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<p>Radioactive waste liquids and their derivatives have gradually become a potential threat to mankind. In this study, the FA-Fe-illite was prepared by using fulvic acid to modify the material for the adsorption of Eu(III) after with illite as the matrix and via ferric nitrate as the iron-based donor source. The results showed that the adsorption efficiency of FA-Fe-illite for Eu(III) was significantly better than that of raw illite and iron-column supported illite(Fe-illite). When the pH was 6 , the temperature was 298 K, the time was 60 minutes, and the dosage was 1.2 g/L, the removal rate of europium the removal rate of FA-Fe-illite reached 88.13%. The adsorption process followed the quasi-secondary kinetic model and Langmuir isotherm. Moreover, the thermodynamic parameters also indicated that the adsorption of Eu(III) was an entropy-increasing process with spontaneous heat absorption. Ion exchange, electrostatic adsorption, and surface functional group trapping (-COOH, -OH) played important roles in the adsorption of Eu(III) by FA-Fe-illite. Even after five adsorption-desorption cycles, the removal rate still maintained at 75%. These findings provide insights for the removal of Eu(III) in radioactive pollution control.</p>

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Removal Performance and Mechanism of Eu (III) on Illite Supported by Hydroxyl Iron Pillars Modified with Fulvic Acid

  • 期刊论文

  • 发表日期：

    2025年1月20日

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  • Dandan Liu,
  • Jianqiao Liu,
  • Xiaoli Chen,
  • YiJu Zhu,
  • Yi Zhou,
  • Jun Liu,
  • Fangzhu Xiao,
  • Guowen Peng

摘要

Radioactive waste liquids and their derivatives have gradually become a potential threat to mankind. In this study, the FA-Fe-illite was prepared by using fulvic acid to modify the material for the adsorption of Eu(III) after with illite as the matrix and via ferric nitrate as the iron-based donor source. The results showed that the adsorption efficiency of FA-Fe-illite for Eu(III) was significantly better than that of raw illite and iron-column supported illite(Fe-illite). When the pH was 6 , the temperature was 298 K, the time was 60 minutes, and the dosage was 1.2 g/L, the removal rate of europium the removal rate of FA-Fe-illite reached 88.13%. The adsorption process followed the quasi-secondary kinetic model and Langmuir isotherm. Moreover, the thermodynamic parameters also indicated that the adsorption of Eu(III) was an entropy-increasing process with spontaneous heat absorption. Ion exchange, electrostatic adsorption, and surface functional group trapping (-COOH, -OH) played important roles in the adsorption of Eu(III) by FA-Fe-illite. Even after five adsorption-desorption cycles, the removal rate still maintained at 75%. These findings provide insights for the removal of Eu(III) in radioactive pollution control.