Adsorption Properties toward Trivalent Rare Earths by Alginate Beads Doping with Silica

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• 作者：Fuchun Wang ; Junmei Zhao ; Feng Pan ; Huacong Zhou ; Xingfu Yang ; Wensong Li ; Huizhou Liu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：March 6, 2013
• 年：2013
• 卷：52
• 期：9
• 页码：3453-3461
• 全文大小：357K
• 年卷期：v.52,no.9(March 6, 2013)
• ISSN：1520-5045

文摘

Novel alginate hybrid beads were prepared by doping with silica (abbreviated as ALG/SiO₂), and their adsorption behavior toward rare earths(III) had been investigated. For the whole lanthanides, it exhibits a distinct 鈥渢etrad effect鈥?with increasing atomic number. Taking Nd as an example, the effects of the pH, adsorption kinetics, isotherms, and regeneration of adsorbents had been studied systematically. Doped SiO₂ can enhance the mechanical strength of the beads, and the hybrid adsorbents show no observable swelling during the adsorption process. It is interesting to note that Nd^III adsorption can be improved about 0.1 mmol/g after the first cycle and shows no apparent decline until the 12th cycle. Finally, it can be concluded that ALG/SiO₂ is superior to the other hybrid alginate adsorbents for the adsorption of rare earths.