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<p>Visible-light-driven photocatalysis has emerged as a promising approach for the efficient removal of U(VI) from wastewater. In this work, Pt quantum dots (PQD) were synthesized via NaBH<sub>4</sub> reduction and subsequently anchored onto g-C<sub>3</sub>N<sub>4</sub> nanosheets (CNs) to fabricate PQD<sub>n</sub>-CNs composite photocatalysts (where n denotes the mass fraction of PQD), aiming to enhance the photocatalytic activity of pristine CNs. The morphology, chemical composition and optical properties of PQD<sub>n</sub>-CNs composites were systematically characterized using various techniques. Notably, PQD<sub>3</sub>-CNs exhibited 97.9% U(VI) removal efficiency after 60&#xa0;min of dark reaction and 150&#xa0;min of visible light irradiation, representing a 2.45-fold enhancement compared to bare CNs. Furthermore, PQD<sub>3</sub>-CNs demonstrated excellent stability and recyclability over five cycles. Mechanistically, radical scavenging experiments revealed that photogenerated electron (e<sup>−</sup>) and superoxide radicals (•O<sub>2</sub><sup>−</sup>) synergistically facilitated U(VI) reduction, elucidating the underlying photocatalytic pathway. Overall, the PQDₙ-CNs photocatalyst holds promise for providing novel insights into the treatment of radionuclide-contaminated wastewater.</p>

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LSPR-enhanced photocatalytic reduction of U(VI) over Pt quantum dots decorated g-C3N4 nanosheets under visible light

  • 期刊论文

  • 发表日期：

    2026年2月14日

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  • Zhongping Cheng,
  • Jian Ren,
  • Zhimin Dong,
  • Yingcai Wang,
  • Youqun Wang,
  • Xiaohong Cao,
  • Zhibin Zhang,
  • Yunhai Liu

摘要

Visible-light-driven photocatalysis has emerged as a promising approach for the efficient removal of U(VI) from wastewater. In this work, Pt quantum dots (PQD) were synthesized via NaBH4 reduction and subsequently anchored onto g-C3N4 nanosheets (CNs) to fabricate PQDn-CNs composite photocatalysts (where n denotes the mass fraction of PQD), aiming to enhance the photocatalytic activity of pristine CNs. The morphology, chemical composition and optical properties of PQDn-CNs composites were systematically characterized using various techniques. Notably, PQD3-CNs exhibited 97.9% U(VI) removal efficiency after 60 min of dark reaction and 150 min of visible light irradiation, representing a 2.45-fold enhancement compared to bare CNs. Furthermore, PQD3-CNs demonstrated excellent stability and recyclability over five cycles. Mechanistically, radical scavenging experiments revealed that photogenerated electron (e−) and superoxide radicals (•O2−) synergistically facilitated U(VI) reduction, elucidating the underlying photocatalytic pathway. Overall, the PQDₙ-CNs photocatalyst holds promise for providing novel insights into the treatment of radionuclide-contaminated wastewater.