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Anaerobic Biodegradation of Surfactants – Scientific Review / J. L. Berna in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 6/2007 (12/2007)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 44, N° 6/2007 (12/2007) . - p. 312-347 Titre : Anaerobic Biodegradation of Surfactants – Scientific Review Type de document : texte imprimé Auteurs : J. L. Berna, Auteur ; G. Cassani, Auteur ; C.-D. Hager, Auteur ; N. Rehman, Auteur ; I. Lopez, Auteur ; D. Schowanek, Auteur ; J. Steber, Auteur ; K. Taeger, Auteur ; T. Wind, Auteur Année de publication : 2008 Article en page(s) : p. 312-347 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants -- Biodégradation Tags : Anaerobic  biodegradation  biodegradability  Wastewater  treatment  Screening  tests  Simulation  sediment  Monitoring  data Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The anaerobic biodegradation of surfactants is used as an acceptability criterion in some environmental pieces of legislation (eco-label, risk assessment, etc.), without a proper evaluation of the relevance of such a characteristic. Available screening test methods to assess the anaerobic biodegradation do not simulate the real conditions prevailing in these anaerobic compartments but rather reflect more stringent conditions, due to the high test substance/biomass ratio, possibility of inhibitory effects and limited possibility for adaptation. Therefore positive results are indicative of a similar behaviour under environmental conditions, while a negative result cannot be necessarily interpreted as inherent anaerobic recalcitrance. The majority of surfactants entering the environment will be exposed to and degraded under aerobic conditions, and only less than 20% will potentially reach temporarily anaerobic environmental compartments. In contrast to the well documented adverse effects observed in the absence of aerobic biodegradation, the lack of anaerobic biodegradation does not seem to be correlated with any apparent environmental problem for most compartments after more than 40 years of widely use of such products. The scientific review concluded that anaerobic biodegradability does not have the same environmental relevance as the aerobic one. Anaerobic biodegradability should not, therefore, be used as a pass/fail property for the environmental acceptability of surfactants which are readily biodegradable under aerobic conditions. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3195 [article]

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A comparative analysis between different ether carboxylic acids with respect to wettability and surface topography of abrasively treated polyester fabrics / V. Dutschk in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 6/2007 (12/2007)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 44, N° 6/2007 (12/2007) . - p. 348-355 Titre : A comparative analysis between different ether carboxylic acids with respect to wettability and surface topography of abrasively treated polyester fabrics Type de document : texte imprimé Auteurs : V. Dutschk, Auteur ; S. Myat, Auteur ; J. Märtin ; M. Stolz ; B. Breitzke ; Ch. Cherif ; G. Heinrich Année de publication : 2008 Article en page(s) : p. 348-355 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Ether  carboxylic  acids  Wettability  Surface  topography  Polyester  Woven  and  knitted  fabrics  Abrasive  resistance Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Wetting properties and surface topography of different polyester fabrics have been determined before and after their mechanical abrasion. As protective finishes, different surface active ether carboxylic acids were used. The influence of different weave types of the fabrics – woven and knitted – on their abrasive resistance was revealed. A comparative analysis between different ether carbon acids with respect to wettability of fabrics, surface topography parameters and mechanical treatment by abrasion was done. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3196 [article]

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Interaction of amphoteric collector with silica and hematite surfaces in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 6/2007 (12/2007)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 44, N° 6/2007 (12/2007) . - p. 356-359 Titre : Interaction of amphoteric collector with silica and hematite surfaces Type de document : texte imprimé Année de publication : 2008 Article en page(s) : p. 356-359 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Amphoteric  collector  zeta  potential  electrostatic  interaction  adsorption Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The silica represents the main gangue mineral in iron ore deposits. Different surfactants were used for separation of silica from iron ores. In the current work, an amphoteric collector was used as an alternative for the current reagents. Pure minerals of silica and hematite were used to investigate the mechanism of the amphoteric collector adsorption on both minerals. It was found that the adsorption density of collector was pH dependent. Preferential adsorption of collector was found to be at acidic pH range. The mechanism of collector interaction with the mineral surface was found to proceed via electrostatic interaction. Zeta potential measurements have indicated the possibility of collector adsorption by electrostatic interaction under the conditions where mineral surface and collector are oppositely charged Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3197 [article]

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Self-cleaning by utilization of photocatalytic effects / J Bettenbühl in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 6/2007 (12/2007)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 44, N° 6/2007 (12/2007) . - p. 6360-365 Titre : Self-cleaning by utilization of photocatalytic effects Type de document : texte imprimé Auteurs : J Bettenbühl, Auteur ; B. Proft, Auteur Année de publication : 2008 Article en page(s) : p. 6360-365 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dioxyde de titane Photocatalyse Revêtement auto-nettoyant:Peinture auto-nettoyante Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The addition of photoactive titanium dioxide to a coatings formulation leads to self-cleaning coatings. The activity can be tested using e.g. the methylene blue test. The photocatalytic effect impairs classical formulations under side reactions leading to yellowing, chalking and bleaching. Recent formulations overcome the side reactions to a good extend. The development of highly photoactive coatings showing a minimum of side reactions is still in progress. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3198 [article]

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A new class of labile surfactants that break down to non-surface active products upon heating or after a pre-set time, without the need for a pH change / M. Andersson in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 6/2007 (12/2007)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 44, N° 6/2007 (12/2007) . - p. 366-372 Titre : A new class of labile surfactants that break down to non-surface active products upon heating or after a pre-set time, without the need for a pH change Type de document : texte imprimé Auteurs : M. Andersson, Auteur ; A. Hillerström, Auteur ; A. Svensk, Auteur ; S. R. Younesi, Auteur ; E. Sjöström, Auteur ; I. Blute, Auteur ; Mikael Kjellin, Auteur ; J. Kizilng, Auteur ; B. Kronberg, Auteur ; J. Oldgren, Auteur ; A. Hansson, Auteur ; S. Sjöstrand, Auteur Année de publication : 2008 Article en page(s) : p. 366-372 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : Labile  surfactants  Cleavable  Car  washing  degreasing  Alkyl  ketene  dimer  Beta-keto Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : A new class of labile surfactants that break down at a controllable rate without the need for a change in pH will be presented. The invention has been patented by YKI Institute for Surface Chemistry, and is based on use of béta-keto acids or their salts as surface-active compounds. These surfactants spontaneously break down through decarboxylation, to form an oil-like ketone and CO2/HCO3–/CO32– depending on pH. The rate of breakdown can be controlled within a wide range by temperature or by certain additives, but, unlike most cleavable surfactants, a change in pH is not needed. Furthermore the surfactants can be conveniently activated from a stabile precursor just before use, and one (of many possible) precursors of this kind is already available on the industrial scale in the form of a well-known chemical that is FDA-approved in other, non-surfactant, applications. The compound in question, alkyl ketene dimer (AKD), is produced in large scale by a number of large chemical producers today, and used for hydrophobization of paper. The present article gives an overview of the surfactant chemistry, with focus on recent studies of the kinetics of activation of the surfactant precursor and breakdown kinetics of the labile surfactant at different conditions. Furthermore, possible industrial applications of the surfactant will be discussed, with one example taken from a recent feasibility Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3199 [article]

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