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<p>Removing <sup>60</sup>Co from the primary-circuit wastewater of nuclear power plant is essential for environmental protection and the health of workers. An efficient Co<sup>2+</sup> adsorbent was prepared by modifying amine resin D380 with carbon disulfide (CS₂) under alkaline conditions to yield xanthate-functionalized amino resin (XD380). Key experimental variables governing Co<sup>2+</sup> uptake in aqueous media were systematically examined. The maximum adsorption capacity reached 68.07&#xa0;mg&#xa0;g<sup>−1</sup> at pH 7, with a XD380 dosage of 2.5&#xa0;mg&#xa0;mL<sup>−1</sup>.The Freundlich isothermal adsorption model and pseudo-second-order adsorption kinetics effectively describe the adsorption behavior. XD380 exhibits notable radiation resistance, reusability, and adsorption selectivity. In dynamic adsorption experiments, the dynamic equilibrium adsorption capacity reached 13.17&#xa0;mg&#xa0;g<sup>−1</sup> under optimal conditions. Spectroscopic analyses before and after adsorption indicate that sulfur and nitrogen atomic groups serve as the primary binding sites, with Co<sup>2+</sup> being adsorbed and fixed through chelation and complexation. These findings provide a solid experimental foundation for the potential application of XD380 in treating radioactive cobalt-bearing wastewater.</p>

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Adsorption of cobalt on xanthate functionalized amine resin in aqueous solutions: batch and fixed-bed studies

  • 期刊论文

  • 发表日期：

    2025年8月2日

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  • Yusen Liu,
  • Yizhi Chen,
  • Qiqi Guo,
  • Peng Zhang,
  • Yifan Li,
  • Zhiyi Wang,
  • Hanbao Chong,
  • Mingzhang Lin

摘要

Removing 60Co from the primary-circuit wastewater of nuclear power plant is essential for environmental protection and the health of workers. An efficient Co2+ adsorbent was prepared by modifying amine resin D380 with carbon disulfide (CS₂) under alkaline conditions to yield xanthate-functionalized amino resin (XD380). Key experimental variables governing Co2+ uptake in aqueous media were systematically examined. The maximum adsorption capacity reached 68.07 mg g−1 at pH 7, with a XD380 dosage of 2.5 mg mL−1.The Freundlich isothermal adsorption model and pseudo-second-order adsorption kinetics effectively describe the adsorption behavior. XD380 exhibits notable radiation resistance, reusability, and adsorption selectivity. In dynamic adsorption experiments, the dynamic equilibrium adsorption capacity reached 13.17 mg g−1 under optimal conditions. Spectroscopic analyses before and after adsorption indicate that sulfur and nitrogen atomic groups serve as the primary binding sites, with Co2+ being adsorbed and fixed through chelation and complexation. These findings provide a solid experimental foundation for the potential application of XD380 in treating radioactive cobalt-bearing wastewater.