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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and characterization of magnetic polymethylmethacrylate microbeads carrying ethylene diamine for removal of Cu(II), Cd(II), Pb(II), and Hg(II) from aqueous solutions
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Preparation and characterization of magnetic polymethylmethacrylate microbeads carrying ethylene diamine for removal of Cu(II), Cd(II), Pb(II), and Hg(II) from aqueous solutions

机译：带有乙二胺的磁性聚甲基丙烯酸甲酯微珠的制备和表征，用于从水溶液中去除Cu（II），Cd（II），Pb（II）和Hg（II）

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Magnetic polymethylmethacrylate (mPMMA) microbeads carrying ethylene diamine (EDA) were prepared for the removal of heavy metal ions (i.e., copper, lead, cadmium, and mercury) from aqueous solutions containing different amount of these ions (5-700 mg/L) and at different pH values (2.0-8.0). Adsorption of heavy metal ions on the unmodified mPMMA microbeads was very low (3.6 mu mol/g for Cu(II), 4.2 mu mol/g for Pb(II), 4.6 mu mol/g for Cd(II), and 2.9 mu mol/g for Hg(II)). EDA-incorporation significantly increased the heavy metal adsorption (201 mu mol/g for Cu(II), 186 mu mol/g for Pb(II), 162 mu mol/g for Cd(II), and 150 mu mol/g for Hg(II)). Competitive adsorption capacities tin the case of adsorption from mixture) were determined to be 79.8 mu mol/g for Cu(II), 58.7 mu mol/g for Pb(II), 52.4 mu mol/g for Cd(II), and 45.3 mu mol/g for Hg(II),The observed affinity order in adsorption was found to be Cu(II) > Pb(II) > Cd(II) > Hg(II) for both under noncompetitive and competitive conditions. The adsorption of heavy metal ions increased with increasing PH and reached a plateau value at around pH 5.0. The optimal pH range for heavy metal removal was shown to be from 5.0 to 8.0. Desorption of heavy-metal ions was achieved using 0.1 M HNO3. The maximum elution value was as high as 98%. These microbeads are suitable for repeated use for more than five adsorption-desorption cycles without considerable loss of adsorption capacity. (C) 2000 John Wiley & Sons, Inc. [References: 29]
机译：制备了带有乙二胺（EDA）的磁性聚甲基丙烯酸甲酯（mPMMA）微珠，用于从含有不同量这些离子（5-700 mg / L）的水溶液中去除重金属离子（如铜，铅，镉和汞）。以及在不同的pH值（2.0-8.0）下。重金属离子在未修饰的mPMMA微珠上的吸附非常低（Cu（II）为3.6μmol/ g，Pb（II）为4.2μmol/ g，Cd（II）为4.6μmol/ g Hg（II）的摩尔/克）。掺入EDA显着提高了重金属的吸附量（Cu（II）为201μmol/ g，Pb（II）为186μmol/ g，Cd（II）为162μmol/ g，Cd（II）为150μmol/ g汞（II））。在从混合物中吸附的情况下，竞争性吸附能力被确定为：Cu（II）为79.8μmol/ g，Pb（II）为58.7μmol/ g，Cd（II）为52.4μmol/ g。对于Hg（II）为mol / g，在非竞争和竞争条件下，观察到的吸附亲和力顺序为Cu（II）> Pb（II）> Cd（II）> Hg（II）。重金属离子的吸附随着PH的增加而增加，并在pH 5.0左右达到平稳值。去除重金属的最佳pH范围显示为5.0至8.0。使用0.1 M HNO3可以实现重金属离子的解吸。最大洗脱值高达98％。这些微珠适合重复使用超过五个吸附-解吸循环，而不会显着降低吸附容量。 （C）2000 John Wiley＆Sons，Inc. [参考：29]

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