Synthesis of N-Methylimidazolium Functionalized Strongly Basic Anion Exchange Resins for Adsorption of Cr(VI)

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• 作者：Lili Zhu^&#8224 ; ^‡ ; ; Yinghui Liu^&#8224 ; ^‡ ; ; Ji Chen*^&#8224 ;
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2009
• 出版时间：April 1, 2009
• 年：2009
• 卷：48
• 期：7
• 页码：3261-3267
• 全文大小：148K
• 年卷期：v.48,no.7(April 1, 2009)
• ISSN：1520-5045

文摘

N-Methylimidazolium functionalized strongly basic anion exchange resins in the Cl⁻ form (RCl) and SO₄²⁻ form (R₂SO₄) were synthesized and employed for adsorption of Cr(VI) from aqueous solution. FT-IR and elementary analysis proved the structures of anion exchange resins and the content of functional groups. The gel-type strongly basic anion exchange resins had high thermal stability according to TGA and good chemical stability under the experimental conditions. The adsorption behaviors of Cr(VI) on RCl and R₂SO₄ were studied using the batch technique. It was shown that adsorption equilibrium was reached rapidly within 60 min. The adsorption data for RCl and R₂SO₄ were consistent with the Langmuir isotherm equation. The maximum adsorption capacities of RCl and R₂SO₄ were 132 and 125 mg/g, respectively, with almost all active sites fully occupied. RCl and R₂SO₄ could be used in the wide pH range 1−12 and were very suitable to remove Cr(VI) at a low concentration level. They also showed great preference to Cr(VI) compared to the other counterions. RCl was easily regenerated using the mixed solution of 0.3 mol/L NaOH and 0.3 mol/L NaCl, and retained nearly 100% of its orginal capacity during four cycles.