Preconcentration of mercury(II) using a thiol-functionalized metal-organic framework nanocomposite as a sorbent
Preconcentration of mercury(II) using a thiol-functionalized metal-organic framework nanocomposite as a sorbent
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DOI：
10.1007/s00604-013-1133-1
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发表时间：
2014-02-01
影响因子：
5.7
通讯作者：
Sohrabi, Mahmoud Reza
中科院分区：
文献类型：
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作者：
Sohrabi, Mahmoud Reza
由硫醇改性的二氧化硅纳米颗粒和均苯三甲酸铜（II）配合物获得了一种新型多孔金属有机框架（MOF）。结果表明，这种纳米复合材料是非常适合的汞（II）离子的预富集。采用傅里叶红外光谱、X射线粉末衍射、能量色散X射线衍射和扫描电子显微镜对纳米复合材料进行了表征。考察了pH值、吸附时间、洗脱时间、洗脱剂体积和浓度对吸附效果的影响。研究了吸附平衡等温线，并应用4种模型对吸附平衡数据进行了分析。结果表明，吸附过程符合Langmuir吸附模型。最大单分子膜容量为210 mg·g ~（-1），Langmuir常数为0.273L·mg ~（-1）。新的基于MOF的纳米复合材料被证明是一种有效的和选择性的吸附剂汞（II）。在最佳条件下，Hg（Ⅱ）的检出限为20 pg/mL，相对标准偏差<7.2%（n = 3）。该吸附剂被成功地应用于快速提取汞（II）离子从鱼，沉积物和水样品。
A novel type of porous metal-organic framework (MOF) was obtained from thiol-modified silica nanoparticles and the copper(II) complex of trimesic acid. It is shown that this nanocomposite is well suitable for the preconcentration of Hg(II) ions. The nanocomposite was characterized by Fourier transfer infrared spectroscopy, X-ray powder diffraction, energy-dispersive X-ray diffraction and scanning electron microscopy. The effects of pH value, sorption time, elution time, the volume and concentration of eluent were investigated. Equilibrium isotherms were studied, and four models were applied to analyze the equilibrium adsorption data. The results revealed that the adsorption process obeyed the Langmuir model. The maximum monolayer capacity and the Langmuir constant are 210 mg g(-1) and 0.273 L mg(-1), respectively. The new MOF-based nanocomposite is shown to be an efficient and selective sorbent for Hg(II). Under the optimal conditions, the limit of detection is 20 pg mL(-1) of Hg(II), and the relative standard deviation is < 7.2 % (for n = 3). The sorbent was successfully applied to the rapid extraction of Hg(II) ions from fish, sediment, and water samples.