Engineering a Plasmon-Enhanced Z-Scheme CdIn_2S_4/Bi_2WO_6 Heterojunction for Photoelectrochemical Aptasensing of Bisphenol S AITranslate

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Chinese Library Classification Number:O657.1[理学];TP212[理学—分析化学];X830[理学—化学]

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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/Bi₂WO₆Z-scheme heterojunction to construct a photoelectrochemical(PEC)aptasensor for BPS detection.The Z-scheme configuration between CdIn₂S₄and Bi₂WO₆significantly enhances the PEC response by suppressing recombination of photogenerated electronhole 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 50μM 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.