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<p>As a non-renewable resource, the supply of phosphorus is very limited. On the contrary, there is a significant amount of phosphorus waste causing serious environmental problems. The clear contrast has raised deep concerns about future phosphorus supply shortages and widespread environmental issues. In this study, CoNi-LDH/CNTs hybrid films were prepared by drop-coating and electrodeposition, and then used for the recovery of phosphorus ions from wastewater via an electrically switched ion exchange (ESIX) method. During the experimental process, it was found that CNTs can not only improve the conductivity of the film, but also serve as a support material for LDH to avoid agglomeration. In addition, the electrochemical adsorption capacities of CoNi-LDH/CNTs for phosphate were measured under different conditions. The results show that CoNi-LDH/CNTs recover the PO<sub>4</sub><sup>3−</sup> by a potential-induced electrostatic attraction and ligand exchange mechanism. Furthermore, CoNi-LDH/CNTs exhibited an outstanding electrochemical adsorption capacity for PO<sub>4</sub><sup>3−</sup> and high exclusivity toward other coexisting anions. Moreover, CoNi-LDH/CNTs could be used over a wide pH range (pH = 4–10). Therefore, CoNi-LDH/CNTs can be used in the ESIX process to achieve effective phosphorus removal and recovery from wastewater.</p>

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Potential-evoked exclusive and stable recovery of phosphate ion by CoNi-LDH/CNTs hybrid film

  • 期刊论文

  • 发表日期：

    2025年9月30日

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  • Jianan Pei,
  • Jiaxin Guo,
  • Zhongliang Yu,
  • Song Yang,
  • Yanyan Yang,
  • Xiaogang Hao

摘要

As a non-renewable resource, the supply of phosphorus is very limited. On the contrary, there is a significant amount of phosphorus waste causing serious environmental problems. The clear contrast has raised deep concerns about future phosphorus supply shortages and widespread environmental issues. In this study, CoNi-LDH/CNTs hybrid films were prepared by drop-coating and electrodeposition, and then used for the recovery of phosphorus ions from wastewater via an electrically switched ion exchange (ESIX) method. During the experimental process, it was found that CNTs can not only improve the conductivity of the film, but also serve as a support material for LDH to avoid agglomeration. In addition, the electrochemical adsorption capacities of CoNi-LDH/CNTs for phosphate were measured under different conditions. The results show that CoNi-LDH/CNTs recover the PO43− by a potential-induced electrostatic attraction and ligand exchange mechanism. Furthermore, CoNi-LDH/CNTs exhibited an outstanding electrochemical adsorption capacity for PO43− and high exclusivity toward other coexisting anions. Moreover, CoNi-LDH/CNTs could be used over a wide pH range (pH = 4–10). Therefore, CoNi-LDH/CNTs can be used in the ESIX process to achieve effective phosphorus removal and recovery from wastewater.