Fabrication of an Innovative Lead-Ions Sensitive Electrode Based on Thio-semicarbazide Derivative Modified Nanoporous Silicon

Author(s): Shaoyuan Li, Wenhui Ma, Xiuhua Chen, Cong Zhang, Xiao He, Yudong Shang, Yuxin Zou, Zhengjie Chen.

Journal Name: Current Environmental Engineering

Volume 3 , Issue 3 , 2016

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Abstract:

Background: The detection of heavy metals in the environment is of great importance due to their high toxicity.

Methods: A multi-step graft route was designed for anchoring thiosemicarbazide derivative (TSCD) groups onto the porous silicon (PS) surface. The reaction efficiency at each step functionalization was confirmed using FT-IR spectra, and the XPS analysis results confirmed the modification of thiosemicarbazide derivative. The morphology change of the modified PS was studied by AFM characterization.

Results: The results display that the currents of Pb0 oxidation increase with the accumulated Pb2+ concentration and the TSCD-PS has a strongest sensitive to Pb2+ at pH = 4.0. The results display that the anodic peak current densities increase with the increasing Pb2+ concentration and they have a good fitting with a second order exponential function of I = -156exp(-1562[Pb2+]) - 260exp(-105 [Pb2+]) + 446 (R2 = 0.99).

Conclusion: The TSCD-PS shows the property to determinate Pb2+ in aqueous solution, which demonstrates that the modified PS is expected to be a promising platform for detecting toxic metal ions.

Keywords: Covalent modification, FT-IR, ions sensor, lead ions detection, porous silicon, TSCD-PS.

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Article Details

VOLUME: 3
ISSUE: 3
Year: 2016
Page: [267 - 272]
Pages: 6
DOI: 10.2174/2212717803666160725152731
Price: $58

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