title: Estimation of chromium(VI) sorption efficiency of novel regenerable p-tert-butylcalix[8]areneoctamide impregnated Amberlite resin.
abstract: The article describes a convenient synthesis and Cr(VI) extraction efficiency of a novel p-tert-butylcalix[8]areneoctamide impregnated Amberlite (XAD-4) resin. Using p-tert-butylcalix[8]arene macrocyclic building block, two strategies have been developed; i.e., derivatization of p-tert-butylcalix[8]arene framework with sophisticated ionophoric groups having efficiency to extract oxoanions from aqueous media and, impregnation of p-tert-butylcalix[8]arene derivative onto the polymeric support. Liquid-liquid and solid-liquid extraction experiments have been performed to evaluate the Cr(VI) extraction efficiency of both p-tert-butylcalix[8]arene derivative and the impregnated resin. From the results, it has been deduced that solid-phase extraction method is more convenient and efficient than liquid-liquid extraction process. The impregnated XAD-4 resin has been found regenerable with better extracting efficiency as compared to the simple p-tert-butylcalix[8]areneoctamide ionophore.
authors.affiliation: National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro, Pakistan.
authors.forename: Imdadullah
authors.initials: I
authors.lastname: Qureshi
authors.forename: Shahabuddin
authors.initials: S
authors.lastname: Memon
authors.forename: Mustafa
authors.initials: M
authors.lastname: Yilmaz
mesh_terms: D000327:Adsorption; D047250:Calixarenes / Q000737:chemistry*; D002857:Chromium / Q000302:isolation & purification*; D003247:Conservation of Natural Resources; D007475:Ion Exchange Resins; D011137:Polystyrenes; D011145:Polyvinyls; D052616:Solid Phase Extraction / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
chemical_list: D007475:Ion Exchange Resins; D011137:Polystyrenes; D011145:Polyvinyls; D014874:Water Pollutants, Chemical; D002857:Chromium; D047250:Calixarenes; C012101:XAD-4 resin