Effective Removal of Sr<sup>2+</sup> Ions by K<sub>2</sub>SbPO<sub>6</sub>/Polyacrylonitrile Composite Microspheres
<sup>90</sup>Sr is one of the highly radioactive and hazardous nuclides in nuclear waste liquids. The high water solubility and mobility of <sup>90</sup>Sr<sup>2+</sup> ions make it difficult to effectively remove <sup>90</sup>Sr from the complex aqueo...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-12-01
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| Series: | Separations |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2297-8739/11/12/344 |
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| Summary: | <sup>90</sup>Sr is one of the highly radioactive and hazardous nuclides in nuclear waste liquids. The high water solubility and mobility of <sup>90</sup>Sr<sup>2+</sup> ions make it difficult to effectively remove <sup>90</sup>Sr from the complex aqueous environment. Herein, K<sub>2</sub>SbPO<sub>6</sub>, a phosphatoantimonate ion exchange material with an excellent removal ability for Sr<sup>2+</sup> ions, has been organically granulated with polyacrylonitrile (PAN) by an automated method to form K<sub>2</sub>SbPO<sub>6</sub>/PAN composite microspheres. The K<sub>2</sub>SbPO<sub>6</sub>/PAN microspheres with radiation resistance exhibit a high maximum adsorption capacity (<i>q</i><sub>m</sub><sup>Sr</sup>) of 131.15 mg g<sup>−1</sup> for Sr<sup>2+</sup> ions and retain the high removal rate (<i>R</i><sup>Sr</sup>) in a wide pH range (pH = 3–12). It is important that K<sub>2</sub>SbPO<sub>6</sub>/PAN microspheres could efficiently treat Sr<sup>2+</sup> ions solutions in a dynamic adsorption manner even at 970 bed volumes (<i>R</i><sup>Sr</sup> > 81%). This work paves the way for the preparation of low-cost ion exchange materials with the advantages of regular shape and easy operation by a simple and fast method and the practical application of powdered ion exchange materials. |
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| ISSN: | 2297-8739 |