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<p>Most of the heavy metals are considered as life-threatening pollutants which are usually found in industrial wastewater and can adversely affect human health and the environment. Chromium among them is highly toxic in Cr(VI) form. It is widely used in various industries like mining, steel, tanneries, chromium plating and other chemical industries. Increased use of chromium in industries, and its toxic effects on human beings, demand an effective method for detection and removal of it. The present study demonstrates the use of a fast, reliable, flexible, and compact-sized electrochemical sensor for the detection of Cr(VI). The sensor was prepared by using reduced graphene oxide (rGO) and modified rGO i.e., Ag/rGO, and Au/rGO electrodes. The structural and morphological characterisation has shown successful synthesis of rGO and its derivatives. The electrochemical characterization by using cyclic voltammetry of Ag/rGO showed a significantly high current than rGO and Au/rGO and was further chosen as an electrode to detect Cr(VI). The Ag/rGO electrode has been fabricated to detect the Cr(VI) and the results are encouraging. The Ag/rGO based electrode was found to detect Cr(VI) at very low concentrations ranging from 1 to 20&#xa0;ppb. The developed sensor was selective to only Cr(VI) when tested for other heavy metal ions such as Cu(II), Co(II), W(VI), Ni(II), Pd(II), Hg(II), Cd(II) and Zn(II).</p>

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Electrochemical sensor for fast and reliable detection of toxic chromium (VI) using graphene-based derivatives

  • 期刊论文

  • 发表日期：

    2025年8月14日

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  • Gautami Kanshetti,
  • Sachin B. Karpe,
  • Nilima S. Rajurkar,
  • Parag V. Adhyapak

摘要

Most of the heavy metals are considered as life-threatening pollutants which are usually found in industrial wastewater and can adversely affect human health and the environment. Chromium among them is highly toxic in Cr(VI) form. It is widely used in various industries like mining, steel, tanneries, chromium plating and other chemical industries. Increased use of chromium in industries, and its toxic effects on human beings, demand an effective method for detection and removal of it. The present study demonstrates the use of a fast, reliable, flexible, and compact-sized electrochemical sensor for the detection of Cr(VI). The sensor was prepared by using reduced graphene oxide (rGO) and modified rGO i.e., Ag/rGO, and Au/rGO electrodes. The structural and morphological characterisation has shown successful synthesis of rGO and its derivatives. The electrochemical characterization by using cyclic voltammetry of Ag/rGO showed a significantly high current than rGO and Au/rGO and was further chosen as an electrode to detect Cr(VI). The Ag/rGO electrode has been fabricated to detect the Cr(VI) and the results are encouraging. The Ag/rGO based electrode was found to detect Cr(VI) at very low concentrations ranging from 1 to 20 ppb. The developed sensor was selective to only Cr(VI) when tested for other heavy metal ions such as Cu(II), Co(II), W(VI), Ni(II), Pd(II), Hg(II), Cd(II) and Zn(II).