Abstract
The removal of cationic Blue X-BL in aqueous solution by adsorption of silica gel was investigated. Effects of pH, initial concentration of dye solution and temperature on the adsorption of Cationic Blue X-BL onto silica gel were studied. When the initial concentration of the blue dye was 100 mg/dm3, silica gel is 0.6 g at pH 9.3 and at 303 K, adsorption reached equilibrium after 2 h with the final adsorption quantity 16.38 mg/g. Fenton reaction with UV light was applied in the regeneration operation of silica gel which can transmit most of the UV light. The concentration of Fe2+ and H2O2 was evaluated and when the concentration of Fe2+ and H2O2 were 0.05 mmol/dm3 and 0.132 mol/dm3, the first, second, third and forth regeneration efficiency were 84.68 %, 82.05 %, 65.26% and 50.73 %, respectively. In order to improve the regeneration capacity and silica gels reuse times, acid washing was introduced in the forth regeneration after Fenton reaction, which can enhance the regeneration efficiency to 92.19%.
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