Stable poly(vinyl alcohol) and alginate cross-linked granules with immobilized ferric hexacyanoferrate for cesium removal from waters
| Autor: | Cheng-Jui Tsai, Yu-Kuo Lo, Duu-Jong Lee, Yin-Ru Chang, Man-Li Chen |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Vinyl alcohol
Prussian blue General Chemical Engineering Nanoparticle 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Phosphate 01 natural sciences 0104 chemical sciences Boric acid Matrix (chemical analysis) chemistry.chemical_compound Adsorption chemistry Sulfate 0210 nano-technology Nuclear chemistry |
| Zdroj: | Journal of the Taiwan Institute of Chemical Engineers. 95:1-10 |
| ISSN: | 1876-1070 |
| DOI: | 10.1016/j.jtice.2018.09.028 |
| Popis: | The poly(vinyl alcohol) (PVA) granules can immobilize Prussian blue (PB) nanoparticles to form efficient cesium adsorbent. This paper for the first time produced the PVA-PB granules with shape stability at drying-re-wetting cycles by crosslinking PVA, alginate and PB drops with boric acid (PVA-B) followed by extended crosslinking of the formed granules with nucleophiles, 6 hr for phosphate (PVA-P), 12 hr for sulfate (PVA-S), and > 12 hr for nitrate (PVA-N). The qmax values for the yielded PVA granules ranged 76.8–87.6 mg/g PB. The PVA-B matrix has effective diffusivity for Cs ions at 7% of that in the bulk water. The PVA-P has similar diffusivity with PVA-B, while the PV-S and PVA-N have further reduced internal diffusivities (by 46% and 67%, respectively). Repeated washing can minimize the hexacyanoferrate release potential from the PVA granules. The present dried, nucleophile-crosslinked PVA granules can be stored for long time period and can be used directly as the “first-aid” radioactive Cs barrier for waterworks and pipeline stations when meeting urgent radioactive threats. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect