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首页> 外文期刊>Comptes Rendus Chimie >An inorganic-organic hybrid material from the co-intercalation of a cationic surfactant and thiourea within montmorillonite layers: application to the sensitive stripping voltammetric detection of Pb2+ and Cd2+ ions
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An inorganic-organic hybrid material from the co-intercalation of a cationic surfactant and thiourea within montmorillonite layers: application to the sensitive stripping voltammetric detection of Pb2+ and Cd2+ ions

机译：蒙脱土层中共嵌入阳离子表面活性剂和硫脲的无机-有机杂化材料：在灵敏溶出伏安法检测Pb2 +和Cd2 +离子中的应用

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摘要

A smectite-based inorganic-organic hybrid material was prepared by a one-step intercalation of cetyltrimethylammonium ions and thiourea within the interlayer space of montmorillonite (MT). The surface and textural properties of the resulting material were examined using several techniques (X-ray diffraction, elementary analysis and N-2 adsorption-desorption experiments (BET method)) that demonstrated the presence of both modifiers in the clay mineral structure. The presence of thiourea molecules in the modified MT greatly improved its ability towards the fixation of Pb2+ and Cd-2+ ions when the organoclay material was used for sensing purposes as a glassy carbon electrode modifier. The electro-analytical procedure was based on the chemical accumulation of both analytes under open-circuit conditions, followed by the detection of the pre-concentrated species using square wave voltammetry. Upon optimization of different parameters likely to influence the electrode response, linear calibration graphs were obtained in the concentration ranges from 0.1 to 1 mu M and 0.01 to 0.1 mu M for Cd2+ and Pb2+, respectively, leading to low limits of detection (4.2 x 10(-1) M for Pb2+ and 1.2 x 10(-9) M for Cd2+). (C) 2015 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
机译：通过在蒙脱土（MT）的层间空间内一步插入十六烷基三甲基铵离子和硫脲，制备了基于蒙脱石的无机-有机杂化材料。使用多种技术（X射线衍射，元素分析和N-2吸附-解吸实验（BET方法））检查了所得材料的表面和质地特性，这些技术证明了粘土矿物结构中两种改性剂的存在。当有机粘土材料用作玻璃碳电极修饰剂时，硫脲分子在改性MT中的存在大大提高了其固定Pb2 +和Cd-2 +离子的能力。电分析程序是基于两种分析物在开路条件下的化学积累，然后使用方波伏安法检测预浓缩的物质。在优化可能影响电极响应的不同参数后，分别获得了Cd2 +和Pb2 +浓度范围为0.1至1μM和0.01至0.1μM的线性校准图，从而导致较低的检测限（4.2 x 10 （-1）M用于Pb2 +，1.2 x 10（-9）M用于Cd2 +）。 （C）2015年科学研究院。由Elsevier Masson SAS发布。版权所有。

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