A glassy carbon electrode modified with bismuth nanotubes in a silsesquioxane framework for sensing of trace lead and cadmium by stripping voltammetry

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• 作者：Yusong Li (2)
  Guangqiang Sun (1)
  Yuehua Zhang (1)
  Cunwang Ge (1)
  Ning Bao (3)
  Yihong Wang (2)
  
• 关键词：Bismuth nanotubes ; Silsesquioxane ; Lead ; Cadmium ; Stripping voltammetry
• 刊名：Microchimica Acta
• 出版年：2014
• 出版时间：June 2014
• 年：2014
• 卷：181
• 期：7-8
• 页码：751-757
• 全文大小：
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• 作者单位：Yusong Li (2)
  Guangqiang Sun (1)
  Yuehua Zhang (1)
  Cunwang Ge (1)
  Ning Bao (3)
  Yihong Wang (2)
  
  2. Department of Chemistry and Chemical Engineering, Southeast University, Nanjing, 210092, Jiangsu, People’s Republic of China
  1. School of Chemistry and Chemical Engineering, Nantong University, Nantong, 226019, Jiangsu, People’s Republic of China
  3. School of Public Health, Nantong University, Nantong, 226019, Jiangsu, People’s Republic of China
  
• ISSN：1436-5073

文摘

Single-walled bismuth nanotubes (sw-BiNTs) were self-assembled with octa(3-aminopropyl) silsesquioxane as a framework and to govern morphology. Deposited on a glassy carbon electrode (GCE), the sw-BiNTs were used for the simultaneous analysis of Pb(II) and Cd(II) by square wave stripping voltammetry. The sw-BiNTs were prepared by (a) coordination interaction between the amino groups of the silsesquioxane and the Bi(III) ions, and by (b) reduction with sodium borohydride. Transmission electron microscopy images revealed single-walled tubular structures with diameters of ~4-?nm, and with lengths of several hundreds nanometers. GCEs modified with such sw-BiNTs perform much better than bare GCEs in stripping analysis of Pb(II) and Cd(II). The effects of adsorption quantity of sw-BiNTs, solution pH, pulse amplitude, and pulse width were optimized. The modified electrode was then used for the analysis of Pb(II) and Cd(II) in a linear response range from 0.4 to 6?μM with a sensitivity of 4.692?μA?μM? and 3.835?μA?μM?, and detection limits of 1?nM and 5?nM, respectively. The method was successfully applied to the analysis of Pb(II) and Cd(II) in toy leachates, and the results were in good agreement with those obtained with atomic absorption spectrometry. Sensitivity and detection limits were compared with other voltammetric methods, and the sw-BiNTs are deemed to be an attractive alternative for practical applications. Other features of the electrode include low costs, a well reproducible nanostructure, and ease of scale-up of the fabrication process. Figure Single-walled bismuth nanotubes (BiNTs) were self-assemblied with octa(3-aminopropyl) silsesquioxane as framework and morphology control agent for the simultaneous detection of trace Pb(II) and Cd(II) by square wave stripping voltammetry. The proposal preparation avoids time-consuming pre-treatment and experienced operation. The sensitivity and detection limit of the method was comparable to reported voltammetric methods, and BiNTs might be an alternative candidate for practical applications of electrochemical detection.