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<p>Cu<sub>2</sub>O was synthesized via chemical precipitation at room temperature using ascorbic acid as the reducing agent and various copper precursors, including Cu(NO<sub>3</sub>)<sub>2</sub>·3H<sub>2</sub>O, CuSO<sub>4</sub>·5H<sub>2</sub>O, CuCl<sub>2</sub>·2H<sub>2</sub>O, and Cu(Ac)<sub>2</sub>·H<sub>2</sub>O. The structural and photoelectric properties of the synthesized Cu<sub>2</sub>O were measured. Photocatalytic removal of hexavalent uranium (U(VI)) was evaluated under visible light irradiation without the addition of sacrificial agents. The results showed that Cu<sub>2</sub>O (Cu<sub>2</sub>O-NR) synthesized with Cu(NO<sub>3</sub>)<sub>2</sub>·3H<sub>2</sub>O had an optimal removal efficiency of 97.8% within 180&#xa0;min of illumination. This is attribute to its large specific surface area (52.24 m<sup>2</sup>/g), low charge transfer resistance, and excellent separation efficiency of photogenerated carriers. Furthermore, a possible photocatalytic mechanism was proposed. In summary, Cu(NO<sub>3</sub>)<sub>2</sub>·3H<sub>2</sub>O is as the most suitable precursor for preparing Cu<sub>2</sub>O by chemical precipitation method, enabling efficient photocatalytic removal of U(VI).</p>

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Effect of different precursor anions on photocatalytic removing U(VI) performance of Cu2O

  • 期刊论文

  • 发表日期：

    2025年7月29日

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  • Lingshan Xiong,
  • Youqun Wang,
  • Weiqian Cai,
  • Zhibin Zhang,
  • Xiaohong Cao,
  • Yunhai Liu

摘要

Cu2O was synthesized via chemical precipitation at room temperature using ascorbic acid as the reducing agent and various copper precursors, including Cu(NO3)2·3H2O, CuSO4·5H2O, CuCl2·2H2O, and Cu(Ac)2·H2O. The structural and photoelectric properties of the synthesized Cu2O were measured. Photocatalytic removal of hexavalent uranium (U(VI)) was evaluated under visible light irradiation without the addition of sacrificial agents. The results showed that Cu2O (Cu2O-NR) synthesized with Cu(NO3)2·3H2O had an optimal removal efficiency of 97.8% within 180 min of illumination. This is attribute to its large specific surface area (52.24 m2/g), low charge transfer resistance, and excellent separation efficiency of photogenerated carriers. Furthermore, a possible photocatalytic mechanism was proposed. In summary, Cu(NO3)2·3H2O is as the most suitable precursor for preparing Cu2O by chemical precipitation method, enabling efficient photocatalytic removal of U(VI).