Silica Gel as an Adsorbent in the Removal of Cationic Blue X-Bl from Aqueous Solutions and its Regeneration by UV-Fenton Oxidation

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%.

• Periodical: Advanced Materials Research (Volume 936)
• Pages: 875-880
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.936.875
• Online since: June 2014
• Authors: Qiu Yuan Xiong*
• Keywords: Adsorption, Dye, Oxidation, Regeneration, Silica Gel

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