Removal of acidic indigo carmine textile dye from aqueous solutions using radiation induced cationic hydrogels

摘要

This study examined the removal of acidic indigo carmine dyes from aqueous solutions usingncationic hydrogels. Irradiated hydrogels were investigated as a new sorbent for dye removal fromnaqueous solution. Poly(N,N-Diethylamino ethyl methacrylate) [poly(DEAEMA)] hydrogels werenprepared by radiation polymerisation of N,N-diethylamino ethyl methacrylate [DEAEMA] monomernin the presence of cross-linking agent, ethylene glycol dimethacrylate [EGDMA], and used fornthe removal of acidic indigo carmine textile dye. The adsorption of dyes was examined using anbatch sorption technique. The effects of pH, time and initial dye concentration on the adsorptionncapacity of hydrogels were investigated. Maximum gelation ratio was 98.2% at irradiation dosenof 5.3 kGy. Maximum equilibrium volume swelling, V/V0, value was 21.3 at pH 2.8. Maximumnamount of adsorbed indigo carmine onto hydrogels was 96.7mg dye/g gel at pH 2.8, 21 h ofnadsorption time and 120mg/L initial dye solution. Swelling and adsorption capacity increased withndecreasing of pH. Compared with Congo red, amounts of adsorbed indigo carmine are muchnhigher than those of Congo red. Langmuir isotherm model was the best fit for thesenpoly(DEAEMA) hydrogels-indigo carmine systems.