title: Removal of acidic indigo carmine textile dye from aqueous solutions using radiation induced cationic hydrogels.
abstract: This study examined the removal of acidic indigo carmine dyes from aqueous solutions using cationic hydrogels. Irradiated hydrogels were investigated as a new sorbent for dye removal from aqueous solution. Poly(N,N-Diethylamino ethyl methacrylate) [poly(DEAEMA)] hydrogels were prepared by radiation polymerisation of N,N-diethylamino ethyl methacrylate [DEAEMA] monomer in the presence of cross-linking agent, ethylene glycol dimethacrylate [EGDMA], and used for the removal of acidic indigo carmine textile dye. The adsorption of dyes was examined using a batch sorption technique. The effects of pH, time and initial dye concentration on the adsorption capacity of hydrogels were investigated. Maximum gelation ratio was 98.2% at irradiation dose of 5.3 kGy. Maximum equilibrium volume swelling, V/V(0), value was 21.3 at pH 2.8. Maximum amount of adsorbed indigo carmine onto hydrogels was 96.7 mg dye/g gel at pH 2.8, 21 h of adsorption time and 120 mg/L initial dye solution. Swelling and adsorption capacity increased with decreasing of pH. Compared with Congo red, amounts of adsorbed indigo carmine are much higher than those of Congo red. Langmuir isotherm model was the best fit for these poly(DEAEMA) hydrogels-indigo carmine systems.
authors.affiliation: Biochemistry Division, Department of Chemistry, Hacettepe University, 06242 Ankara, Turkey. mufrettin@yahoo.com
authors.forename: Müfrettin Murat
authors.initials: MM
authors.lastname: Sari
mesh_terms: D000327:Adsorption; D002412:Cations / Q000737:chemistry; D004396:Coloring Agents / Q000302:isolation & purification; D003224:Congo Red / Q000302:isolation & purification; D020100:Hydrogels / Q000138:chemical synthesis*; D006863:Hydrogen-Ion Concentration; D007203:Indigo Carmine / Q000302:isolation & purification*; D008689:Methacrylates / Q000737:chemistry* / Q000528:radiation effects; D009757:Nylons / Q000737:chemistry* / Q000528:radiation effects; D013783:Textile Industry; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D002412:Cations; D004396:Coloring Agents; D020100:Hydrogels; D008689:Methacrylates; D009757:Nylons; D014874:Water Pollutants, Chemical; C109846:poly(2-(diethylamino)ethyl methacrylate); D003224:Congo Red; D007203:Indigo Carmine