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<p>Carbonated waste concrete powder (CWCP), a CO<sub>2</sub>-mineralized derivative of construction waste, was developed for Th(IV) removal from aqueous solutions, integrating waste-concrete recycling, CO<sub>2</sub> mineralization, and radionuclide immobilization. CWCP achieved more than 99.8% Th(IV) removal over pH 2.0–9.0 and reduced Th(IV) in wastewater to 0.009&#xa0;mg L<sup>−1</sup> at a dosage of 4.0&#xa0;g L<sup>−1</sup>. The Langmuir apparent maximum capacity was 1917.71&#xa0;mg&#xa0;g<sup>−1</sup>. Characterization indicated a precipitation–anchoring–hydrogen-bonding pathway involving amorphous Th(OH)<sub>4</sub>.</p>

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Ultra-fast and efficient removal of thorium from aqueous solutions by carbonated waste concrete powder

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Xiaowei Ouyang,
  • Shikai Chen,
  • Weiyu Li,
  • Jiongqi Chen,
  • Gaosheng Zhang,
  • Yuwei Ma,
  • Xiaowu Huang,
  • Jiyang Fu

摘要

Carbonated waste concrete powder (CWCP), a CO2-mineralized derivative of construction waste, was developed for Th(IV) removal from aqueous solutions, integrating waste-concrete recycling, CO2 mineralization, and radionuclide immobilization. CWCP achieved more than 99.8% Th(IV) removal over pH 2.0–9.0 and reduced Th(IV) in wastewater to 0.009 mg L−1 at a dosage of 4.0 g L−1. The Langmuir apparent maximum capacity was 1917.71 mg g−1. Characterization indicated a precipitation–anchoring–hydrogen-bonding pathway involving amorphous Th(OH)4.