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<p>This study for the first time proposes a green pathway for the development of a highly sensitive and selective As(III) sensor based on biogenically synthesized gold nanoparticles (GNPs) decorated on a halloysite nanotube/carbon (HNT/C) composite. The green synthesis method employed for GNPs decoration offers a sustainable alternative to conventional preparation techniques. The resulting HNT/C@GNPs modifier was then incorporated into a carbon paste electrode (CPE) to form an enhanced electrochemical sensing system. The systematic investigation of critical parameters including buffer pH, modifier dosage, and buffer composition was conducted to achieve the maximize performance HNT/C@GNPs-CPE. The sensor exhibited a wide linear calibration range from 0.8 to 110 ng mL⁻¹ for As(III) detection, with an impressive detection limit of 0.15 ng mL⁻¹ (3σ) by differential pulse voltammetry (DPV) method. The HNT/C@GNPs-CPE demonstrated remarkable selectivity against potential interfering heavy metal ions, including Pb(II), Cd(II), Hg(II), Cr(III), Ni(II), Ag(I), and Co(II), highlighting its specificity for As(III) determination. The practical applicability of the HNT/C@GNPs-CPE was validated through successful measurement of As(III) in real environmental water samples employing the standard addition method.</p>

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Biogenic Preparation of Gold Nanoparticles on Clay-Carbon Composite for Electrochemical Determination of As(III) in Environmental Waters

  • 期刊论文

  • 发表日期：

    2025年3月15日

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  • Hao Xin,
  • Tingzhou Zhang

摘要

This study for the first time proposes a green pathway for the development of a highly sensitive and selective As(III) sensor based on biogenically synthesized gold nanoparticles (GNPs) decorated on a halloysite nanotube/carbon (HNT/C) composite. The green synthesis method employed for GNPs decoration offers a sustainable alternative to conventional preparation techniques. The resulting HNT/C@GNPs modifier was then incorporated into a carbon paste electrode (CPE) to form an enhanced electrochemical sensing system. The systematic investigation of critical parameters including buffer pH, modifier dosage, and buffer composition was conducted to achieve the maximize performance HNT/C@GNPs-CPE. The sensor exhibited a wide linear calibration range from 0.8 to 110 ng mL⁻¹ for As(III) detection, with an impressive detection limit of 0.15 ng mL⁻¹ (3σ) by differential pulse voltammetry (DPV) method. The HNT/C@GNPs-CPE demonstrated remarkable selectivity against potential interfering heavy metal ions, including Pb(II), Cd(II), Hg(II), Cr(III), Ni(II), Ag(I), and Co(II), highlighting its specificity for As(III) determination. The practical applicability of the HNT/C@GNPs-CPE was validated through successful measurement of As(III) in real environmental water samples employing the standard addition method.