title: Removal efficiency of a calix[4]arene-based polymer for water-soluble carcinogenic direct azo dyes and aromatic amines.
abstract: A Mannich base derivative of 5,11,17,23-tetrakis-[(1,4-dioxa-8-azaspiro-[4.5]decanyl)methyl]-25,26,27,28-tetrahydroxy calix[4]arene 3 was synthesized by the treatment of calix[4]arene with a cyclic secondary amine (1,4-dioxa-8-azaspiro-[4.5]decane) and formaldehyde. The compound 3 was treated with dibromoxylene to obtain a calix[4]arene-based copolymer 4. In batch sorption experiments of selected carcinogenic azo dyes and aromatic amines, the compounds 3 and 4 were found to be a better sorbent for azo dyes than for the aromatic amines. It was observed that the percentage of azo dye removal was 95-99% for compound 3 and 83-97% for 4 when the pH of the dye solution was in the range of 2.0-8.0. The sorption of azo dyes and aromatic amines by calix[4]arenes-based compounds indicates that amino groups play the major role for the formation of hydrogen bonds and electrostatic interactions.
authors.affiliation: Department of Chemistry, Selcuk University, Konya, Turkey.
authors.forename: Ezgi
authors.initials: E
authors.lastname: Akceylan
authors.forename: Müfit
authors.initials: M
authors.lastname: Bahadir
authors.forename: Mustafa
authors.initials: M
authors.lastname: Yilmaz
mesh_terms: D000588:Amines / Q000302:isolation & purification*; D001391:Azo Compounds / Q000302:isolation & purification*; D047250:Calixarenes / Q000737:chemistry*; D002273:Carcinogens / Q000302:isolation & purification*; D004396:Coloring Agents / Q000737:chemistry*; D006860:Hydrogen Bonding; D010636:Phenols / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D055672:Static Electricity
chemical_list: D000588:Amines; D001391:Azo Compounds; D002273:Carcinogens; D004396:Coloring Agents; D010636:Phenols; D011108:Polymers; C121325:calix(4)arene; D047250:Calixarenes