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Degradation of methylene blue by heterogeneous fenton reaction using titanomagnetite at neutral pH values / Shijian Yang in Industrial & engineering chemistry research, Vol. 48 N° 22 (Novembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 9915–9921 Titre : Degradation of methylene blue by heterogeneous fenton reaction using titanomagnetite at neutral pH values : process and affecting factors Type de document : texte imprimé Auteurs : Shijian Yang, Auteur ; Hongping He, Auteur ; Daqing Wu, Auteur Année de publication : 2010 Article en page(s) : pp. 9915–9921 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Titanomagnetite  Methylene  blue Résumé : In this work, titanomagnetite was used as a heterogeneous Fenton catalyst for the degradation of methylene blue (MB). The degradation of MB on synthetic titanomagnetite at neutral pH values was studied in comparison with the adsorption of MB on titanomagnetite using UV−vis, FTIR, and the analyses of element C on titanomagnetite and DOC in reaction solution. Meanwhile, important factors affecting catalytic activity were investigated, that is, titanomagnetite load, H2O2 concentration, and reaction temperature. Titanomagnetite decomposed H2O2 yielding highly reactive hydroxyl radicals, and MB adsorbed on titanomagnetite was degraded. With the increases of titanomagnetite load, H2O2 concentration, and reaction temperature, the degradation of MB was promoted. Moreover, titanomagnetite was proved to be durable with a stable MB removal efficiency after five consecutive cycles. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900666b [article] Degradation of methylene blue by heterogeneous fenton reaction using titanomagnetite at neutral pH values : process and affecting factors [texte imprimé] / Shijian Yang, Auteur ; Hongping He, Auteur ; Daqing Wu, Auteur . - 2010 . - pp. 9915–9921. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 9915–9921 Mots-clés : Titanomagnetite  Methylene  blue Résumé : In this work, titanomagnetite was used as a heterogeneous Fenton catalyst for the degradation of methylene blue (MB). The degradation of MB on synthetic titanomagnetite at neutral pH values was studied in comparison with the adsorption of MB on titanomagnetite using UV−vis, FTIR, and the analyses of element C on titanomagnetite and DOC in reaction solution. Meanwhile, important factors affecting catalytic activity were investigated, that is, titanomagnetite load, H2O2 concentration, and reaction temperature. Titanomagnetite decomposed H2O2 yielding highly reactive hydroxyl radicals, and MB adsorbed on titanomagnetite was degraded. With the increases of titanomagnetite load, H2O2 concentration, and reaction temperature, the degradation of MB was promoted. Moreover, titanomagnetite was proved to be durable with a stable MB removal efficiency after five consecutive cycles. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900666b

Elemental mercury capture from flue gas by magnetic Mn–Fe spinel / Shijian Yang in Industrial & engineering chemistry research, Vol. 50 N° 16 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 16 (Août 2011) . - pp. 9650-9656 Titre : Elemental mercury capture from flue gas by magnetic Mn–Fe spinel : effect of chemical heterogeneity Type de document : texte imprimé Auteurs : Shijian Yang, Auteur ; Yongfu Guo, Auteur ; Naiqiang Yan, Auteur Année de publication : 2011 Article en page(s) : pp. 9650-9656 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Heterogeneity  Gaseous  effluent  Zerovalent  metal Résumé : A stoichiometric nanosized Mn―Fe spinel (Fe2.2Mno0.8O4) was synthesized using a coprecipitation method. After the thermal treatment at 400 °C under air, chemical heterogeneity deriving from the oxidation kinetic difference between Fe2+ and Mn2+/Mn3+ was observed in (Fe2.2Mn0.8)1-δO4. XPS and TEM analyses both pointed a Mn enrichment (especially Mn4+ cation) on the particle's surface. Furthermore, the percent of cation vacancy on the surface increased obviously due to the enrichment of Mn4+ cation on the surface. As a result, the capacity of (Fe2.2Mn0.8)1-δ-400 for elemental mercury capture was generally much better than those of MnOx/γ-Fe2O3, (Fe2.2Mn0.8)1-δO4-200 and Fe2.2Mn0.8O4. Furthermore, the saturation magnetization of (Fe2.2Mn0.8)1-δO4 obviously increased after the thermal treatment under air at 400 °C, which made it easier to separate the sorbent and adsorbed mercury from the fly ash for recycling, regeneration, and safe disposal of the adsorbed mercury. Therefore, (Fe2.2Mn0.8)1-δO4-400 may be a promising sorbent for elemental mercury capture. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24425209 [article] Elemental mercury capture from flue gas by magnetic Mn–Fe spinel : effect of chemical heterogeneity [texte imprimé] / Shijian Yang, Auteur ; Yongfu Guo, Auteur ; Naiqiang Yan, Auteur . - 2011 . - pp. 9650-9656. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 16 (Août 2011) . - pp. 9650-9656 Mots-clés : Heterogeneity  Gaseous  effluent  Zerovalent  metal Résumé : A stoichiometric nanosized Mn―Fe spinel (Fe2.2Mno0.8O4) was synthesized using a coprecipitation method. After the thermal treatment at 400 °C under air, chemical heterogeneity deriving from the oxidation kinetic difference between Fe2+ and Mn2+/Mn3+ was observed in (Fe2.2Mn0.8)1-δO4. XPS and TEM analyses both pointed a Mn enrichment (especially Mn4+ cation) on the particle's surface. Furthermore, the percent of cation vacancy on the surface increased obviously due to the enrichment of Mn4+ cation on the surface. As a result, the capacity of (Fe2.2Mn0.8)1-δ-400 for elemental mercury capture was generally much better than those of MnOx/γ-Fe2O3, (Fe2.2Mn0.8)1-δO4-200 and Fe2.2Mn0.8O4. Furthermore, the saturation magnetization of (Fe2.2Mn0.8)1-δO4 obviously increased after the thermal treatment under air at 400 °C, which made it easier to separate the sorbent and adsorbed mercury from the fly ash for recycling, regeneration, and safe disposal of the adsorbed mercury. Therefore, (Fe2.2Mn0.8)1-δO4-400 may be a promising sorbent for elemental mercury capture. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24425209