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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

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) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 20 (Octobre 2009) . - pp. 9346–9349 Titre : Removal of thiophene from coking benzene over SO42−/Fe2O3 solid acid under mild conditions Type de document : texte imprimé Auteurs : Zhanjiang Kang, Auteur ; Hongzhu Ma, Auteur ; Bo Wang, Auteur Année de publication : 2010 Article en page(s) : pp. 9346–9349 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Thiophene  DesulfurizationSolid  superacid Résumé : Desulfurization of thiophene in coking benzene with n-butanol as an alkylating agent over SO42−/Fe2O3 solid superacid at 353 K and atmospheric pressure was investigated. The acidity of the catalyst was measured by temperature-programmed desorption (TPD) of ammonia, and the result confirms that the SO42−/Fe2O3 catalyst has a high acid strength. The sample after reaction was detected by gas chromatography−mass spectrometry (GC-MS), and the results show that thiophene has been removed completely. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901075t [article] Removal of thiophene from coking benzene over SO42−/Fe2O3 solid acid under mild conditions [texte imprimé] / Zhanjiang Kang, Auteur ; Hongzhu Ma, Auteur ; Bo Wang, Auteur . - 2010 . - pp. 9346–9349. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 20 (Octobre 2009) . - pp. 9346–9349 Mots-clés : Thiophene  DesulfurizationSolid  superacid Résumé : Desulfurization of thiophene in coking benzene with n-butanol as an alkylating agent over SO42−/Fe2O3 solid superacid at 353 K and atmospheric pressure was investigated. The acidity of the catalyst was measured by temperature-programmed desorption (TPD) of ammonia, and the result confirms that the SO42−/Fe2O3 catalyst has a high acid strength. The sample after reaction was detected by gas chromatography−mass spectrometry (GC-MS), and the results show that thiophene has been removed completely. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901075t