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首页> 外文期刊>International journal of environmental analytical chemistry >Synthesis, characterisation and application of 4-Aminoazobenzene functionalised multiwalled carbon nanotubes as a novel and uniquely selective solid-phase extraction for determination of lead(Ⅱ) in water samples
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Synthesis, characterisation and application of 4-Aminoazobenzene functionalised multiwalled carbon nanotubes as a novel and uniquely selective solid-phase extraction for determination of lead(Ⅱ) in water samples

机译：4-氨基偶氮苯官能化多壁碳纳米管的合成，表征及应用为新型，独特的选择性固相萃取法测定水样中的铅（Ⅱ）

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摘要

Multiwalled carbon nanotubes modified with 4-Aminoazobenzene was prepared and applied to the separation, preconcentration and determination of Pb(Ⅱ) in aqueous solutions by inductively coupled plasma optical emission spectrometry. Characterisation of the surface modification was performed on the basis of transmission electron microscopy, Fourier transform infrared spectra and elemental analysis. The effects of pH, the sample flow rate and volume, the elution condition and the interfering ions were examined using batch and column procedures in detail. Under the optimised conditions (pH 5.0, flow rate 2.0 mL min~(-1)), Pb(Ⅱ) retained on the column can be quantitatively eluted by 2.0 mL 0.1 mol L~(-1) HCl. An enrichment factor of 150 was accomplished. Common interfering ions did not interfere in both the separation and determination. The maximum adsorption capacity of the adsorbent at optimum conditions was found to be 46.8 mg g~(-1). The detection limit (3σ) was 0.28 μg L~(-1), and the relative standard deviation (RSD) was 2.1% (n = 11). The method was validated using certified reference materials, and has been applied for the determination of trace Pb(Ⅱ) with satisfactory results.
机译：制备了4-氨基偶氮苯修饰的多壁碳纳米管，并通过电感耦合等离子体发射光谱法用于水溶液中Pb（Ⅱ）的分离，预富集和测定。表面改性的表征基于透射电子显微镜，傅立叶变换红外光谱和元素分析进行​​。使用分批和色谱柱程序详细检查了pH值，样品流速和体积，洗脱条件和干扰离子的影响。在最佳条件下（pH 5.0，流速2.0 mL min〜（-1）），保留在色谱柱上的Pb（Ⅱ）可以用2.0 mL 0.1 mol L〜（-1）HCl进行定量洗脱。富集因子达到了150。常见的干扰离子不会干扰分离和测定。在最佳条件下，吸附剂的最大吸附容量为46.8 mg g〜（-1）。检出限（3σ）为0.28μgL〜（-1），相对标准偏差（RSD）为2.1％（n = 11）。该方法已通过认证标准物质的验证，已用于痕量铅（Ⅱ）的测定，结果令人满意。

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