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Bioaugmentation and functional partitioning in a zero valent iron - anaerobic reactor for sulfate - containing wastewater treatment / Jingxin Zhang in Chemical engineering journal, Vol. 174 N° 1 (Octobre 2011) 

Public ISBD [article]  in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.159-165 Titre : Bioaugmentation and functional partitioning in a zero valent iron - anaerobic reactor for sulfate - containing wastewater treatment Type de document : texte imprimé Auteurs : Jingxin Zhang, Auteur ; Yaobin Zhang, Auteur ; Xie Quan, Auteur Année de publication : 2012 Article en page(s) : pp.159-165 Note générale : Génie chimique Langues : Anglais (eng) Mots-clés : Sulfate-containing  wastewater  Zero-valent  iron  Anaerobic  Two-stage  anaerobic  reactor Résumé : Sulfate inhibits anaerobic digestion because it stimulates sulfate reduction bacteria (SRB) to compete with methanogens for electron utilization and sulfide produced has toxicity to microorganism. Considering that zero-valent iron (ZVI) is expected to abbreviate the above negative effects due to its reductibility, a ZVI bed was packed into an anaerobic (ZVI-anaerobic) reactor (R1) for improvement of sulfate-containing wastewater treatment. The results showed that R1 could maintain high COD removal performance (87.4%) at sulfate concentration (1100 mg/L), significantly higher than a control reactor without ZVI (R2, 58.2%). In R1, 95% of the sulfate was reduced at the bottom, which decreased its effects on methanogens in the upper portion. In consequence, the COD removal in the upper portion of R1 (39.4%) was significantly higher than that of R2 (11.4%). Fluorescence in situ hybridization showed that the fractions of methanogens and SRB presented highest in the upper portion and the bottom of R1 respectively. PCR–DGGE analysis indicated that the microbial communities between the bottom and the upper part of R1 were different and diversity by the addition of ZVI bed. The functionalized partitioning of microbial activities in R1, i.e., most sulfate reduction occurring in the bottom and more efficient methanogenesis occurring in the upper, which was similar to a two-stage anaerobic reactor for sulfate-containing wastewater treatment, made this ZVI-anaerobic reactor displayed well. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010278 [article] Bioaugmentation and functional partitioning in a zero valent iron - anaerobic reactor for sulfate - containing wastewater treatment [texte imprimé] / Jingxin Zhang, Auteur ; Yaobin Zhang, Auteur ; Xie Quan, Auteur . - 2012 . - pp.159-165. Génie chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.159-165 Mots-clés : Sulfate-containing  wastewater  Zero-valent  iron  Anaerobic  Two-stage  anaerobic  reactor Résumé : Sulfate inhibits anaerobic digestion because it stimulates sulfate reduction bacteria (SRB) to compete with methanogens for electron utilization and sulfide produced has toxicity to microorganism. Considering that zero-valent iron (ZVI) is expected to abbreviate the above negative effects due to its reductibility, a ZVI bed was packed into an anaerobic (ZVI-anaerobic) reactor (R1) for improvement of sulfate-containing wastewater treatment. The results showed that R1 could maintain high COD removal performance (87.4%) at sulfate concentration (1100 mg/L), significantly higher than a control reactor without ZVI (R2, 58.2%). In R1, 95% of the sulfate was reduced at the bottom, which decreased its effects on methanogens in the upper portion. In consequence, the COD removal in the upper portion of R1 (39.4%) was significantly higher than that of R2 (11.4%). Fluorescence in situ hybridization showed that the fractions of methanogens and SRB presented highest in the upper portion and the bottom of R1 respectively. PCR–DGGE analysis indicated that the microbial communities between the bottom and the upper part of R1 were different and diversity by the addition of ZVI bed. The functionalized partitioning of microbial activities in R1, i.e., most sulfate reduction occurring in the bottom and more efficient methanogenesis occurring in the upper, which was similar to a two-stage anaerobic reactor for sulfate-containing wastewater treatment, made this ZVI-anaerobic reactor displayed well. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010278

Facile method for fabricating boron-doped TiO2 nanotube array with enhanced photoelectrocatalytic properties / Jingyuan Li in Industrial & engineering chemistry research, Vol. 47 n°11 (Juin 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 3804–3808 Titre : Facile method for fabricating boron-doped TiO2 nanotube array with enhanced photoelectrocatalytic properties Type de document : texte imprimé Auteurs : Jingyuan Li, Auteur ; Na Lu, Auteur ; Xie Quan, Auteur ; Shuo Chen, Auteur Année de publication : 2008 Article en page(s) : p. 3804–3808 Note générale : Bibliogr. p. 3807-3808 Langues : Anglais (eng) Mots-clés : TiO2  nanotube  arrays;  Electrodeposition  method;  X-ray  diffraction Résumé : Highly ordered boron-doped TiO2 nanotube arrays were fabricated via a facile electrodeposition method. X-ray photoelectron spectroscopy (XPS) analysis revealed incorporated B atoms in the lattice of a TiO2 nanotube array. The X-ray diffraction (XRD) spectrum indicated improved crystallinity of boron-doped TiO2 nanotube arrays, relative to undoped TiO2 nanotube arrays. A shift of the absorption edge toward the visible region and a new absorption shoulder (380–510 nm) of boron-doped TiO2 nanotube arrays were observed via diffuse reflectance spectroscopy (DRS). In photoelectrochemical measurements, under either ultraviolet (UV) or visible-light irradiation, the photocurrent conversion efficiency was enhanced because of boron doping. The photoelectrocatalysis of phenol under simulated solar irradiation was performed using boron-doped or undoped TiO2 nanotube arrays, and the kinetic constant of a boron-doped TiO2 nanotube array photoelectrode was increased by ca. 28%, compared to that of an undoped TiO2 nanotube array photoelectrode. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie0712028 [article] Facile method for fabricating boron-doped TiO2 nanotube array with enhanced photoelectrocatalytic properties [texte imprimé] / Jingyuan Li, Auteur ; Na Lu, Auteur ; Xie Quan, Auteur ; Shuo Chen, Auteur . - 2008 . - p. 3804–3808. Bibliogr. p. 3807-3808 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 3804–3808 Mots-clés : TiO2  nanotube  arrays;  Electrodeposition  method;  X-ray  diffraction Résumé : Highly ordered boron-doped TiO2 nanotube arrays were fabricated via a facile electrodeposition method. X-ray photoelectron spectroscopy (XPS) analysis revealed incorporated B atoms in the lattice of a TiO2 nanotube array. The X-ray diffraction (XRD) spectrum indicated improved crystallinity of boron-doped TiO2 nanotube arrays, relative to undoped TiO2 nanotube arrays. A shift of the absorption edge toward the visible region and a new absorption shoulder (380–510 nm) of boron-doped TiO2 nanotube arrays were observed via diffuse reflectance spectroscopy (DRS). In photoelectrochemical measurements, under either ultraviolet (UV) or visible-light irradiation, the photocurrent conversion efficiency was enhanced because of boron doping. The photoelectrocatalysis of phenol under simulated solar irradiation was performed using boron-doped or undoped TiO2 nanotube arrays, and the kinetic constant of a boron-doped TiO2 nanotube array photoelectrode was increased by ca. 28%, compared to that of an undoped TiO2 nanotube array photoelectrode. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie0712028

Improvement of water -, sulfur dioxide -, and dust - resistance in selective catalytic reduction of NOx with NH3 using a wire - mesh honeycomb catalyst / Yun Shu in Industrial & engineering chemistry research, Vol. 51 N° 23 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 23 (Juin 2012) . - pp. 7867-7873 Titre : Improvement of water -, sulfur dioxide -, and dust - resistance in selective catalytic reduction of NOx with NH3 using a wire - mesh honeycomb catalyst Type de document : texte imprimé Auteurs : Yun Shu, Auteur ; Hong Sun, Auteur ; Xie Quan, Auteur Année de publication : 2012 Article en page(s) : pp. 7867-7873 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalyst  Honeycomb  structure  Wire  Selective  catalytic  reduction  Dust  Sulfur  dioxide Résumé : A novel V2O5/WO3/TiO2/Al2O3/wire-mesh honeycomb (WMH) catalyst was prepared for selective catalytic reduction (SCR) of NOx with NH3. The resistances to H2O, SO2, and dust were investigated for the WMH catalyst, which were compared with those for ceramic honeycomb (CH) catalysts. The results showed that the WMH catalyst kept above 95% NOx conversion in the broad temperature window (250―425 °C) and provided nearly 92% NOx conversion during H2O and SO2 durability test, which might be attributed to the unique three-dimensional structure. Furthermore, the WMH catalyst could provide nearly 90% NOx conversion during 40 h dust exposure experiment owing to the little dust deposition of 2.9 g/m2, whereas the amount of dust deposited on the CH catalyst with the same cell density reached 6.7 g/m2, which resulted in a decrease of the NOx conversion from 72% to 58%. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25990300 [article] Improvement of water -, sulfur dioxide -, and dust - resistance in selective catalytic reduction of NOx with NH3 using a wire - mesh honeycomb catalyst [texte imprimé] / Yun Shu, Auteur ; Hong Sun, Auteur ; Xie Quan, Auteur . - 2012 . - pp. 7867-7873. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 23 (Juin 2012) . - pp. 7867-7873 Mots-clés : Catalyst  Honeycomb  structure  Wire  Selective  catalytic  reduction  Dust  Sulfur  dioxide Résumé : A novel V2O5/WO3/TiO2/Al2O3/wire-mesh honeycomb (WMH) catalyst was prepared for selective catalytic reduction (SCR) of NOx with NH3. The resistances to H2O, SO2, and dust were investigated for the WMH catalyst, which were compared with those for ceramic honeycomb (CH) catalysts. The results showed that the WMH catalyst kept above 95% NOx conversion in the broad temperature window (250―425 °C) and provided nearly 92% NOx conversion during H2O and SO2 durability test, which might be attributed to the unique three-dimensional structure. Furthermore, the WMH catalyst could provide nearly 90% NOx conversion during 40 h dust exposure experiment owing to the little dust deposition of 2.9 g/m2, whereas the amount of dust deposited on the CH catalyst with the same cell density reached 6.7 g/m2, which resulted in a decrease of the NOx conversion from 72% to 58%. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25990300