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首页> 外文期刊>Electroanalysis >Comparison of Cadmium Cd2+ and Lead Pb2+ Binding by Fe2O3@SiO2-EDTA Nanoparticles - Binding Stability and Kinetic Studies
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Comparison of Cadmium Cd2+ and Lead Pb2+ Binding by Fe2O3@SiO2-EDTA Nanoparticles - Binding Stability and Kinetic Studies

机译：镉CD2 +和铅Pb2 +与Fe2O3的结合的比较 - SiO2-EDTA纳米粒子 - 结合稳定性和动力学研究

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This study describes the synthesis and characterization of ethylenediaminetetraacetic acid (EDTA) functionalized magnetic nanoparticles of 20 nm in size - Fe3O4@SiO2-EDTA - which were used as a novel magnetic adsorbent for Cd(II) and Pb(II) binding in aqueous medium. These nanoparticles were obtained in two-stage synthesis: covering by tetraethyl orthosilicate and functionalization with EDTA derivatives. Nanoparticles were characterized using TEM, FT-IR, and XPS methods. Metal ions were detected under optimized experimental conditions using Differential Pulse Anodic Stripping Voltammetry (DPASV) and Hanging Mercury Drop Electrode (HDME) techniques. We compared the ability of Fe3O4@SiO2-EDTA to bind cadmium and lead in concentration of 553.9 mu g L-1 and 647.5 mu g L-1, respectively. Obtained results show that the adsorption rate of cadmium binding was very high. The equilibrium for Fe3O4@SiO2-EDTA-Cd(II) was reached within 19 min while for the Fe3O4@SiO2-EDTA-Pb(II) was reached within 25 minutes. About 2 mg of nanoparticles was enough to bind 87.5 % Cd(II) and 54.1 % Pb(II) content. In the next step the binding capacity of Fe3O4@SiO2-EDTA nanoparticles was determined. Only 1.265 mg of Fe3O4@SiO2-EDTA was enough to bind 96.14 % cadmium ions while 5.080 mg of nanoparticles bound 40.83 % lead ions. This phenomenon proves that the studied nanoparticles bind Cd(II) much better than Pb(II). The cadmium ions binding capacity of Fe3O4@SiO2-EDTA nanoparticles decreased during storage in 0.5 M KCl solution. Two days of Fe3O4@SiO2-EDTA storage in KCl solution caused the 32 % increase in the amount of nanoparticles required to bind 60 % of cadmium while eight-days storage caused further increase to 328 %. The performed experiment confirmed that the storage of nanoparticles in solution without any surfactants reduced their binding capacity. The best binding capacity was observed for the nanoparticles prepared directly before the electrochemical measurements.
机译：本研究描述了乙二胺四乙酸（EDTA）官能化磁性纳米颗粒的合成和表征在尺寸-FE3O4-EDTA中为20nm - 其用作在水性介质中结合的CD（II）和PB（II）的新型磁性吸附剂。在两阶段合成中得到这些纳米颗粒：通过用EDTA衍生物的四乙基硅酸盐覆盖并用EDTA衍生物官能化。使用TEM，FT-IR和XPS方法表征纳米颗粒。在优化的实验条件下使用差脉冲阳极溶出伏安法（DPASV）和悬挂汞滴电极（HDME）技术在优化的实验条件下检测金属离子。我们将Fe3O4 @ SiO2-EDTA与镉结合并浓度的浓度分别进行了553.9μg-1和647.5μg-1的能力。得到的结果表明，镉结合的吸附速率非常高。在19分钟内达到Fe3O4 -EDTA-CD（II）的Fe3O4-EDTA-CD（II）的平衡，在25分钟内达到SiO 2-EDTA-PB（II）。约2mg纳米颗粒足以结合87.5％CD（II）和54.1％Pb（II）含量。在下一步中，测定Fe3O4 @ SiO 2-EDTA纳米颗粒的结合能力。只有1.265mg Fe3O4 @ SiO2-EDTA足以结合96.14％的镉离子，而5.080mg纳米颗粒结合40.83％的铅离子。这种现象证明，研究的纳米颗粒结合CD（II）比Pb（II）更好。在0.5M KCl溶液中储存期间Fe3O4-EDTA纳米粒子的Fe3O4-EDTA纳米颗粒的镉离子结合能力降低。在KCl溶液中25天的Fe3O4 @ SiO2-EDTA储存使得结合60％镉所需的纳米粒子量增加32％，同时八天储存引起的进一步增加至328％。所进行的实验证实，在没有任何表面活性剂的溶液中储存纳米颗粒的储存减少了它们的结合能力。对于直接在电化学测量之前，可以观察到最佳结合能力。

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