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DOI: https://doi.org/10.4491/eer.2019.245
Low cost, highly sensitive and selective electrochemical detection of arsenic (III) using silane grafted based nanocomposite
Jongte Lalmalsawmi1, Diwakar Tiwari1, and Seung-Mok Lee2
1Department of Chemistry, School of Physical Science, Mizoram University, Aizawl-796004, India
2Department of Environmental Engineering, Catholic Kwandong University, Gangneung 25601, Republic of Korea
Corresponding Author: Diwakar Tiwari ,Tel: +91-9862323015, +82-33-649-7535, Email: diw_tiwari@yahoo.com, leesm@cku.ac.kr
Seung-Mok Lee ,Tel: +91-9862323015, +82-33-649-7535, Email: diw_tiwari@yahoo.com, leesm@cku.ac.kr
Received: June 12, 2019;  Accepted: August 12, 2019.
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ABSTRACT
Novel silane grafted bentonite was obtained using the natural bentonite as precursor material. The material which is termed as nanocomposite was characterized by the Fourier Transform Infra-red (FT-IR) and X-ray diffraction (XRD) methods. The surface imaging and elemental mapping was performed using Scanning Electron Microscopic (SEM/EDX) technique. The electroanalytical studies were performed using the nanocomposite electrode. The electroactive surface area of nanocomposite electrode was significantly increased than the pristine bentonite of bare carbon paste electrode. The impedance spectroscopic studies were conducted to simulate the equivalent circuit and Nyquist plots were drawn for the carbon paste electrode and nanocomposite electrodes. A single step oxidation/reduction process occurred for As(III) having E value 0.36 V at pH 2.0. The anodic stripping voltammetry was performed for concentration dependence studies of As(III) (0.5 to 20.0 μg/L) and reasonably a good linear relationship was obtained. The detection limit of the As(III) detection was calculated as 0.003600.00002 μg/L having with observed relative standard deviations (RSD) less than4%.The presence of several cations and anions was not affected the detection of As(III) however, the presence of Cu(II) and Mn(II) affected the detection of As(III). The selectivity of As(III) was achieved using the Tlawng river water sample spiked with As(III). Keywords:
Keywords: As(III) | Detection limit | Electrochemical sensor | Interfering ions | Nanocomposite | Tlawng river water
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