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Natural organic matter adsorption onto granular activated carbons / Unai Iriarte-Velasco in Industrial & engineering chemistry research, Vol. 47 N°20 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7868-7876 Titre : Natural organic matter adsorption onto granular activated carbons : implications in the molecular weight and disinfection byproducts formation Type de document : texte imprimé Auteurs : Unai Iriarte-Velasco, Auteur ; Jon I. Álvarez-Uriarte, Auteur ; Noemí Chimeno-Alanís, Auteur ; Juan R. Gonzalez-Velasco, Auteur Année de publication : 2008 Article en page(s) : P. 7868-7876 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Carbon  Granular  activated  carbon  (GAC)  Thermogravimetric  analysis  (TGA) Résumé : Adsorption of natural organic matter (NOM) by granular activated carbon (GAC) was studied. Three different carbons of different origin were initially used. The physical properties were studied by means of N2 adsorption. Chemical properties were studied by means of thermogravimetric analysis (TGA), acid−base titrations, and FTIR. Only one of the carbons showed a broad adsorption band in the 1300−1000 cm−1 region in FTIR spectra, which can be assigned to C−O stretching and O−H bending modes of alcoholic, phenolic, and carboxylic groups. Adsorption of NOM was studied by batch adsorption experiments. Uptake of NOM by the different carbons was evaluated by UV absorbance, disinfection byproduct formation potential tests, and HPLC-SEC chromatography. Freundlich equation was used to fit equilibrium data. pHPZC and overall surface basicity were shown to improve the removal of THM precursors. Differences in the molecular weight distribution of the adsorbed material by different carbons were reported. A clear correlation was found between the reduction in the THM formation capacity of sample and the reduction in intensity of a specific peak in SEC chromatograms. Furthermore, THMFP tests showed the existence of some fractions of NOM not adsorbable with activated carbons and undetected by measurement of DOC. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800912y [article] Natural organic matter adsorption onto granular activated carbons : implications in the molecular weight and disinfection byproducts formation [texte imprimé] / Unai Iriarte-Velasco, Auteur ; Jon I. Álvarez-Uriarte, Auteur ; Noemí Chimeno-Alanís, Auteur ; Juan R. Gonzalez-Velasco, Auteur . - 2008 . - P. 7868-7876. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7868-7876 Mots-clés : Carbon  Granular  activated  carbon  (GAC)  Thermogravimetric  analysis  (TGA) Résumé : Adsorption of natural organic matter (NOM) by granular activated carbon (GAC) was studied. Three different carbons of different origin were initially used. The physical properties were studied by means of N2 adsorption. Chemical properties were studied by means of thermogravimetric analysis (TGA), acid−base titrations, and FTIR. Only one of the carbons showed a broad adsorption band in the 1300−1000 cm−1 region in FTIR spectra, which can be assigned to C−O stretching and O−H bending modes of alcoholic, phenolic, and carboxylic groups. Adsorption of NOM was studied by batch adsorption experiments. Uptake of NOM by the different carbons was evaluated by UV absorbance, disinfection byproduct formation potential tests, and HPLC-SEC chromatography. Freundlich equation was used to fit equilibrium data. pHPZC and overall surface basicity were shown to improve the removal of THM precursors. Differences in the molecular weight distribution of the adsorbed material by different carbons were reported. A clear correlation was found between the reduction in the THM formation capacity of sample and the reduction in intensity of a specific peak in SEC chromatograms. Furthermore, THMFP tests showed the existence of some fractions of NOM not adsorbable with activated carbons and undetected by measurement of DOC. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800912y