改性纤维素微球对 1-烷基-3-甲基咪唑氯盐离子液体的高效吸附。
Efficient adsorption of 1-alkyl-3-methylimidazolium chloride ionic liquids onto modified cellulose microspheres.
机构信息
Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry, Key Laboratory for Fundamental Science, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry, Key Laboratory for Fundamental Science, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
出版信息
Carbohydr Polym. 2015 Sep 5;128:171-8. doi: 10.1016/j.carbpol.2015.04.018. Epub 2015 Apr 22.
A novel sulfonated cellulose microsphere adsorbent (CGS) was prepared by pre-irradiation induced emulsion grafting of glycidyl methacrylate (GMA) onto the cellulose microsphere, followed by sulfonation. The resulting CGS exhibited superior adsorption ability toward 1-alkyl-3-methylimidazolium chloride ([CnMIM]Cl) ionic liquids (ILs). The adsorption equilibrium could be attained rapidly within 40 min for representative 1-butyl-3-methylimidazolium chloride ([C4MIM]Cl) using CGS with different amounts of SO3H group. The adsorption behavior of CGS toward [C4MIM]Cl was well described by the pseudo-second-order model and the Langmuir model. The maximum adsorption capacity toward [C4MIM]Cl was 1.08 mmol/g in the wide range of pH (4.8-10.1). In addition, the adsorption capacity of CGS toward [CnMIM]Cl increased with the alkyl length of cations of [CnMIM]Cl due to the hydrophobic interaction and cation exchange adsorption. Spent CGS could be easily regenerated by 0.1 mol/L HCl or NaCl. The results indicated that this new adsorbent is useful in removing ILs from wastewater.
一种新型的磺化纤维素微球吸附剂（CGS）是通过预辐射引发的甲基丙烯酸缩水甘油酯（GMA）在纤维素微球上接枝乳液，然后磺化制得的。所得的 CGS 对 1-烷基-3-甲基咪唑氯化物([CnMIM]Cl)离子液体(ILs)表现出优异的吸附能力。使用不同量的-SO3H 基团的 CGS，代表的 1-丁基-3-甲基咪唑氯化物([C4MIM]Cl)的吸附平衡可以在 40 分钟内达到。CGS 对[C4MIM]Cl 的吸附行为很好地由拟二级模型和朗缪尔模型描述。在较宽的 pH 值范围内(4.8-10.1)，CGS 对[C4MIM]Cl 的最大吸附容量为 1.08mmol/g。此外，由于疏水相互作用和阳离子交换吸附，CGS 对[CnMIM]Cl 的吸附容量随[CnMIM]Cl 阳离子的烷基长度的增加而增加。用过的 CGS 可以很容易地通过 0.1mol/L 的 HCl 或 NaCl 再生。结果表明，这种新型吸附剂可用于从废水中去除 ILs。
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