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Determining binding of polycyclic aromatic hydrocarbons to micelles formed by SDS and SOL using semi-equilibrium dialysis.
Sarker, Ashish K; Brown, R Stephen.
Afiliação
  • Sarker AK; Department of Chemistry, Queen's University at Kingston, Kingston, ON, Canada K7L 3N6.
  • Brown RS; Department of Chemistry, Queen's University at Kingston, Kingston, ON, Canada K7L 3N6. Electronic address: stephen.brown@chem.queensu.ca.
Ecotoxicol Environ Saf ; 208: 111635, 2021 Jan 15.
Article em En | MEDLINE | ID: mdl-33396155
ABSTRACT
Micellar enhanced ultra-filtration (MEUF) is a modified ultrafiltration (UF) method that can remove small molecules that are not effectively removed by UF alone. In this work we used a similar semi-equilibrium dialysis (SED) method to characterize two anionic surfactants, sodium dodecyl sulfate (SDS) and sodium laurate (SOL), as MEUF candidates to remove several polycyclic aromatic hydrocarbon (PAH) compounds. These anionic surfactants have low toxicity and are more biodegradable compared to the fairly toxic and persistent cetyltrimethylammonium bromide (CTABr) and similar cationic surfactants, which is important as MEUF surfactants may be present in the treated effluent. The log binding constants (Log KB) of the PAHs naphthalene, phenanthrene, pyrene and fluorene to SDS ranged from 3.07 to 4.48, which compared well with the previous results for CTABr and indicated that SDS is an excellent candidate for MEUF. The log binding constants for the same PAHs with SOL micelles ranged from 2.11 to 3.53, which suggested that SOL might be adequate for stronger-binding PAH like pyrene and fluorene but less suitable for naphthalene and phenanthrene. The results demonstrated a strong correlation between the Log KB with one micelle type and the Log KB with the other, suggesting a common set of properties and interactions are responsible for the binding. Similar to the previous results for CTABr, a significant correlation between Log KB and Log KOW values indicates that hydrophobic character is the main driving force for PAH binding with these anionic micelles. This may also be useful for predicting MEUF performance for various compound/surfactant combinations where Log KB is not known.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Hidrocarbonetos Policíclicos Aromáticos / Dodecilsulfato de Sódio / Tensoativos / Ácidos Láuricos / Micelas Idioma: En Ano de publicação: 2021 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Hidrocarbonetos Policíclicos Aromáticos / Dodecilsulfato de Sódio / Tensoativos / Ácidos Láuricos / Micelas Idioma: En Ano de publicação: 2021 Tipo de documento: Article