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首页> 外文期刊>Advanced Functional Materials >Preparation, Characterization, and Application of L-Cysteine Functionalized Multiwalled Carbon Nanotubes as a Selective Sorbent for Separation and Preconcentration of Heavy Metals
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Preparation, Characterization, and Application of L-Cysteine Functionalized Multiwalled Carbon Nanotubes as a Selective Sorbent for Separation and Preconcentration of Heavy Metals

机译：L-半胱氨酸官能化多壁碳纳米管的制备，表征和应用作为选择性吸附剂用于重金属的分离和预富集

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摘要

L-cysteine functionalized multi-walled carbon nanotubes (MWCNTs-cysteine) are synthesized and characterized by XPS, FT-IR, XRD, and TEM. The capability of MWCNTs-cysteine for selective separation and preconcentration of heavy metal ions are statically and dynamically evaluated with Cd~(2+) as a model heavy metal ion. Unlike MWCNTs, the sorption of Cd~(2+) onto MWCNTs-cysteine is not influenced by ionic strength in a wide range. The MWCNTs-cysteine is demonstrated to be good column packings for on-line microcolumn separation and preconcentration of Cd~(2+). Effective preconcentration of Cd~(2+) on the MWCNTs-cysteine packed microcolumn is achieved in a pH range of 5.5 to 8.0. The retained Cd~(2+) is efficiently eluted with 0.5 mol L~(-1) HC1 for on-line flame atomic absorption spectrometric determination. The MWCNTs-cysteine exhibit fairly fast kinetics for the adsorption of Cd~(2+), and offer up to 1600-fold improvement of the tolerable concentrations of co-existing metal ions over the MWCNTs for on-line solid-phase extraction of Cd~(2+). With a preconcentration time of 60 s at a sample loading flow rate of 5.0mL min~(-1), an enhancement factor of 33 and a sample throughput of 36 h~(-1) along with a detection limit (3s) of 0.28 ugL~(-1) are obtained. The precision (RSD) for 11 replicate measurements is 1.6% at the 10ug L~(-1) level. The developed method using the MWCNTs-cysteine as sorbent is successfully applied to determination of trace cadmium in a variety of biological and environmental materials.
机译：合成了L-半胱氨酸官能化的多壁碳纳米管（MWCNTs-半胱氨酸），并通过XPS，FT-IR，XRD和TEM对其进行了表征。以Cd〜（2+）为模型重金属离子，静态，动态地评价了MWCNTs-半胱氨酸对重金属离子的选择性分离和富集能力。与MWCNTs不同，Cd〜（2+）在MWCNTs-半胱氨酸上的吸附不受很大范围内离子强度的影响。 MWCNTs-半胱氨酸被证明是用于在线微柱分离和Cd〜（2+）的预浓缩的良好柱填料。在pH范围为5.5至8.0的情况下，在MWCNTs-半胱氨酸填充的微柱上有效地富集了Cd〜（2+）。残留的Cd〜（2+）用0.5 mol L〜（-1）HCl有效洗脱，用于在线火焰原子吸收光谱法测定。 MWCNTs-半胱氨酸对Cd〜（2+）的吸附具有相当快的动力学，与在线固相萃取Cd相比，MWCNTs的共存金属离子的容许浓度提高了1600倍。 〜（2+）。样品加载流速为5.0mL min〜（-1）时预浓缩时间为60 s，增强因子为33，样品通量为36 h〜（-1），检测限（3s）为0.28得到ugL〜（-1）。在10ug L〜（-1）的水平下，11次重复测量的精度（RSD）为1.6％。所开发的以多壁碳纳米管-半胱氨酸为吸附剂的方法已成功地用于测定多种生物和环境材料中的痕量镉。

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