title: Surfactant-coated aluminum hydroxide for the rapid removal and biodegradation of hydrophobic organic pollutants in water.
abstract: The removal of hydrophobic organic pollutants in water to surfactant-coated aluminum hydroxide [surfactant-Al(OH)(3)] was investigated. Anionic surfactants such as sodium dodecyl sulfate (SDS), sodium bis(2-ethylhexyl)sulfosuccinate (AOT), and sodium oleate were sorbed on positively charged aluminum hydroxide at pH 7 and formed hydrophobic aggregates that can incorporate hydrophobic organic pollutants in water. Because of the hydrophobic interaction and decrease in the positive charge, surfactant-Al(OH)(3) was coagulated into precipitates that can readily be separated from water. Hydrophobic organic pollutants such as alkylphenols, polycyclic aromatic hydrocarbons, estrogens, chlorinated antifungals, and pesticides were well collected to the precipitates and thus efficiently removed from water. The collection of hydrophobic organic pollutants was correlated to their aqueous-octanol distribution coefficient. The decomposition of hydrophobic organic pollutants was examined using a bacterial agent (Bacillus subtilis). Hydrophobic organic compounds collected to AOT-Al(OH)(3) or sodium oleate-Al(OH)(3) were insufficiently decomposed. On the other hand, nonylphenol, octylphenol, and pendimethalin collected to SDS-Al(OH)(3) were decomposed within 1 week. The decomposition was accelerated by the collection to SDS-Al(OH)(3).
authors.affiliation: Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan. saitoh@numse.nagoya-u.ac.jp
authors.forename: Tohru
authors.initials: T
authors.lastname: Saitoh
authors.forename: Masato
authors.initials: M
authors.lastname: Yamaguchi
authors.forename: Masataka
authors.initials: M
authors.lastname: Hiraide
mesh_terms: D000327:Adsorption; D000536:Aluminum Hydroxide / Q000737:chemistry*; D001673:Biodegradation, Environmental; D004143:Dioctyl Sulfosuccinic Acid / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D057927:Hydrophobic and Hydrophilic Interactions; D019301:Oleic Acid / Q000737:chemistry; D009930:Organic Chemicals / Q000302:isolation & purification*; D010636:Phenols / Q000302:isolation & purification; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D055672:Static Electricity; D013501:Surface-Active Agents / Q000737:chemistry*; D013997:Time Factors; D014260:Triclosan / Q000302:isolation & purification; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D009930:Organic Chemicals; D010636:Phenols; D012997:Solvents; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D004143:Dioctyl Sulfosuccinic Acid; D019301:Oleic Acid; D012967:Sodium Dodecyl Sulfate; C013173:osteum; D014260:Triclosan; D000536:Aluminum Hydroxide; C025256:nonylphenol