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<p>Heavy metal pollution, particularly lead (Pb²⁺), poses significant environmental and health risks, necessitating the development of sensitive and selective detection methods. In this study, Near-Infrared (NIR)-sensitive nanomotors based on polydopamine (PDA) nanobowl (NB) structures were synthesized and functionalized with PEDOT: PSS (poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate)) to enhance their detection capabilities. The PDA/PEDOT: PSS composite nanomotors demonstrated high sensitivity and selectivity for Pb²⁺ ions, with a detection limit (LoD) of 0.18 µM, significantly improving upon the 2.5 µM LoD of unmodified PDA nanomotors. The interaction of Pb²⁺ ions with the nanomotors was characterized by a reduction in their speed under NIR light, as well as by electrochemical methods, including cyclic voltammetry. The PDA/PEDOT: PSS composite nanomotors exhibited superior selectivity for Pb²⁺ over other heavy metals (Cd²⁺, Co²⁺, Cu²⁺), with interference studies confirming their high specificity. Structural and compositional analyses using SEM, EDS, and zeta potential measurements validated the successful functionalization of PDA with PEDOT: PSS and the effective binding of Pb²⁺ ions. This innovative nanomotor design offers a promising approach for the sensitive detection and removal of Pb²⁺ ions from water, contributing to advancements in environmental monitoring and heavy metal remediation.</p>

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PDA/PEDOT: PSS composite nanomotors for determination of Pb2+ ions

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • Semanur Özcan Özseven,
  • Ayşegül Türker,
  • Gözde Yurdabak Karaca,
  • Ayşegül Uygun Öksüz

摘要

Heavy metal pollution, particularly lead (Pb²⁺), poses significant environmental and health risks, necessitating the development of sensitive and selective detection methods. In this study, Near-Infrared (NIR)-sensitive nanomotors based on polydopamine (PDA) nanobowl (NB) structures were synthesized and functionalized with PEDOT: PSS (poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate)) to enhance their detection capabilities. The PDA/PEDOT: PSS composite nanomotors demonstrated high sensitivity and selectivity for Pb²⁺ ions, with a detection limit (LoD) of 0.18 µM, significantly improving upon the 2.5 µM LoD of unmodified PDA nanomotors. The interaction of Pb²⁺ ions with the nanomotors was characterized by a reduction in their speed under NIR light, as well as by electrochemical methods, including cyclic voltammetry. The PDA/PEDOT: PSS composite nanomotors exhibited superior selectivity for Pb²⁺ over other heavy metals (Cd²⁺, Co²⁺, Cu²⁺), with interference studies confirming their high specificity. Structural and compositional analyses using SEM, EDS, and zeta potential measurements validated the successful functionalization of PDA with PEDOT: PSS and the effective binding of Pb²⁺ ions. This innovative nanomotor design offers a promising approach for the sensitive detection and removal of Pb²⁺ ions from water, contributing to advancements in environmental monitoring and heavy metal remediation.