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首页> 外文期刊>Materials science & engineering. C, Biomimetic and supramolecular systems >Synthesis and characterization of poly(hydroxyethyl methacrylate-N-methacryloyl-(L)-glutamic acid) copolymer beads for removal of lead ions
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Synthesis and characterization of poly(hydroxyethyl methacrylate-N-methacryloyl-(L)-glutamic acid) copolymer beads for removal of lead ions

机译：聚甲基丙烯酸羟乙酯-N-甲基丙烯酰基-（L）-谷氨酸共聚物小球的合成及表征

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N-methacryloyl-(L)-glutamic acid (MAGA) was synthesized using methacryloyl chloride and L-glutamic acid methyl ester as a metal-complexing ligand and/or comonomer. MAGA was characterized by FTIR and NMR. Spherical beads with an average diameter of 150-200 μm were obtained by suspension polymerization of MAGA and 2-hydroxyethyl methacrylate (HEMA) performed in an aqueous dispersion medium. Poly(HEMA-MAGA) beads were characterized by swelling studies, surface area measurements and elemental analysis. Poly(HEMA-MAGA) beads have a specific surface area of 56.7 m~2/g. Poly(HEMA-MAGA) beads were used in the removal studies of Pb~(2+) ions. Adsorption equilibrium was achieved in about 60 min. The adsorption of Pb~(2+) ions onto PHEMA beads was negligible (0.38 mg/g). The MAGA incorporation into the polymer structure significantly increased the lead adsorption capacity (348 mg/g). The adsorption of Pb~(2+) ions increased with increasing pH and reached a plateau value at around pH 5.0. Competitive adsorption of heavy metal ions from synthetic wastewater was also studied. The adsorption capacities are 42.5 mg/g for Pb~(2+), 26.8 mg/g for Hg~(2+) and 17.6 mg/g for Cd~(2+) at 0.5 mmol/l metal concentration. Consecutive adsorption and elution operations showed the feasibility of repeated use for poly(HEMA-MAGA) chelating beads.
机译：使用甲基丙烯酰氯和L-谷氨酸甲酯作为金属络合配体和/或共聚单体，合成了N-甲基丙烯酰基-（L）-谷氨酸（MAGA）。 MAGA通过FTIR和NMR表征。通过在水性分散介质中进行MAGA和甲基丙烯酸2-羟乙酯（HEMA）的悬浮聚合，获得平均直径为150-200μm的球形珠。通过溶胀研究，表面积测量和元素分析来表征聚（HEMA-MAGA）珠。聚（HEMA-MAGA）磁珠的比表面积为56.7 m〜2 / g。聚（HEMA-MAGA）磁珠用于去除Pb〜（2+）离子。在约60分钟内达到吸附平衡。 PEMA〜（2+）离子在PHEMA珠上的吸附微不足道（0.38 mg / g）。 MAGA掺入聚合物结构显着提高了铅吸附量（348 mg / g）。随着pH值的增加，Pb〜（2+）离子的吸附量增加，并在pH 5.0左右达到平稳值。还研究了合成废水中竞争性吸附重金属离子的方法。在0.5 mmol / l的金属浓度下，Pb〜（2+）的吸附容量为42.5 mg / g，Hg〜（2+）的吸附容量为26.8 mg / g，Cd〜（2+）的吸附容量为17.6 mg / g。连续的吸附和洗脱操作显示了重复使用聚（HEMA-MAGA）螯合珠的可行性。

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