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<p>The Na-P1 type zeolites were synthesized using coal fly ash (FA-Na-P1) and also using chemical reagents (CA-Na-P1) for comparison. Both Na-P1 type zeolites showed a superior adsorption ability for the non-radioactive metal ions of Cs, Sr, Mn, Zn, Co, or Fe, assuming radioisotopes with relatively long half-lives. These zeolites were heat-treated for the immobilization of the adsorbed metal ions in the decomposed zeolite. The elution ratio of the metal ions in the deionized water and seawater for 14 days showed a low elution when the sample was heated at 1000°C and higher temperature for both zeolites. In particular, the elution of the 1100°C heated sample for the zeolite from fly ash significantly decreased compared with that from the chemical reagents. The reaction between the adsorbed cation and zeolite was confirmed to form polymetallic oxide. The formation of the reacted oxide phase suppressed the elution ratio for the FA-Na-P1 zeolite.</p>

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Immobilization and solid reaction of adsorbed metal ions using heat treatment of synthesized Na-P1 type zeolite from coal fly ash

  • 期刊论文

  • 发表日期：

    2025年1月11日

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  • Hiromichi Aono,
  • Ami Takahashi,
  • Takumi Miyamoto,
  • Yoshiteru Itagaki

摘要

The Na-P1 type zeolites were synthesized using coal fly ash (FA-Na-P1) and also using chemical reagents (CA-Na-P1) for comparison. Both Na-P1 type zeolites showed a superior adsorption ability for the non-radioactive metal ions of Cs, Sr, Mn, Zn, Co, or Fe, assuming radioisotopes with relatively long half-lives. These zeolites were heat-treated for the immobilization of the adsorbed metal ions in the decomposed zeolite. The elution ratio of the metal ions in the deionized water and seawater for 14 days showed a low elution when the sample was heated at 1000°C and higher temperature for both zeolites. In particular, the elution of the 1100°C heated sample for the zeolite from fly ash significantly decreased compared with that from the chemical reagents. The reaction between the adsorbed cation and zeolite was confirmed to form polymetallic oxide. The formation of the reacted oxide phase suppressed the elution ratio for the FA-Na-P1 zeolite.