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<p>Catalysis was an effective method for uranium recovery and environmental remediation. However, the weak flexoelectric response, despite being universal in dielectric materials, greatly limited its appeal for research and catalytic applications. Here, we proposed a strategy to enhance the flexoelectric response by bridging inorganic chains with metal-organic chains within the structure. The resulting hybrid material, Co[C<sub>4</sub>H<sub>4</sub>N<sub>2</sub>]V<sub>2</sub>O<sub>6</sub>, demonstrated excellent uranyl removal performance, surpassing that of state-of-the-art piezocatalysts. Co[C<sub>4</sub>H<sub>4</sub>N<sub>2</sub>]V<sub>2</sub>O<sub>6</sub> showed flexocatalytic uranyl activity across a broad pH range and under high-salinity conditions. Under a dynamic experimental setup, Co[C<sub>4</sub>H<sub>4</sub>N<sub>2</sub>]V<sub>2</sub>O<sub>6</sub> showed strong potential for practical flexocatalytic applications. Co[C<sub>4</sub>H<sub>4</sub>N<sub>2</sub>]V<sub>2</sub>O<sub>6</sub> could efficiently separate uranyl in contaminated potable water, reducing the uranium concentration (~2.0 ppm) to below the drinking water standard (30 ppb). It could also lower the uranium concentration (~5.6 ppm) in mining wastewater to below the discharge limit (300 ppb). Its intrinsic anisotropic mechanical properties and cantilever-like morphology endowed high deformability, which, together with a large dielectric constant, enhanced its flexoelectric polarization. The revealed flexocatalytic mechanism confirmed that uranyl was converted into insoluble (UO<sub>2</sub>)O<sub>2</sub>·2H<sub>2</sub>O by active species generated through dynamic polarization. This work provided a promising avenue for the design of advanced flexocatalysts and offered an effective strategy for uranium recovery and environmental remediation.</p>

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Highly flexoelectric response for uranium removal and recovery using the organic-inorganic hybrid material

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月2日

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  • Cheng Meng,
  • Di Fu,
  • Chongxiu Li,
  • Zaiqi Cheng,
  • Zhibin Zhang,
  • Xuanting Wei,
  • Bowei Chen,
  • Baowei Hu,
  • Yunhai Liu,
  • Zhenli Sun,
  • Xiangke Wang

摘要

Catalysis was an effective method for uranium recovery and environmental remediation. However, the weak flexoelectric response, despite being universal in dielectric materials, greatly limited its appeal for research and catalytic applications. Here, we proposed a strategy to enhance the flexoelectric response by bridging inorganic chains with metal-organic chains within the structure. The resulting hybrid material, Co[C4H4N2]V2O6, demonstrated excellent uranyl removal performance, surpassing that of state-of-the-art piezocatalysts. Co[C4H4N2]V2O6 showed flexocatalytic uranyl activity across a broad pH range and under high-salinity conditions. Under a dynamic experimental setup, Co[C4H4N2]V2O6 showed strong potential for practical flexocatalytic applications. Co[C4H4N2]V2O6 could efficiently separate uranyl in contaminated potable water, reducing the uranium concentration (~2.0 ppm) to below the drinking water standard (30 ppb). It could also lower the uranium concentration (~5.6 ppm) in mining wastewater to below the discharge limit (300 ppb). Its intrinsic anisotropic mechanical properties and cantilever-like morphology endowed high deformability, which, together with a large dielectric constant, enhanced its flexoelectric polarization. The revealed flexocatalytic mechanism confirmed that uranyl was converted into insoluble (UO2)O2·2H2O by active species generated through dynamic polarization. This work provided a promising avenue for the design of advanced flexocatalysts and offered an effective strategy for uranium recovery and environmental remediation.