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首页> 外文期刊>Environmental Science: Nano >Synthesis of Cu_xNi_((1-x))O coral-like nanostructures and their application in the design of a reusable toxic heavy metal ion sensor based on an adsorption-mediated electrochemical technique
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Synthesis of Cu_xNi_((1-x))O coral-like nanostructures and their application in the design of a reusable toxic heavy metal ion sensor based on an adsorption-mediated electrochemical technique

机译：基于吸附介导的电化学技术的可重复使用有毒重金属离子传感器设计及其在可重复使用的有毒重金属离子传感器设计中的合成及其应用

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摘要

Nickel oxide, and non-stoichiometric and Cu-doped variants (NiO, Ni2O3 and Cu_xNi_((1-x))O) possessing porous coral-like nanostructures, were prepared by a facile, low temperature, hydrothermal approach. Structural and morphological characterization was performed by X-ray diffractometry, X-ray photoelectron spectroscopy and FESEM imaging. The Cu-doped oxide was found to possess lattice strain which resulted in the induction of surface defects. The prepared materials were used as sensing materials for toxic Cr(VI) ions in aqueous medium. A novel sensing technique was proposed based on adsorption, which was found to be more effective in terms of reproducibility and reusability of the sensor than the conventional electrochemical sensing technique. The sensing mechanism was explained based on the phenomenon of adsorption. This makes the efficiency of the sensor surface-dependent rather than chemical reactivity-dependent, thereby making it a non-destructive sensing technique. The Cu-doped NiO nanostructure (10% Cu doping) was found to show maximum sensitivity (252.62 at 1 ppm) and high selectivity, together with a low response time (~2 s), towards Cr(VI) ions relative to Cd(II), As(v) and Pb(n) ions. This was due to its enhanced surface properties compared with its un-doped variants. The effect of Cu doping on the nanostructure morphology and consequently on sensor efficiency was also studied. The limit of detection was found to be 1 ppm (1 mg L~(-1)) of Cr(VI) ions in aqueous solution. This material, along with the technique proposed, can thus be advantageous for the cost-efficient monitoring of water quality and drinking water standards.
机译：通过容易，低温，水热法制备具有多孔珊瑚状纳米结构的氧化镍和非化学计量和Cu掺杂的变体（NiO，Ni 2 O 3和Cu_xNi _（（1-x））O）。通过X射线衍射法，X射线光电子体光谱和雌性成像进行结构和形态学表征。发现Cu掺杂的氧化物具有晶格菌株，导致表面缺陷的诱导。将制备的材料用作在水性介质中的毒性Cr（VI）离子的感测材料。基于吸附提出了一种新的传感技术，该方法在传感器的再现性和可重复使用方面被发现比传统的电化学传感技术更有效。基于吸附现象解释了传感机制。这使得传感器表面相关的效率而不是依赖于化学反应性，从而使其成为非破坏性的传感技术。发现Cu掺杂的NiO纳米结构（10％Cu掺杂）显示最大灵敏度（1ppm以1ppm）和高选择性，以及相对于Cd的低响应时间（〜2s），以及朝向Cr（Vi）离子的低响应时间（〜2s）（ II），As（v）和pb（n）离子。与其未掺杂的变体相比，这是由于其增强的表面性能。还研究了Cu掺杂对纳米结构形态的影响，从而研究了传感器效率。发现检测极限是水溶液中的Cr（VI）离子的1ppm（1mg L〜（-1））。因此，这种材料以及所提出的技术可以是有利的水质和饮用水标准的经济效率监测。

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  • 来源
    《Environmental Science: Nano》 |2017年第1期|共12页
  • 作者

    Sayan Dey; Sumita Santra; Anupam Midya;

  • 作者单位

    Department of Electronics &

    Electrical Communication Engineering Indian Institute of Technology Kharagpur India;

    Department of Physics Indian Institute of Technology Kharagpur 721302 India.;

    School of Nanoscience &

    Technology Indian Institute of Technology Kharagpur India;

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  • 正文语种 eng
  • 中图分类 环境科学、安全科学;
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