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<p>Bisphenol S (BPS) is an environmental endocrine disruptor that poses substantial risks to both ecosystems and human health. Its widespread occurrence necessitates the development of sensitive, rapid, cost-effective, and field-deployable analytical tools for environmental monitoring. Herein, we developed a plasmon-enhanced CdIn<sub>2</sub>S<sub>4</sub>/Bi<sub>2</sub>WO<sub>6</sub> Z-scheme heterojunction to construct a photoelectrochemical (PEC) aptasensor for BPS detection. The Z-scheme configuration between CdIn<sub>2</sub>S<sub>4</sub> and Bi<sub>2</sub>WO<sub>6</sub> significantly enhances the PEC response by suppressing recombination of photogenerated electron-hole pairs. Further integration with gold nanoparticles (AuNPs) amplifies the photocurrent through the surface plasmon resonance (SPR) effect, yielding a highly efficient PEC sensing platform. A BPS-specific aptamer was immobilized on the electrode to enable selective target capture. The resulting aptamer-target complex, upon exposure to BPS, impedes interfacial electron transfer, resulting in a concentration-dependent decrease in the photocurrent. The PEC aptasensor exhibited a wide linear detection range of 5 nM to 50 µM and a detection limit of 0.64 nM. The sensor demonstrated high selectivity against structurally similar interfering substances. Application to real water samples yielded results consistent with that of HPLC-MS/MS, confirming the sensor’s reliability and practical applicability. This work establishes a sensitive, rapid, and robust PEC strategy for monitoring BPS in complex environmental matrices with potential for routine environmental analysis.</p>

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Engineering a Plasmon-Enhanced Z-Scheme CdIn2S4/Bi2WO6 Heterojunction for Photoelectrochemical Aptasensing of Bisphenol S

  • 期刊论文

  • 发表日期：

    2025年11月26日

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  • Xiaonan Feng,
  • Kun Zhang,
  • Xiaoduo Chen,
  • Yuemei liang,
  • Ya Hu,
  • Yulu Liu,
  • Chuanzi Gao,
  • Feng Quan,
  • Bintian Zhang

摘要

Bisphenol S (BPS) is an environmental endocrine disruptor that poses substantial risks to both ecosystems and human health. Its widespread occurrence necessitates the development of sensitive, rapid, cost-effective, and field-deployable analytical tools for environmental monitoring. Herein, we developed a plasmon-enhanced CdIn2S4/Bi2WO6 Z-scheme heterojunction to construct a photoelectrochemical (PEC) aptasensor for BPS detection. The Z-scheme configuration between CdIn2S4 and Bi2WO6 significantly enhances the PEC response by suppressing recombination of photogenerated electron-hole pairs. Further integration with gold nanoparticles (AuNPs) amplifies the photocurrent through the surface plasmon resonance (SPR) effect, yielding a highly efficient PEC sensing platform. A BPS-specific aptamer was immobilized on the electrode to enable selective target capture. The resulting aptamer-target complex, upon exposure to BPS, impedes interfacial electron transfer, resulting in a concentration-dependent decrease in the photocurrent. The PEC aptasensor exhibited a wide linear detection range of 5 nM to 50 µM and a detection limit of 0.64 nM. The sensor demonstrated high selectivity against structurally similar interfering substances. Application to real water samples yielded results consistent with that of HPLC-MS/MS, confirming the sensor’s reliability and practical applicability. This work establishes a sensitive, rapid, and robust PEC strategy for monitoring BPS in complex environmental matrices with potential for routine environmental analysis.