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<p>The effective separation of radioactive strontium-90 (<sup>90</sup>Sr) from high-level liquid waste (HLLW) produced by the PUREX process is essential for enhancing nuclear waste disposal safety and minimizing related expenses. This research work revealed that 4A zeolite showed excellent separation efficiency and selectivity for Sr<sup>2+</sup> in very acidic and alkaline environments that mimic actual HLLW. 4A zeolite displayed superior performance, with an adsorption efficiency of 88.2%, a distribution coefficient (Kd) of 1298.47 mL/g, and a maximum sorption capacity of 18.734&#xa0;mg/g in comparison to numerous standard sorbents reported for the removal of Sr<sup>2+</sup>. It demonstrated prompt adsorption kinetics (~ 2&#xa0;h), extensive pH tolerance (pH 4–9), and outstanding resistance to radiation-induced degradation. In comparison to alternative adsorbents, 4A zeolite presents a distinctive amalgamation of superior efficacy, economical costs, simple synthesis, and environmental compatibility, making it a highly promising option for the remediation of <sup>90</sup>Sr in complex nuclear waste streams.</p>

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Efficient adsorption of Sr2+ from simulated high-level liquid waste by 4A zeolite

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年1月23日

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  • Xiang Qin,
  • Xiliang Guo,
  • Xia Tao,
  • Chao Gao,
  • Xiaojun Yan,
  • Wenfu Yan

摘要

The effective separation of radioactive strontium-90 (90Sr) from high-level liquid waste (HLLW) produced by the PUREX process is essential for enhancing nuclear waste disposal safety and minimizing related expenses. This research work revealed that 4A zeolite showed excellent separation efficiency and selectivity for Sr2+ in very acidic and alkaline environments that mimic actual HLLW. 4A zeolite displayed superior performance, with an adsorption efficiency of 88.2%, a distribution coefficient (Kd) of 1298.47 mL/g, and a maximum sorption capacity of 18.734 mg/g in comparison to numerous standard sorbents reported for the removal of Sr2+. It demonstrated prompt adsorption kinetics (~ 2 h), extensive pH tolerance (pH 4–9), and outstanding resistance to radiation-induced degradation. In comparison to alternative adsorbents, 4A zeolite presents a distinctive amalgamation of superior efficacy, economical costs, simple synthesis, and environmental compatibility, making it a highly promising option for the remediation of 90Sr in complex nuclear waste streams.