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分别以离子液体1-烯丙基-3-甲基氯代咪唑([Amim]Cl)与氢氧化钠/尿素水溶液为反应介质,采用丙烯酸单体,过硫酸铵为引发剂,N,N’-亚甲基双丙烯酰胺为交联剂,利用接枝共聚方法合成纤维素-丙烯酸接枝共聚物。以轻液体石蜡为分散相,经反相悬浮过程将接枝物球化,考察了分散剂用量、油水比、转速对成球的影响,确定了较合理的反相悬浮球化条件。采用傅里叶变换红外光谱(FT-IR)、透射电子显微镜(TEM)对纤维素吸附剂进行了表征。探讨了聚合物微球对金属离子的吸附性能。结果表明,聚合物微球对Cu2+离子有较好的吸附效果,吸附量分别为230.8 mg/g([Amim]Cl体系)与241.9 mg/g(氢氧化钠/尿素水溶液体系),具有良好的再生能力,且[Amim]Cl体系中制备的吸附剂具有较高的成球得率。
Using ionic liquid 1-allyl-3-methylchlorimidazole ([Amim] Cl) and sodium hydroxide / urea aqueous solution as the reaction medium, using acrylic acid monomer and ammonium persulfate as initiator, - methylene bisacrylamide as cross-linking agent, graft copolymerization using cellulose-acrylic acid graft copolymer. The light liquid paraffin was used as disperse phase, and the grafted material was spheroidized by reversed-phase leaching process. The effect of dispersant dosage, oil-water ratio and rotational speed on spherulites formation was investigated. The cellulose adsorbents were characterized by Fourier transform infrared spectroscopy (FT-IR) and transmission electron microscopy (TEM). The adsorption properties of polymer microspheres to metal ions were discussed. The results showed that the adsorption of Cu2 + ions by the polymer microspheres was better than that of the Cu2 + ion. The adsorption capacity of the polymer microspheres was 230.8 mg / g ([Amim] Cl) and 241.9 mg / g (aqueous sodium hydroxide / Regeneration ability, and the adsorbents prepared in [Amim] Cl system have a higher yield of spheroids.