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SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2025, Vol. 77 ›› Issue (1): 30-41.DOI: 10.1016/j.cjche.2024.09.014

• • 上一篇    下一篇

Selective and effective removal of cesium ions using Prussian blue analog@γ-alumina core-shell pellets

Jiajia Song1, Ying Liu1, Baojian Liu1,2, Yifeng Cao1,2, Jinxiong Lin1,2, Fuxing Shen1,2, Qiwei Yang1,2, Zhiguo Zhang1,2, Qilong Ren1,2, Zongbi Bao1,2   

  1. 1. Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China;
    2. Institute of Zhejiang University-Quzhou, Quzhou 324000, China
  • 收稿日期:2024-07-25 修回日期:2024-09-01 接受日期:2024-09-23 出版日期:2025-01-28 发布日期:2024-10-18
  • 通讯作者: Baojian Liu,E-mail:liubj@zju.edu.cn;Zongbi Bao,E-mail:baozb@zju.edu.cn
  • 基金资助:
    This work was supported by the Key Reasearch and Development Program of Zhejiang (2022C01029), the National Natural Science Foundation of China (22225802 and 22288102) and the Research Funds of Institute of Zhejiang University-Quzhou (IZQ2022KJ3005).

Selective and effective removal of cesium ions using Prussian blue analog@γ-alumina core-shell pellets

Jiajia Song1, Ying Liu1, Baojian Liu1,2, Yifeng Cao1,2, Jinxiong Lin1,2, Fuxing Shen1,2, Qiwei Yang1,2, Zhiguo Zhang1,2, Qilong Ren1,2, Zongbi Bao1,2   

  1. 1. Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China;
    2. Institute of Zhejiang University-Quzhou, Quzhou 324000, China
  • Received:2024-07-25 Revised:2024-09-01 Accepted:2024-09-23 Online:2025-01-28 Published:2024-10-18
  • Contact: Baojian Liu,E-mail:liubj@zju.edu.cn;Zongbi Bao,E-mail:baozb@zju.edu.cn
  • Supported by:
    This work was supported by the Key Reasearch and Development Program of Zhejiang (2022C01029), the National Natural Science Foundation of China (22225802 and 22288102) and the Research Funds of Institute of Zhejiang University-Quzhou (IZQ2022KJ3005).

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摘要： The removal of cesium-137 (137Cs) from nuclear wastewater remains crucial due to its radioactivity and high solubility in water, which pose serious risk to human health and the environment. Aiming at selective capture of Cs+ from wastewater, a core-shell adsorbent, Prussian blue analog@γ-alumina (PBA@Al2O3) pellets were synthesized using the hydrothermal-stepwise deposition method. The core-shell PBA@Al2O3 pellets showcased a PBA loading of 25% and demonstrated a maximum adsorption capacity of 15.65 mg·g-1. The adsorption data was consistent with the pseudo-second-order kinetic model and the Langmuir isotherm model. It effectively reduced bulk Cs+ concentrations from an initial 6.62 mg·L-1 to 2 μg·L-1, achieving a removal efficiency of 99.97% and distribution coefficient (Kd) of 1.265×106 ml·g-1, surpassing the performance of other PBA-based materials. The material also indicated good mechanical properties and cesium ion removal rates of 99.7% across a wide pH range (1.82 to 11.12). Furthermore, PBA@Al2O3 exhibited consistent removal rate of over 99% and good selectivity (SF=50—1600) towards Cs+ even in the presence of interfering ions such as Na+, K+, Mg2+, and Ca2+ ions. The Kd(Cs+) for PBA@Al2O3 in simulated seawater and groundwater were 9.92×103 and 2.23×104 ml·g-1, where the removal rates reached 96.1% and 98.2%, respectively. XPS confirms that the adsorption mechanism is the ion exchange between Cs+ and K+ ions. This study underscores the significant potential of inorganic core-shell pellets adsorbents as promising agents for the selective capture of Cs+ from wastewater.

关键词: Adsorption, Cesium removal, Prussian blue analog, Nuclear wastewater, Core-shell

Abstract: The removal of cesium-137 (137Cs) from nuclear wastewater remains crucial due to its radioactivity and high solubility in water, which pose serious risk to human health and the environment. Aiming at selective capture of Cs+ from wastewater, a core-shell adsorbent, Prussian blue analog@γ-alumina (PBA@Al2O3) pellets were synthesized using the hydrothermal-stepwise deposition method. The core-shell PBA@Al2O3 pellets showcased a PBA loading of 25% and demonstrated a maximum adsorption capacity of 15.65 mg·g-1. The adsorption data was consistent with the pseudo-second-order kinetic model and the Langmuir isotherm model. It effectively reduced bulk Cs+ concentrations from an initial 6.62 mg·L-1 to 2 μg·L-1, achieving a removal efficiency of 99.97% and distribution coefficient (Kd) of 1.265×106 ml·g-1, surpassing the performance of other PBA-based materials. The material also indicated good mechanical properties and cesium ion removal rates of 99.7% across a wide pH range (1.82 to 11.12). Furthermore, PBA@Al2O3 exhibited consistent removal rate of over 99% and good selectivity (SF=50—1600) towards Cs+ even in the presence of interfering ions such as Na+, K+, Mg2+, and Ca2+ ions. The Kd(Cs+) for PBA@Al2O3 in simulated seawater and groundwater were 9.92×103 and 2.23×104 ml·g-1, where the removal rates reached 96.1% and 98.2%, respectively. XPS confirms that the adsorption mechanism is the ion exchange between Cs+ and K+ ions. This study underscores the significant potential of inorganic core-shell pellets adsorbents as promising agents for the selective capture of Cs+ from wastewater.

Key words: Adsorption, Cesium removal, Prussian blue analog, Nuclear wastewater, Core-shell

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