Experimental Study on Adsorption Mechanism of U(VI) by Modified CMC

Abstract:

The modified carboxymethyl cellulose(CMC) was prepared and explored to adsorb uranium(Ⅵ) ions from aqueous solution in a batch system. The experimental results showed that on the condition of reaction temperature 70~80°C, CMC 30%-35% (w/w), CMC to AA (w/w) of 10:2.5 and reaction time 3.5-4 h, the modification effect was the best. High removal efficient of U(Ⅵ) was obtained 97.1% at temperature of 25°C, pH value of 5.0, dosage of modified CMC 0.1 g/L and contact time of 60 min. It was found that the adsorption process was best described by Freundlich model and pseudo-first-order kinetic model (R2=0.9618), indicating that the adsorption is mainly on the surface of the modified CMC. Thermodynamics parameters of negative value of ΔG0 and positive value of ΔH0 revealed the spontaneity and endothermic nature of the adsorption. The adsorption is primarily due to physical adsorption.

• Periodical: Advanced Materials Research (Volume 650)
• Pages: 231-237
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.650.231
• Online since: January 2013
• Authors: Shu Kui Zhou, Guang Ming Zeng, Ying Jiu Liu, Hai Yang Jiang
• Keywords: Adsorption Mechanism, Modified Cmc, U(vi)

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