Stable poly(vinyl alcohol) and alginate cross-linked granules with immobilized ferric hexacyanoferrate for cesium removal from waters
Journal
Journal of the Taiwan Institute of Chemical Engineers
Journal Volume
95
Pages
1-10
Date Issued
2019
Author(s)
Abstract
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.
SDGs
Type
journal article