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Preparation and characterization of carbon membranes derived from poly(phthalazinone ether sulfone) for gas separation / Bing Zhang in Industrial & engineering chemistry research, Vol. 48 N° 6 (Mars 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 2886–2890 Titre : Preparation and characterization of carbon membranes derived from poly(phthalazinone ether sulfone) for gas separation Type de document : texte imprimé Auteurs : Bing Zhang, Auteur ; Guoliang Shen, Auteur ; Yonghong Wu, Auteur Année de publication : 2009 Article en page(s) : pp. 2886–2890 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Poly(phthalazinone  ether  sulfone)  Carbon  membranes  X-ray  diffraction Résumé : A new polymeric precursor, poly(phthalazinone ether sulfone) (PPES), was used as precursor to prepare carbon membranes via stabilization and pyrolysis. The thermal stability of PPES was determined by thermogravimetry. The evolution of functional groups of membranes was monitored by ATR-FTIR during the formation process of carbon membranes. The carbon structure of the resultant carbon membranes was analyzed by X-ray diffraction technology. The gas permeation property of carbon membranes was tested by pure gases, H2, CO2, O2, and N2. The results show that PPES is a highly thermally stable polymer with the char yield of 38.2 wt % at 700 °C in nitrogen. The functional groups of PPES gradually disappeared by forming a graphite-like structure in the membrane matrix during pyrolysis. At the test condition of 0.1 MPa and 30 °C, the gas permeabilities of H2, CO2, O2, and N2 for carbon membranes prepared at the stabilization and pyrolytic temperature of 440 and 650 °C are 610.13, 439.90, 146.98, and 26.95 barrer (1 barrer = 10−10 cm3 (STP) cm/(cm2 s cmHg) = 3.35 × 10−16 mol m/(m2 s Pa)), together with the selectivities of gas pairs H2/N2, CO2/N2, and O2/N2 of 22.6, 16.3, and 5.5, respectively. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8013583 [article] Preparation and characterization of carbon membranes derived from poly(phthalazinone ether sulfone) for gas separation [texte imprimé] / Bing Zhang, Auteur ; Guoliang Shen, Auteur ; Yonghong Wu, Auteur . - 2009 . - pp. 2886–2890. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 2886–2890 Mots-clés : Poly(phthalazinone  ether  sulfone)  Carbon  membranes  X-ray  diffraction Résumé : A new polymeric precursor, poly(phthalazinone ether sulfone) (PPES), was used as precursor to prepare carbon membranes via stabilization and pyrolysis. The thermal stability of PPES was determined by thermogravimetry. The evolution of functional groups of membranes was monitored by ATR-FTIR during the formation process of carbon membranes. The carbon structure of the resultant carbon membranes was analyzed by X-ray diffraction technology. The gas permeation property of carbon membranes was tested by pure gases, H2, CO2, O2, and N2. The results show that PPES is a highly thermally stable polymer with the char yield of 38.2 wt % at 700 °C in nitrogen. The functional groups of PPES gradually disappeared by forming a graphite-like structure in the membrane matrix during pyrolysis. At the test condition of 0.1 MPa and 30 °C, the gas permeabilities of H2, CO2, O2, and N2 for carbon membranes prepared at the stabilization and pyrolytic temperature of 440 and 650 °C are 610.13, 439.90, 146.98, and 26.95 barrer (1 barrer = 10−10 cm3 (STP) cm/(cm2 s cmHg) = 3.35 × 10−16 mol m/(m2 s Pa)), together with the selectivities of gas pairs H2/N2, CO2/N2, and O2/N2 of 22.6, 16.3, and 5.5, respectively. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8013583

Preparation and characterization of silane coupling agent modified halloysite for Cr(VI) removal / Peng Luo in Industrial & engineering chemistry research, Vol. 50 N° 17 (Septembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 17 (Septembre 2011) . - pp. 10246-10252 Titre : Preparation and characterization of silane coupling agent modified halloysite for Cr(VI) removal Type de document : texte imprimé Auteurs : Peng Luo, Auteur ; Jiang-shan Zhang, Auteur ; Bing Zhang, Auteur Année de publication : 2011 Article en page(s) : pp. 10246-10252 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Coupling  agent  Preparation Résumé : Natural halloysite nanotubes (HNTs) were modified with a silane coupling agent, N-β-aminoethyl-γ-aminopropyl trimethoxysilane (KH-792), to form a new adsorbent for Cr(VI) removal. The as-prepared product was characterized by FTIR spectroscopy, TGA, TEM, and specific surface analysis. The results showed that KH-792 was successfully grafted onto the halloysite surface. Modified HNTs exhibited a rapid adsorption rate for Cr(VI) and approached 95% of the maximum adsorption capacity within 5 min. The effects of initial Cr(VI) concentration, temperature, pH, and ionic strength on the adsorption capacity were investigated in batch experiments. The results showed that low temperature was favorable to improve adsorption efficiency, and the adsorption capacity decreased significantly with the increase of pH and ionic strength. The optimum pH was found to be 3-5. The main adsorption mechanism was considered to be electrostatic interaction between protonated amino groups on the adsorbent surface and negatively charged Cr(VI). The results above confirmed that modified HNTs had the potential to be utilized as a low-cost and relatively effective adsorbent for Cr(VI) removal. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24483668 [article] Preparation and characterization of silane coupling agent modified halloysite for Cr(VI) removal [texte imprimé] / Peng Luo, Auteur ; Jiang-shan Zhang, Auteur ; Bing Zhang, Auteur . - 2011 . - pp. 10246-10252. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 17 (Septembre 2011) . - pp. 10246-10252 Mots-clés : Coupling  agent  Preparation Résumé : Natural halloysite nanotubes (HNTs) were modified with a silane coupling agent, N-β-aminoethyl-γ-aminopropyl trimethoxysilane (KH-792), to form a new adsorbent for Cr(VI) removal. The as-prepared product was characterized by FTIR spectroscopy, TGA, TEM, and specific surface analysis. The results showed that KH-792 was successfully grafted onto the halloysite surface. Modified HNTs exhibited a rapid adsorption rate for Cr(VI) and approached 95% of the maximum adsorption capacity within 5 min. The effects of initial Cr(VI) concentration, temperature, pH, and ionic strength on the adsorption capacity were investigated in batch experiments. The results showed that low temperature was favorable to improve adsorption efficiency, and the adsorption capacity decreased significantly with the increase of pH and ionic strength. The optimum pH was found to be 3-5. The main adsorption mechanism was considered to be electrostatic interaction between protonated amino groups on the adsorbent surface and negatively charged Cr(VI). The results above confirmed that modified HNTs had the potential to be utilized as a low-cost and relatively effective adsorbent for Cr(VI) removal. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24483668