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Acetone influence on glass transition of poly(methyl methacrylate) and polystyrene in compressed carbon dioxide / Jun He in Industrial & engineering chemistry research, Vol. 48 N° 10 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 5093–5097 Titre : Acetone influence on glass transition of poly(methyl methacrylate) and polystyrene in compressed carbon dioxide Type de document : texte imprimé Auteurs : Jun He, Auteur ; Bo Wang, Auteur Année de publication : 2009 Article en page(s) : pp. 5093–5097 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Poly(methyl  methacrylate)  Polystyrene  Compressed  gaseous  acetone/carbon  dioxide  Glass  transition  pressure Résumé : In this work, the glass transitions of poly(methyl methacrylate) and polystyrene in compressed gaseous acetone/carbon dioxide were measured by an in situ creep compliance method at pressures lower than 7.0 MPa and at 318−338 K. When a small amount of acetone (x = 0.01−0.02) was added to a polymer-compressed carbon dioxide system, the glass transition pressure of polymer was further depressed by 1.0−4.0 MPa. The observed glass transition pressure depression increased with the acetone concentration in carbon dioxide and decreased with the temperature rise. A simple model was used to estimate the glass transition temperature depressions for the polymers in compressed gaseous acetone/carbon dioxide solution. The calculated results were in good agreement with the determined ones, except for the retrograde vitrification region. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801949g [article] Acetone influence on glass transition of poly(methyl methacrylate) and polystyrene in compressed carbon dioxide [texte imprimé] / Jun He, Auteur ; Bo Wang, Auteur . - 2009 . - pp. 5093–5097. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 5093–5097 Mots-clés : Poly(methyl  methacrylate)  Polystyrene  Compressed  gaseous  acetone/carbon  dioxide  Glass  transition  pressure Résumé : In this work, the glass transitions of poly(methyl methacrylate) and polystyrene in compressed gaseous acetone/carbon dioxide were measured by an in situ creep compliance method at pressures lower than 7.0 MPa and at 318−338 K. When a small amount of acetone (x = 0.01−0.02) was added to a polymer-compressed carbon dioxide system, the glass transition pressure of polymer was further depressed by 1.0−4.0 MPa. The observed glass transition pressure depression increased with the acetone concentration in carbon dioxide and decreased with the temperature rise. A simple model was used to estimate the glass transition temperature depressions for the polymers in compressed gaseous acetone/carbon dioxide solution. The calculated results were in good agreement with the determined ones, except for the retrograde vitrification region. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801949g

Electrochemical oxidation of refractory organics wastewater and chemical oxygen demand (COD) Removal under Extremely Mild Condition / Bo Wang in Industrial & engineering chemistry research, Vol. 47 n°21 (Novembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8478–8483 Titre : Electrochemical oxidation of refractory organics wastewater and chemical oxygen demand (COD) Removal under Extremely Mild Condition Type de document : texte imprimé Auteurs : Bo Wang, Auteur ; Xin Chang, Auteur ; Hongzhu Ma, Auteur Année de publication : 2008 Article en page(s) : p. 8478–8483 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Wastewater  causes  Pollution Résumé : Coking wastewater causes severe environmental pollution because of its high concentration of organics and other dangerous chemicals, which makes it difficult to reuse by conventional technologies. In this article, we report an investigation of the electrochemical oxidation of coking wastewater at 298 K and 1 atm in the presence of ozone, where the reaction was assisted by potassium permanganate as the catalyst and kaolin as the carrier. The results showed that the refractory organics in wastewater can be effectively removed by this process, and a chemical oxygen demand (COD) removal efficiency of 92.5% was obtained in 80 min at pH 3. Operating parameters such as the current density, initial pH, and amount of catalyst were investigated. Catalyst lifetime was also tested, and the results showed that catalyst activity still remained even after the catalyst had been used three times. The impact of the treated wastewater on chlorophyll was also investigated, with a steady amount of chlorophyll indicating that the treated wastewater could be applied to irrigation. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800826v [article] Electrochemical oxidation of refractory organics wastewater and chemical oxygen demand (COD) Removal under Extremely Mild Condition [texte imprimé] / Bo Wang, Auteur ; Xin Chang, Auteur ; Hongzhu Ma, Auteur . - 2008 . - p. 8478–8483. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8478–8483 Mots-clés : Wastewater  causes  Pollution Résumé : Coking wastewater causes severe environmental pollution because of its high concentration of organics and other dangerous chemicals, which makes it difficult to reuse by conventional technologies. In this article, we report an investigation of the electrochemical oxidation of coking wastewater at 298 K and 1 atm in the presence of ozone, where the reaction was assisted by potassium permanganate as the catalyst and kaolin as the carrier. The results showed that the refractory organics in wastewater can be effectively removed by this process, and a chemical oxygen demand (COD) removal efficiency of 92.5% was obtained in 80 min at pH 3. Operating parameters such as the current density, initial pH, and amount of catalyst were investigated. Catalyst lifetime was also tested, and the results showed that catalyst activity still remained even after the catalyst had been used three times. The impact of the treated wastewater on chlorophyll was also investigated, with a steady amount of chlorophyll indicating that the treated wastewater could be applied to irrigation. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800826v

A mild simple method for liquid-phase selective catalytic oxidation of toluene with ozone over CeO2 promoted sulfated TiO2 / Bo Wang in Industrial & engineering chemistry research, Vol. 48 N°1 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - P. 440-445 Titre : A mild simple method for liquid-phase selective catalytic oxidation of toluene with ozone over CeO2 promoted sulfated TiO2 Type de document : texte imprimé Auteurs : Bo Wang, Editeur scientifique ; Wei Mao, Editeur scientifique ; Hongzhu Ma, Editeur scientifique Année de publication : 2009 Article en page(s) : P. 440-445 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Oxidation  of  toluene  Ozone  ozone−air Résumé : A new clean catalytic process for liquid phase selective oxidation of toluene has been carried out on CeO2 promoted sulfated TiO2 (SO42−/TiO2−CeO2, abbreviated as STC) catalyst with ozone−air at ambient temperature and atmospheric pressure. Neither solvent nor promoters are needed in the reaction system. STC were found to exhibit good catalytic reactivity for the selective oxidation of toluene. For comparison, a series of single and complex oxides were also investigated including pure TiO2, SO42−/TiO2 (abbreviated as ST). The total conversion and yield to the selective products exhibited by STC were superior to those catalysts exhibited in the presence of ozone. The highest conversion of toluene was found to be 9.7% with 77% selectivity to benzaldehyde and benzyl alcohol on the STC. The anatase phase was found to be dominating in the STC by means of X-ray diffraction. By utilization of the N2 adsorption method, it was detected that the Brunauer−Emmett−Teller surface area of STC was higher than other samples. Other techniques such as scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and energy dispersive X-ray spectroscopy were also employed to characterize the property of catalysts. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800725h [article] A mild simple method for liquid-phase selective catalytic oxidation of toluene with ozone over CeO2 promoted sulfated TiO2 [texte imprimé] / Bo Wang, Editeur scientifique ; Wei Mao, Editeur scientifique ; Hongzhu Ma, Editeur scientifique . - 2009 . - P. 440-445. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - P. 440-445 Mots-clés : Oxidation  of  toluene  Ozone  ozone−air Résumé : A new clean catalytic process for liquid phase selective oxidation of toluene has been carried out on CeO2 promoted sulfated TiO2 (SO42−/TiO2−CeO2, abbreviated as STC) catalyst with ozone−air at ambient temperature and atmospheric pressure. Neither solvent nor promoters are needed in the reaction system. STC were found to exhibit good catalytic reactivity for the selective oxidation of toluene. For comparison, a series of single and complex oxides were also investigated including pure TiO2, SO42−/TiO2 (abbreviated as ST). The total conversion and yield to the selective products exhibited by STC were superior to those catalysts exhibited in the presence of ozone. The highest conversion of toluene was found to be 9.7% with 77% selectivity to benzaldehyde and benzyl alcohol on the STC. The anatase phase was found to be dominating in the STC by means of X-ray diffraction. By utilization of the N2 adsorption method, it was detected that the Brunauer−Emmett−Teller surface area of STC was higher than other samples. Other techniques such as scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and energy dispersive X-ray spectroscopy were also employed to characterize the property of catalysts. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800725h

Partition coefficients of methyl methacrylate and acetone between polymer and compressed carbon dioxide phases by an in situ infrared spectroscopy method / Jun He in Industrial & engineering chemistry research, Vol. 48 N° 15 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7354–7358 Titre : Partition coefficients of methyl methacrylate and acetone between polymer and compressed carbon dioxide phases by an in situ infrared spectroscopy method Type de document : texte imprimé Auteurs : Jun He, Auteur ; Bo Wang, Auteur Année de publication : 2009 Article en page(s) : pp. 7354–7358 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Methyl  methacrylate  Acetone  Polymer  gaseous  carbon  dioxide  phase  Compressed  gaseous  carbon  dioxide  phase  Partition  coefficients  Fourier  transform  infrared  spectroscopy  method Résumé : Partition coefficients of methyl methacrylate and acetone between some polymer and compressed gaseous carbon dioxide phases were determined by an in situ Fourier transform infrared (FTIR) spectroscopy method with a special designed high pressure IR cell at 318.2 K and 2.0−7.0 MPa. At the same temperature and pressure, the partition coefficient for methyl methacrylate was higher than that for acetone between the same polymer and subcritical carbon dioxide. For most solute/polymer/CO2 systems, the partition coefficient of solute between the polymer and compressed gaseous carbon dioxide decreased with the pressure increase. Only for a methyl methacrylate/poly(methyl methacrylate)/CO2 system, the partiton coefficient was not sensitive to the pressure change at pressures lower than 3.9 MPa. A linear solvation free energy relationship was used to estimate the main tendency of the pressure dependency. With the pressure dependent polarizability−dipolarity parameter of carbon dioxide, the calculated results were in accord with some experimental results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801824y [article] Partition coefficients of methyl methacrylate and acetone between polymer and compressed carbon dioxide phases by an in situ infrared spectroscopy method [texte imprimé] / Jun He, Auteur ; Bo Wang, Auteur . - 2009 . - pp. 7354–7358. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7354–7358 Mots-clés : Methyl  methacrylate  Acetone  Polymer  gaseous  carbon  dioxide  phase  Compressed  gaseous  carbon  dioxide  phase  Partition  coefficients  Fourier  transform  infrared  spectroscopy  method Résumé : Partition coefficients of methyl methacrylate and acetone between some polymer and compressed gaseous carbon dioxide phases were determined by an in situ Fourier transform infrared (FTIR) spectroscopy method with a special designed high pressure IR cell at 318.2 K and 2.0−7.0 MPa. At the same temperature and pressure, the partition coefficient for methyl methacrylate was higher than that for acetone between the same polymer and subcritical carbon dioxide. For most solute/polymer/CO2 systems, the partition coefficient of solute between the polymer and compressed gaseous carbon dioxide decreased with the pressure increase. Only for a methyl methacrylate/poly(methyl methacrylate)/CO2 system, the partiton coefficient was not sensitive to the pressure change at pressures lower than 3.9 MPa. A linear solvation free energy relationship was used to estimate the main tendency of the pressure dependency. With the pressure dependent polarizability−dipolarity parameter of carbon dioxide, the calculated results were in accord with some experimental results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801824y

Removal of chromium(VI) from aqueous solutions using polyaniline doped with sulfuric acid / Runhu Zhang in Industrial & engineering chemistry research, Vol. 49 N° 20 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 9998-10004 Titre : Removal of chromium(VI) from aqueous solutions using polyaniline doped with sulfuric acid Type de document : texte imprimé Auteurs : Runhu Zhang, Auteur ; Hongzhu Ma, Auteur ; Bo Wang, Auteur Année de publication : 2011 Article en page(s) : pp. 9998-10004 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Aqueous  solution Résumé : A type of polyaniline was synthesized and its Cr (VI) removal potential was investigated in this work. The kinetics study, adsorption isotherm, pH effect, and thermodynamic study were examined in batch experiments. Adsorption data for Cr (VI) uptake by polyaniline were analyzed according to Langmuir and Freundlich adsorption models. Thermodynamic parameters for the adsorption system were determinated at 293 K, 303 K, and 313 K (ΔH° = 23.87 kJ mol-1; ΔG° = -10.76 to -13.13 kJ mol-1 and ΔS° = 118.20 J K-1 mol-1). The positive values of both ΔH° and ΔS° suggest an endothermic reaction, increasing in randomness at the solid—liquid interface during the adsorption process. ΔG° values obtained were negative, indicated that the adsorption of the Cr (VI) ion on the surface of polyaniline was a spontaneous adsorption process. The kinetics process can be described by a pseudosecond-order rate equation very well. The Cr (VI) adsorption capacity tended to increase with a decrease of pH. The maximum uptake of Cr (VI) was 95.79 mg g-1. These results show that the polyaniline doped with sulfuric acid could be considered as a potential adsorbent for chromium hexavalent ions in aqueous solutions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23325821 [article] Removal of chromium(VI) from aqueous solutions using polyaniline doped with sulfuric acid [texte imprimé] / Runhu Zhang, Auteur ; Hongzhu Ma, Auteur ; Bo Wang, Auteur . - 2011 . - pp. 9998-10004. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 9998-10004 Mots-clés : Aqueous  solution Résumé : A type of polyaniline was synthesized and its Cr (VI) removal potential was investigated in this work. The kinetics study, adsorption isotherm, pH effect, and thermodynamic study were examined in batch experiments. Adsorption data for Cr (VI) uptake by polyaniline were analyzed according to Langmuir and Freundlich adsorption models. Thermodynamic parameters for the adsorption system were determinated at 293 K, 303 K, and 313 K (ΔH° = 23.87 kJ mol-1; ΔG° = -10.76 to -13.13 kJ mol-1 and ΔS° = 118.20 J K-1 mol-1). The positive values of both ΔH° and ΔS° suggest an endothermic reaction, increasing in randomness at the solid—liquid interface during the adsorption process. ΔG° values obtained were negative, indicated that the adsorption of the Cr (VI) ion on the surface of polyaniline was a spontaneous adsorption process. The kinetics process can be described by a pseudosecond-order rate equation very well. The Cr (VI) adsorption capacity tended to increase with a decrease of pH. The maximum uptake of Cr (VI) was 95.79 mg g-1. These results show that the polyaniline doped with sulfuric acid could be considered as a potential adsorbent for chromium hexavalent ions in aqueous solutions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23325821

Removal of thiophene from coking benzene over SO42−/Fe2O3 solid acid under mild conditions / Zhanjiang Kang in Industrial & engineering chemistry research, Vol. 48 N° 20 (Octobre 2009) 

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Similarity solution of dam-break flow on horizontal frictionless channel / Yunliang Chen in Journal of hydraulic research, Vol. 49 N° 3 (Mai/Juin 2011) 

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The temperature, cosolvent, and blending effects on the partitions between polymer and compressed carbon dioxide / Jun He in Industrial & engineering chemistry research, Vol. 48 N° 15 (Août 2009) 

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