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首页> 外文期刊>Ionics >Amperometric determination of nanomolar mercury(II) by layered double nanocomposite of zinc/aluminium hydroxide-3(4-methoxyphenyl)propionate modified single-walled carbon nanotube paste electrode
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Amperometric determination of nanomolar mercury(II) by layered double nanocomposite of zinc/aluminium hydroxide-3(4-methoxyphenyl)propionate modified single-walled carbon nanotube paste electrode

机译：锌/氢氧化铝-3（4-甲氧基苯基）丙酸酯修饰的单壁碳纳米管糊状电极的双层双纳米复合材料安培测定纳摩尔汞（II）

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摘要

A mercury(II) sensor was developed by using single-walled carbon nanotube (SWCNT) paste electrode modified with layered double Zn/Al hydroxide-3(4-methoxyphenyl)propionate nanocomposite (Zn/Al-LDH-MPP). The cyclic voltammetry was optimised at electrode composition 2.5 % (w/w) of Zn/Al-LDH-MPP/SWCNTs, supporting electrolyte 0.4 M potassium chloride, buffering at pH 4.0 and scan rate of 100 mVs(-1). The sensor exhibited a wide linear range from 1 x 10(-3) M to 1 x 10(-7) M Hg2+ and 1 x 10(-7) M to 1 x 10(-9) M Hg2+ with a detection limit of 1 x 10(-9) M Hg2+. The values of the diffusion coefficients (1.5445 x 10(-9) cm(2) s(-1)), surface charge (524.5 mu C s(-1/2)) and surface coverage (4.41 x 10(-2) mol cm(-2)) determined by double potential-step chronocoulometry could probably have contributed to the high sensitivity value obtained. The presence of 25-fold concentration of all metal ions tested showed no influence on the anodic peak current. The electrode was then proposed as the appropriate alternative for the determination of mercury(II).
机译：通过使用单层碳纳米管（SWCNT）糊状电极开发了汞（II）传感器，该电极经层状双Zn / Al氢氧化物-3（4-甲氧基苯基）丙酸酯纳米复合材料（Zn / Al-LDH-MPP）修饰。循环伏安法在Zn / Al-LDH-MPP / SWCNT的电极组成为2.5％（w / w），支持电解质0.4 M氯化钾，pH 4.0缓冲和100 mVs（-1）扫描速率的条件下进行了优化。该传感器的线性范围从1 x 10（-3）M到1 x 10（-7）M Hg2 +和1 x 10（-7）M到1 x 10（-9）M Hg2 +，检测极限为1个10（-9）M Hg2 +。扩散系数（1.5445 x 10（-9）cm（2）s（-1）），表面电荷（524.5μC s（-1/2））和表面覆盖率（4.41 x 10（-2））的值mol cm（-2））通过双电势步计时库仑法测定可能可能有助于获得高灵敏度值。所测试的所有金属离子的浓度都是25倍，对阳极峰值电流没有影响。然后建议使用该电极作为测定汞（II）的适当替代方法。

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