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<p>To overcome the narrow visible-light harvesting of graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>), a thiophene-functionalized copolymer (CNTA) was synthesized via nucleophilic polycondensation of urea with 3-thiophenecarboxylic acid (3-ThA). The covalent insertion of thiophene rings into the heptazine framework extends the π-conjugation, facilitates photogenerated charge transport and separation, and red-shifts the optical absorption edge, leading to markedly enhanced photoresponse under visible light. The optimized CNTA<sub>0.1</sub> removes 96% of U(VI) within 80&#xa0;min of irradiation, exhibiting a 2.4-fold increase in activity relative to pristine g-C<sub>3</sub>N<sub>4</sub>, and retains high performance after four consecutive cycles. This organic-chemical modification strategy offers a metal-free pathway for engineering polymeric photocatalysts toward efficient U(VI) photoreduction.</p>

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Thiophene-copolymerized graphitic carbon nitride for efficient photocatalytic U(VI) reduction

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • Yean Zhu,
  • Baosheng Yang,
  • Xiaozhao Tian,
  • Jing Xiang,
  • Zongbo Xie,
  • Zhanggao Le

摘要

To overcome the narrow visible-light harvesting of graphitic carbon nitride (g-C3N4), a thiophene-functionalized copolymer (CNTA) was synthesized via nucleophilic polycondensation of urea with 3-thiophenecarboxylic acid (3-ThA). The covalent insertion of thiophene rings into the heptazine framework extends the π-conjugation, facilitates photogenerated charge transport and separation, and red-shifts the optical absorption edge, leading to markedly enhanced photoresponse under visible light. The optimized CNTA0.1 removes 96% of U(VI) within 80 min of irradiation, exhibiting a 2.4-fold increase in activity relative to pristine g-C3N4, and retains high performance after four consecutive cycles. This organic-chemical modification strategy offers a metal-free pathway for engineering polymeric photocatalysts toward efficient U(VI) photoreduction.