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Development of a photocatalytic wet scrubbing process for gaseous odor treatment / Tong-xu Liu in Industrial & engineering chemistry research, Vol. 49 N° 8 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp.3617–3622 Titre : Development of a photocatalytic wet scrubbing process for gaseous odor treatment Type de document : texte imprimé Auteurs : Tong-xu Liu, Auteur ; Xiang-Song Li, Auteur ; Fang-bai Li, Auteur Année de publication : 2010 Article en page(s) : pp.3617–3622 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Photocatalytic  Wet  Scrubbing  Gaseous  Odor Résumé : In this study, methyl mercaptan (CH3SH) gas was used to prepare synthetic odorous gases, and a photocatalytic wet scrubbing process as a new approach was developed for treating such odorous gases. In this process, gaseous CH3SH is first absorbed by the solution, and the dissolved CH3SH/CH3S− is then adsorbed onto the solid surface of TiO2 particles and oxidized under UV illumination in the aqueous phase. Experiments were conducted under different reaction conditions of CH3SH loading, TiO2 dosage, and pH. The reaction kinetics of CH3SH reduction indicates that the pH of the reaction solution greatly influences the rate of CH3SH absorption by the solution. At pH < 11.5, CH3SH absorption by the solution is the rate-determining step (RDS), whereas at pH > 11.5, the photoreaction becomes the RDS in such a system. The experiments demonstrated that the efficiency of CH3SH degradation determined by two methyl mercaptan sensors and the ratio of odor removal determined by olfactometry measurements can be well maintained at high levels of >95% for a CH3SH loading of 10 g m−3 h−1. The main intermediates and final products from CH3SH degradation were identified by GC/MS and ion chromatography, and a pathway for CH3SH degradation with three routes is proposed and discussed. Odor samples to simulate real foul gases were also prepared and treated with this new process. An electronic nose technique was applied to indentify the patterns of odor characteristics before and after treatment. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1000295?prevSearch=Development%2Bof%2Ba%2B [...] [article] Development of a photocatalytic wet scrubbing process for gaseous odor treatment [texte imprimé] / Tong-xu Liu, Auteur ; Xiang-Song Li, Auteur ; Fang-bai Li, Auteur . - 2010 . - pp.3617–3622. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp.3617–3622 Mots-clés : Photocatalytic  Wet  Scrubbing  Gaseous  Odor Résumé : In this study, methyl mercaptan (CH3SH) gas was used to prepare synthetic odorous gases, and a photocatalytic wet scrubbing process as a new approach was developed for treating such odorous gases. In this process, gaseous CH3SH is first absorbed by the solution, and the dissolved CH3SH/CH3S− is then adsorbed onto the solid surface of TiO2 particles and oxidized under UV illumination in the aqueous phase. Experiments were conducted under different reaction conditions of CH3SH loading, TiO2 dosage, and pH. The reaction kinetics of CH3SH reduction indicates that the pH of the reaction solution greatly influences the rate of CH3SH absorption by the solution. At pH < 11.5, CH3SH absorption by the solution is the rate-determining step (RDS), whereas at pH > 11.5, the photoreaction becomes the RDS in such a system. The experiments demonstrated that the efficiency of CH3SH degradation determined by two methyl mercaptan sensors and the ratio of odor removal determined by olfactometry measurements can be well maintained at high levels of >95% for a CH3SH loading of 10 g m−3 h−1. The main intermediates and final products from CH3SH degradation were identified by GC/MS and ion chromatography, and a pathway for CH3SH degradation with three routes is proposed and discussed. Odor samples to simulate real foul gases were also prepared and treated with this new process. An electronic nose technique was applied to indentify the patterns of odor characteristics before and after treatment. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1000295?prevSearch=Development%2Bof%2Ba%2B [...]

Micro-macro quantification of the internal structure of granular materials / Xia Li in Journal of engineering mechanics, Vol. 135 N° 7 (Juillet 2009) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 135 N° 7 (Juillet 2009) . - pp. 641-656 Titre : Micro-macro quantification of the internal structure of granular materials Type de document : texte imprimé Auteurs : Xia Li, Auteur ; Xiang-Song Li, Auteur Article en page(s) : pp. 641-656 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Granular  materials  Microstructures  Stress  strain  relations  Anisotropy  Deformation. Résumé : We have attempted a multiscale quantification of the internal structure of granular materials. The internal structure of granular materials, i.e., the geometrical information on granular particles and their spatial arrangement, was described mathematically on the particle scale using Voronoi–Delaunay tessellations. These tessellations were further modified into two cell systems: a solid cell system and a void cell system, with the internal supporting structure properly reflected. By doing so, the two cell systems were geometrically and physically significant. Taking solid/void cells as the microscopic basic elements, the behavior of granular materials was expressed as the volumetric average of the microcell behavior. Macroscopically, the internal structure could be characterized by the statistical measures from the geometry of the microcells. Our approach was used to investigate the anisotropic behavior of granular materials. A study on the void cells explains how the spatial arrangement affects the strength and dilatancy of granular materials. A new anisotropic fabric tensor was defined based on the void cell anisotropy. The correlation between the anisotropic fabric tensor and the macro behavior of granular materials was verified with numerical simulations. The results showed that the new material anisotropic tensor is a more effective definition than the existing ones based on particle orientations and contact normals. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JENMDT&smode=strres [...] [article] Micro-macro quantification of the internal structure of granular materials [texte imprimé] / Xia Li, Auteur ; Xiang-Song Li, Auteur . - pp. 641-656. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 135 N° 7 (Juillet 2009) . - pp. 641-656 Mots-clés : Granular  materials  Microstructures  Stress  strain  relations  Anisotropy  Deformation. Résumé : We have attempted a multiscale quantification of the internal structure of granular materials. The internal structure of granular materials, i.e., the geometrical information on granular particles and their spatial arrangement, was described mathematically on the particle scale using Voronoi–Delaunay tessellations. These tessellations were further modified into two cell systems: a solid cell system and a void cell system, with the internal supporting structure properly reflected. By doing so, the two cell systems were geometrically and physically significant. Taking solid/void cells as the microscopic basic elements, the behavior of granular materials was expressed as the volumetric average of the microcell behavior. Macroscopically, the internal structure could be characterized by the statistical measures from the geometry of the microcells. Our approach was used to investigate the anisotropic behavior of granular materials. A study on the void cells explains how the spatial arrangement affects the strength and dilatancy of granular materials. A new anisotropic fabric tensor was defined based on the void cell anisotropy. The correlation between the anisotropic fabric tensor and the macro behavior of granular materials was verified with numerical simulations. The results showed that the new material anisotropic tensor is a more effective definition than the existing ones based on particle orientations and contact normals. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JENMDT&smode=strres [...]