Boosting Interfacial Charge Transfer in Two‐Dimension Superstructure Dual‐Junction for Efficient Uranium Extraction

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Abstract
The exposition of adsorption sites, electron transfer capacity, and durability are key challenges that limit the application of nanoscale zerovalent iron (nZVI)‐based materials for U(VI) recovery from wastewater. Herein, a 2D superstructure dual‐junction (Mo 2 C/BCN/Fe) is constructed by encapsulating Mo 2 C and Fe nanoparticles (NPs) within B, N co‐doped carbon nanosheet through a scalable grind‐assisted pyrolysis method, achieving synergistic structural and electronic modulations. The unidirectional electron transfer pathway (Mo 2 C→BCN→Fe) induced by the integrated dual‐junction, deeply boosts interfacial charge transfer and generates a space charge region at the interface, thereby enhancing the conductivity and achieving the charge‐enhanced multisite binding of U(VI). Simultaneously, the 2D superstructure effectively exposes accessible active sites to promote charge/mass transfer and protects Fe NPs from passivation and aggregation through the spatial confinement effect. Thus, compared to most nZVI‐based materials, the constructed Mo 2 C/BCN/Fe possesses superior saturated U(VI) recovery capacity (701 mg g −1 ) and outstanding recyclability (92.64 %, 5 cycles) in simulated water. Remarkably, Mo 2 C/BCN/Fe can effectively recover U(VI) from real leach tailing wastewater (166 mg g −1 ). Overall, this study offers a universal strategy for designing materials with synergistic structural and electronic effects that can be extended to various transition‐metal‐based 2D nanosheets for environmental remediation and resource recovery.
Funding Information
  • China Postdoctoral Science Foundation (2023M733521)
  • Youth Innovation Promotion Association of the Chinese Academy of Sciences (Y202014)
  • National Natural Science Foundation of China (22138012)
  • National Natural Science Foundation of China (22178349)
  • National Natural Science Foundation of China (22421003)
  • National Natural Science Foundation of China (21921005)
  • National Natural Science Foundation of China (22078333)
  • National Natural Science Foundation of China (22378398)
  • National Natural Science Foundation of China (22108281)
  • National Natural Science Foundation of China (92475204)
  • National Natural Science Foundation of China (22408372)
  • National Natural Science Foundation of China (22408371)
  • National Natural Science Foundation of China (22278407)
  • National Key Research and Development Program of China (2021YFC2901500)

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