminofurazan to 3,4-dinitrofurazan in hydrogen peroxide Type de document : texte imprimé Auteurs : Hua-Ping Ren, Auteur ; Zhong-Wen Liu, Auteur ; Jian Lu, Auteur Année de publication : 2011 Article en page(s) : pp 6615–6619 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : catalyzed  oxidation  Hydrogen  Peroxide. Résumé : -Methyl-3-butylimidazolium decatungstate ([C8H15N2]4W10O23, [Bmim]4W10O23) was prepared from 1-butyl-3-methylimidazolium bromide and sodium tungstate in hydrochloric acid solution. With the use of [Bmim]4W10O23 as the catalyst and 50% H2O2 as the oxidant, 3,4-dinitrofurazan (, DNF) was synthesized from 3,4-diaminofurazan (, DAF) in concentrated H2SO4. At a temperature of 35 °C, this process significantly increased the DNF yield from 39% to 58%, when compared with that with the conventional Na2WO4·2H2O catalyst under the same conditions. The effects of catalyst, reaction time, and temperature were investigated. A maximum DNF yield of 58% was obtained under optimal reaction conditions: 0.03 g of [Bmim]4W10O23, H2O2/H2SO4 molar ratio of 1.5:1, temperature and reaction time of 35 °C and 210 min, respectively. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200009g [article] The [Bmim]4W10O23 catalyzed oxidation of 3,4-diaminofurazan to 3,4-dinitrofurazan in hydrogen peroxide [texte imprimé] / Hua-Ping Ren, Auteur ; Zhong-Wen Liu, Auteur ; Jian Lu, Auteur . - 2011 . - pp 6615–6619. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp 6615–6619 Mots-clés : catalyzed  oxidation  Hydrogen  Peroxide. Résumé : -Methyl-3-butylimidazolium decatungstate ([C8H15N2]4W10O23, [Bmim]4W10O23) was prepared from 1-butyl-3-methylimidazolium bromide and sodium tungstate in hydrochloric acid solution. With the use of [Bmim]4W10O23 as the catalyst and 50% H2O2 as the oxidant, 3,4-dinitrofurazan (, DNF) was synthesized from 3,4-diaminofurazan (, DAF) in concentrated H2SO4. At a temperature of 35 °C, this process significantly increased the DNF yield from 39% to 58%, when compared with that with the conventional Na2WO4·2H2O catalyst under the same conditions. The effects of catalyst, reaction time, and temperature were investigated. A maximum DNF yield of 58% was obtained under optimal reaction conditions: 0.03 g of [Bmim]4W10O23, H2O2/H2SO4 molar ratio of 1.5:1, temperature and reaction time of 35 °C and 210 min, respectively. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200009g