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首页> 外文期刊>Journal of Applied Polymer Science >Metal-chelating properties of poly(2-hydroxyethyl methacrylate-methacryloylamidohistidine) membranes
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Metal-chelating properties of poly(2-hydroxyethyl methacrylate-methacryloylamidohistidine) membranes

机译：聚（甲基丙烯酸2-羟乙酯-甲基丙烯酰胺基组氨酸）膜的金属螯合性能

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Metal-chelating membranes have advantages as adsorbents in comparison with conventional beads because they are not compressible and they eliminate internal diffusion limitations. The aim of this study was to explore in detail the performance of poly (2-hydroxyethyl methacrylate-methacryloylamidohistidine) [poly(HEMA-MAH)] membranes for the removal of three toxic heavy-metal ions-Cd(II), Pb(II), and Hg(II)-from aquatic systems. The poly(HEMA-MAH) membranes were characterized with scanning electron microscopy and H-1-NMR spectroscopy. The adsorption capacity of the poly(HEMA-MAH) membranes for the selected heavy-metal ions from aqueous media containing different amounts of these ions (30-500 mg/L) and at different pH values (3.0-7.0) was investigated. The adsorption capacity of the membranes increased with time during the first 60 min and then leveled off toward the equilibrium adsorption. The maximum amounts of the heavy-metal ions adsorbed were 8.2, 31.5, and 23.2 mg/g for Cd(II), Pb(II), and Hg(II), respectively. The competitive adsorption of the metal ions was also studied. When the metal ions competed, the adsorbed amounts were 2.9 mg of Cd(II)/g, 14.8 mg of Pb(II)/g, and 9.4 mg of Hg(II)/g. The poly(HEMA-MAH) membranes Could be regenerated via washing with a solution of nitric acid (0.01M). The desorption ratio was as high as 97%. These membranes were suitable for repeated use for more than three adsorption/desorption cycles with negligible loss in the adsorption capacity. The stability constants for the metal-ion/2-methacryloylamidohistidine complexes were calculated to be 3.47 x 10(6), 7.75 x 10(7), and 2.01 x 10(7) L/mol for Cd(II), Pb(II), and Hg(II) ions, respectively, with the Ruzic method. (c) 2005 Wiley Periodicals, Inc.
机译：与常规的珠相比，金属螯合膜具有吸附剂优势，因为它们不可压缩并且消除了内部扩散限制。这项研究的目的是详细探讨聚（甲基丙烯酸2-羟乙酯-甲基丙烯酰胺基组氨酸）[聚（HEMA-MAH）]膜对三种有毒重金属离子-镉（II），铅（II）的去除性能。 ）和Hg（II）-来自水生系统。聚（HEMA-MAH）膜用扫描电子显微镜和H-1-NMR光谱表征。研究了聚（HEMA-MAH）膜对所选重金属离子的吸附能力，这些重金属离子来自含有不同量（30-500 mg / L）和不同pH值（3.0-7.0）的水介质。在最初的60分钟内，膜的吸附量随时间增加，然后逐渐趋于平衡吸附。 Cd（II），Pb（II）和Hg（II）的最大重金属离子吸附量分别为8.2、31.5和23.2 mg / g。还研究了金属离子的竞争性吸附。当金属离子竞争时，吸附量为2.9 mg Cd（II）/g、14.8 mg Pb（II）/ g和9.4 mg Hg（II）/ g。聚（HEMA-MAH）膜可以通过用硝酸（0.01M）溶液洗涤而再生。解吸率高达97％。这些膜适合重复使用三个以上的吸附/解吸循环，而吸附能力的损失可忽略不计。对于Cd（II），Pb（II），金属离子/ 2-甲基丙烯酰胺基氨基组氨酸络合物的稳定常数经计算为3.47 x 10（6），7.75 x 10（7）和2.01 x 10（7）L / mol。 ）和Hg（II）离子，分别采用Ruzic方法。 （c）2005年Wiley Periodicals，Inc.

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