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<p>A novel calcium-aluminum-based phosphate (CAP) was synthesized via Al doping for U-Mn co-contaminated groundwater treatment. Under optimal conditions (pH = 5, 180&#xa0;min, 25 ℃), residual U and Mn concentrations were as low as 0.07 and 0.7&#xa0;mg·L<sup>−1</sup>. The adsorption mechanism was determined by combining kinetic/isotherm fitting and characterization results, involving dissolution–precipitation, complexation and ion exchange. CAP shows high adsorption capacity, low cost and good stability, but its powder form suffers from low permeability. Thus, CAP should be immobilized on large-particle carriers for PRB applications, and future work will focus on the loaded composite for dynamic mine wastewater treatment.</p>

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Adsorption properties and mechanism of CAP for U-Mn co-contamination in groundwater

  • 期刊论文

  • 发表日期：

    2026年5月2日

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  • Huijing Peng,
  • Weimin Zhang,
  • Junhui Zhao

摘要

A novel calcium-aluminum-based phosphate (CAP) was synthesized via Al doping for U-Mn co-contaminated groundwater treatment. Under optimal conditions (pH = 5, 180 min, 25 ℃), residual U and Mn concentrations were as low as 0.07 and 0.7 mg·L−1. The adsorption mechanism was determined by combining kinetic/isotherm fitting and characterization results, involving dissolution–precipitation, complexation and ion exchange. CAP shows high adsorption capacity, low cost and good stability, but its powder form suffers from low permeability. Thus, CAP should be immobilized on large-particle carriers for PRB applications, and future work will focus on the loaded composite for dynamic mine wastewater treatment.