超声辅助合成半胱氨酸功能化的Fe3O4磁性纳米颗粒及其在吸附汞离子中的应用
首发时间:2012-01-10
摘要:以亚铁离子作为单一铁源,空气中的氧为氧化剂,半胱氨酸为保护剂,通过超声辅助氧化沉淀法制备粒径均匀的半胱氨酸功能化四氧化三铁磁性纳米颗粒(Fe3O4-Cys NPs)。采用红外光谱(FTIR)、透射电镜(TEM)、X射线衍射(XRD)、振动样品磁强计(VSM)、热重分析(TGA)等技术手段对Fe3O4-Cys 磁性纳米颗粒的结构和性能进行表征。实验发现,合成的Fe3O4-Cys NPs由Fe3O4表面铁(Fe)原子和L-Cys的硫(S)原子配位结合而成,Fe3O4表面半胱氨酸分子的含量约为23%;该纳米粒子粒径小而均匀(约为15nm),磁响应良好,具备超顺磁性,热稳定性优异。在此基础上本实验又研究了该纳米粒子对水中重金属离子Hg(II)的吸附性能。当吸附时间T=20min、吸附剂用量15μmol、pH=5时,Fe3O4-Cys NPs对重金属Hg(II)离子的吸附效率高达95%,基于Lagergrent方程计算其吸附速率常数为0.22min-1,表明Fe3O4-Cys NPs可以快速高效地吸附水溶液中的Hg(II)离子。
关键词: 功能化纳米颗粒 四氧化三铁 Hg(II)离子 吸附
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Adsorption of Hg(II) ions by Cys-functionalized magnetic Fe3O4 nanoparticles synthesized with the assistance of sonication
Abstract:Using Fe2+ as precursors、oxygen in air as oxidant and L-cysteine as protectant, the uniform Cys-functionalized Fe3O4 magnetic nanoparticles (Fe3O4-Cys NPs) was obtained by oxidation-precipitation method with the assistance of sonication. The property of the NPs was characterized by fourier transform infrared spectroscopy(FTIR), transmission electron microscope (TEM), X-Ray diffraction(XRD), vibrating sample magnetometer(VSM) and thermogravimetric analysis(TGA). Results showed the formation of surface chemical bonds between L-Cys and Fe3O4 NPs and the content of L-Cys on the surface of Fe3O4 was ~23%. The diameter of the NPs was small and uniform (~15nm). And these NPs expressed high magnetic responsiveness, superparamagnetism and high heat-stability. The adsorption performance of these NPs for mercury ion(Hg(II)) in water was also investigated. It is found that the adsorption efficiency was 95% when the adsorption time was 20min, the adsorbent dosage was 15μmol and the pH was 5. The adsorption rate constant based on the formula of Lagergrent was 0.22min-1, indicating that the Hg(II) in water can be adsorbed rapidly by the Fe3O4-Cys NPs.
Keywords: functionalized nanoparticles Fe3O4 Hg (II) ions adsorption
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超声辅助合成半胱氨酸功能化的Fe3O4磁性纳米颗粒及其在吸附汞离子中的应用
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