title: Removal of lindane from an aqueous solution by using aminopropyl silica gel-immobilized calix[6]arene.
abstract: An aminopropyl silica gel-immobilized calix[6]arene (C[6]APS) has been used for the removal of lindane from an aqueous solution in batch sorption technique. The C[6]APS was synthesized with p-tert-butylcalix[6]arene hexacarboxylate derivative and aminopropyl silica gel in the presence of N,N'-diisopropyl carbodiimide coupling reagent. The sorption study was carried out as functions of solution pH, contact time, initial lindane concentration, C[6]APS dosage and ionic strength of solution. The matrix effect of natural water samples on the sorption efficiency of C[6]APS was also investigated. Maximum lindane removal was obtained at a wide pH range of 2-8 and sorption equilibrium was achieved in 2h. The isotherm analysis indicated that the sorption data can be represented by both Langmuir and Freundlich isotherm models. Increasing ionic strength of the solutions increased the sorption efficiency and matrix of natural water samples had no effect on the sorption of lindane. By using multilinear regression model, regression equation was also developed to explain the effects of the experimental variables.
authors.affiliation: Necmettin Erbakan University, Department of Environmental Engineering, 42060 Konya, Turkey. Electronic address: ali.alitor@gmail.com.
authors.forename: Ali
authors.initials: A
authors.lastname: Tor
authors.forename: Mehmet Emin
authors.initials: ME
authors.lastname: Aydin
authors.forename: Senar
authors.initials: S
authors.lastname: Aydin
authors.forename: Mustafa
authors.initials: M
authors.lastname: Tabakci
authors.forename: Fatma
authors.initials: F
authors.lastname: Beduk
mesh_terms: D000327:Adsorption; D047250:Calixarenes / Q000737:chemistry*; D001556:Hexachlorocyclohexane / Q000737:chemistry*; D007306:Insecticides / Q000737:chemistry*; D016014:Linear Models; D010636:Phenols / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D012996:Solutions; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D007306:Insecticides; D010636:Phenols; D012996:Solutions; D014874:Water Pollutants, Chemical; C021611:aminopropyl silica gel; C476540:calix(6)arene; D047250:Calixarenes; D001556:Hexachlorocyclohexane; D012822:Silicon Dioxide
keywords: Aminopropyl silica gel; Calix[6]arene; Lindane; Multilinear regression analysis; Sorption