Voltammetric Determination of Pb(II) Ions at a Modified Kaolinite-Carbon Paste Electrode

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13 Citations (Scopus)

Abstract

We report a novel application of a carbon paste electrode modified with sodium dodecyl sulphate (SDS) intercalated kaolin clay for the electrochemical detection of Pb2+in aqueous medium using square wave voltammetry. SDS was used to modify a chemically purified kaolin clay via intercalation process to prepare a carbon paste electrode. The SDS kaolin clay was obtained by intercalation of SDS into the interlayer spaces of kaolinite in the presence of heat. The purified kaolinite and its SDS intercalate were characterised using techniques such as X-ray powder diffraction (XRD), X-ray fluorescence (XRF), thermogravimetric analysis (TGA), attenuated total reflection Fourier transform infrared (ATR-FTIR), scanning electron microscopy (SEM), BET and CHNS elemental analysis. These techniques proved the successful intercalation of SDS into the interlayer spaces of the clay adsorbent. Various parameters affecting the electrochemical detection of Pb2+ were optimised. A linear current response was obtained in the concentration range of 1–100 ppb. The limit of detection was found to be 2.48 ppb. The proposed sensor also demonstrates good reproducibility after series of 10 repetitive measurements with a relative standard deviation (RSD) of about 6.30%. The interfering effects of some ions on the detection of Pb2+ were evaluated. The proposed sensor was applied for the determination of Pb2+ in a real water sample. [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)643-652
Number of pages10
JournalElectrocatalysis
Volume10
Issue number6
DOIs
Publication statusPublished - 1 Nov 2019

Keywords

  • Carbon paste electrode
  • Clay minerals
  • Intercalation
  • Lead
  • Purified kaolinite clay
  • Sodium dodecyl sulphate–purified kaolinite clay

ASJC Scopus subject areas

  • Electrochemistry

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