Effect of adsorbed water and surface hydroxyls on the hydrolysis of VX, GD, and HD on titania materials / George W. Wagner in Industrial & engineering chemistry research, Vol. 51 N° 9 (Mars 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3598–3603 Titre : Effect of adsorbed water and surface hydroxyls on the hydrolysis of VX, GD, and HD on titania materials : The development of self - decontaminating paints Type de document : texte imprimé Auteurs : George W. Wagner, Auteur ; Gregory W. Peterson, Auteur ; John J. Mahle, Auteur Année de publication : 2012 Article en page(s) : pp. 3598–3603 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Adsorbed water Hydrolysis Résumé : Titania materials such as anatase (TiO2), nanotubular titania (NTT), and nanocrystalline titania (nTiO2) exhibit extremely short half-lives for VX, provided adequate surface-adsorbed water is present. The effect of coadsorbed water on the hydrolytic activity of these materials toward VX, GD, and HD was assessed to select the most promising candidate for study in self-decontaminating paints and coatings. The best candidate is nTiO2, primarily chosen for its extremely short VX half-life at quite high water-content. For the most part, imbedding nTiO2 into various coatings negatively impacts its reactivity. A notable exception is observed for the case of HD and nTiO2/Wax (a paint simulant), where a somewhat shorter half-life is observed compared to the nascent nTiO2 powder. However, encrusting a painted surface with nTiO2 powder, leaving it partly exposed rather than wholly imbedded, results in improved reactivity. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202063p [article] Effect of adsorbed water and surface hydroxyls on the hydrolysis of VX, GD, and HD on titania materials : The development of self - decontaminating paints [texte imprimé] / George W. Wagner, Auteur ; Gregory W. Peterson, Auteur ; John J. Mahle, Auteur . - 2012 . - pp. 3598–3603. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3598–3603 Mots-clés : Adsorbed water Hydrolysis Résumé : Titania materials such as anatase (TiO2), nanotubular titania (NTT), and nanocrystalline titania (nTiO2) exhibit extremely short half-lives for VX, provided adequate surface-adsorbed water is present. The effect of coadsorbed water on the hydrolytic activity of these materials toward VX, GD, and HD was assessed to select the most promising candidate for study in self-decontaminating paints and coatings. The best candidate is nTiO2, primarily chosen for its extremely short VX half-life at quite high water-content. For the most part, imbedding nTiO2 into various coatings negatively impacts its reactivity. A notable exception is observed for the case of HD and nTiO2/Wax (a paint simulant), where a somewhat shorter half-life is observed compared to the nascent nTiO2 powder. However, encrusting a painted surface with nTiO2 powder, leaving it partly exposed rather than wholly imbedded, results in improved reactivity. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202063p

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Enhanced cyanogen chloride removal by the reactive zirconium hydroxide substrate / Gregory W. Peterson in Industrial & engineering chemistry research, Vol. 49 N° 22 (Novembre 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11182–11187 Titre : Enhanced cyanogen chloride removal by the reactive zirconium hydroxide substrate Type de document : texte imprimé Auteurs : Gregory W. Peterson, Auteur ; George W. Wagner, Auteur ; Jennifer H. Keller, Auteur Année de publication : 2011 Article en page(s) : pp. 11182–11187 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Microporous Zirconium Hydroxide Résumé : A novel microporous sorbent consisting of zirconium hydroxide impregnated with triethylenediamine (TEDA) was evaluated for the removal of cyanogen chloride. Breakthrough data were collected on packed beds, illustrating the efficacious nature of TEDA and the enhanced cyanogen chloride removal from the basic zirconium hydroxide structure. NMR and XPS analyses revealed the fate of cyanogen chloride, with inorganic chloride byproducts deposited on the surface of the material and polymerized urea condensates physically adsorbed in the pore structure. The zirconium hydroxide media were found to provide significantly enhanced removal capabilities as compared to traditionally impregnated activated carbons, allowing for the development of respirators with reduced encumbrance. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101204e [article] Enhanced cyanogen chloride removal by the reactive zirconium hydroxide substrate [texte imprimé] / Gregory W. Peterson, Auteur ; George W. Wagner, Auteur ; Jennifer H. Keller, Auteur . - 2011 . - pp. 11182–11187. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11182–11187 Mots-clés : Microporous Zirconium Hydroxide Résumé : A novel microporous sorbent consisting of zirconium hydroxide impregnated with triethylenediamine (TEDA) was evaluated for the removal of cyanogen chloride. Breakthrough data were collected on packed beds, illustrating the efficacious nature of TEDA and the enhanced cyanogen chloride removal from the basic zirconium hydroxide structure. NMR and XPS analyses revealed the fate of cyanogen chloride, with inorganic chloride byproducts deposited on the surface of the material and polymerized urea condensates physically adsorbed in the pore structure. The zirconium hydroxide media were found to provide significantly enhanced removal capabilities as compared to traditionally impregnated activated carbons, allowing for the development of respirators with reduced encumbrance. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101204e

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Zirconium hydroxide as a reactive substrate for the removal of sulfur dioxide / Gregory W. Peterson in Industrial & engineering chemistry research, Vol. 48 N°4 (Février 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - pp. 1694–1698 Titre : Zirconium hydroxide as a reactive substrate for the removal of sulfur dioxide Type de document : texte imprimé Auteurs : Gregory W. Peterson, Auteur ; Christopher J. Karwacki, Auteur ; William B. Feaver, Auteur Année de publication : 2009 Article en page(s) : pp. 1694–1698 Note générale : Chemical enineering Langues : Anglais (eng) Mots-clés : Zirconium hydroxide Sulfur dioxide Temperature-programmed desorption X-ray photoelectron spectroscopy Résumé : Zirconium hydroxide [Zr(OH)4], with a surface area of 365 m2/g, was evaluated for its ability to remove SO2 from streams of air at room temperature. The SO2 removal capacity of Zr(OH)4 was ∼90 mg SO2 removed per cm3 bed volume, which is almost an order of magnitude greater than the value achieved for activated carbon and is more than twice the value achieved for activated carbon impregnated with 10% CuO. Temperature-programmed desorption results indicate that SO2 is strongly retained by Zr(OH)4. X-ray photoelectron spectroscopy results reveals the presence of sulfite (SO32−) species following reaction exposure, which suggests the formation of zirconium sulfite. Although the SO2 removal capacity (volume basis) of Zr(OH)4 is high, relative to that of impregnated activated carbon, only 10% of the stoichiometric hydroxyl groups are able to contribute to the removal of SO2. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801403h [article] Zirconium hydroxide as a reactive substrate for the removal of sulfur dioxide [texte imprimé] / Gregory W. Peterson, Auteur ; Christopher J. Karwacki, Auteur ; William B. Feaver, Auteur . - 2009 . - pp. 1694–1698. Chemical enineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - pp. 1694–1698 Mots-clés : Zirconium hydroxide Sulfur dioxide Temperature-programmed desorption X-ray photoelectron spectroscopy Résumé : Zirconium hydroxide [Zr(OH)4], with a surface area of 365 m2/g, was evaluated for its ability to remove SO2 from streams of air at room temperature. The SO2 removal capacity of Zr(OH)4 was ∼90 mg SO2 removed per cm3 bed volume, which is almost an order of magnitude greater than the value achieved for activated carbon and is more than twice the value achieved for activated carbon impregnated with 10% CuO. Temperature-programmed desorption results indicate that SO2 is strongly retained by Zr(OH)4. X-ray photoelectron spectroscopy results reveals the presence of sulfite (SO32−) species following reaction exposure, which suggests the formation of zirconium sulfite. Although the SO2 removal capacity (volume basis) of Zr(OH)4 is high, relative to that of impregnated activated carbon, only 10% of the stoichiometric hydroxyl groups are able to contribute to the removal of SO2. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801403h

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