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<p>The presence of Hg<sup>2</sup>⁺ and Ag⁺ ions in the environment represents a considerable risk to both human health and ecological systems. Current detection methodologies are typically characterized by their complexity, protracted duration, and inability to simultaneously identify these ions. This study introduces an innovative paper-based colorimetric sensor that employs graphene oxide/platinum-coated gold nanoparticles (GO/Pt@AuNPs) composites, marking the first instance of achieving simultaneous, rapid, low-cost, and visually quantifiable detection of Hg<sup>2</sup>⁺ and Ag⁺. The sensor capitalizes on the peroxidase-like activity of GO/Pt@AuNPs to facilitate the oxidation of tetramethylbenzidine (TMB) by hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>), resulting in the production of a blue chromophore. The catalytic activity is selectively inhibited by Hg<sup>2</sup>⁺ and Ag⁺ ions, which leads to a decrease in color intensity that is directly proportional to the concentration of the ions. For quantitative analysis, Hg<sup>2</sup>⁺ was selectively masked using ethylenediaminetetraacetic acid (EDTA). Experimental findings have indicated detection limits of 0.05&#xa0;μM for Hg<sup>2</sup>⁺ and 2.5&#xa0;μM for Ag⁺, with a detection time of merely 1&#xa0;min. This method is distinguished by its high selectivity, portability, and capability for naked-eye quantification, rendering it particularly suitable for the rapid on-site detection of Hg<sup>2</sup>⁺ and Ag⁺ in environmental water, food, and biological samples. This is an effective approach for monitoring pollutants in settings with limited resources.</p>

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Paper-based colorimetric sensor based on graphene oxide/platinum-gold nanocomposites for simultaneous detection of Hg2⁺ and Ag⁺

  • 期刊论文

  • 发表日期：

    2025年4月10日

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  • Yanping Qu,
  • Ibrahim Yakub,
  • Rubiyah Baini,
  • Yanqiu Qu,
  • Hongcui Li,
  • Lin Lin,
  • Yuchang Wang,
  • Shenxue Wang,
  • Mohamad Hardyman Barawi,
  • Xiaoyan Ma

摘要

The presence of Hg2⁺ and Ag⁺ ions in the environment represents a considerable risk to both human health and ecological systems. Current detection methodologies are typically characterized by their complexity, protracted duration, and inability to simultaneously identify these ions. This study introduces an innovative paper-based colorimetric sensor that employs graphene oxide/platinum-coated gold nanoparticles (GO/Pt@AuNPs) composites, marking the first instance of achieving simultaneous, rapid, low-cost, and visually quantifiable detection of Hg2⁺ and Ag⁺. The sensor capitalizes on the peroxidase-like activity of GO/Pt@AuNPs to facilitate the oxidation of tetramethylbenzidine (TMB) by hydrogen peroxide (H2O2), resulting in the production of a blue chromophore. The catalytic activity is selectively inhibited by Hg2⁺ and Ag⁺ ions, which leads to a decrease in color intensity that is directly proportional to the concentration of the ions. For quantitative analysis, Hg2⁺ was selectively masked using ethylenediaminetetraacetic acid (EDTA). Experimental findings have indicated detection limits of 0.05 μM for Hg2⁺ and 2.5 μM for Ag⁺, with a detection time of merely 1 min. This method is distinguished by its high selectivity, portability, and capability for naked-eye quantification, rendering it particularly suitable for the rapid on-site detection of Hg2⁺ and Ag⁺ in environmental water, food, and biological samples. This is an effective approach for monitoring pollutants in settings with limited resources.