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Stable poly(vinyl alcohol) and alginate cross-linked granules with immobilized ferric hexacyanoferrate for cesium removal from waters
Journal of the Taiwan Institute of Chemical Engineers ( IF 5.7 ) Pub Date : 2018-11-23 , DOI: 10.1016/j.jtice.2018.09.028
Cheng-Jui Tsai , Yin-Ru Chang , Man-Li Chen , Yu-Kuo Lo , Duu-Jong Lee

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.



中文翻译:

固定化的聚乙烯醇和藻酸盐交联颗粒与固定化的铁氰化铁氰化物,可从水中去除铯

聚乙烯醇(PVA)颗粒可以固定普鲁士蓝(PB)纳米颗粒以形成有效的铯吸附剂。本文首次通过将PVA,藻酸盐和PB滴与硼酸(PVA-B)交联,然后将形成的颗粒与亲核试剂进行扩展交联,制备了在干燥-再润湿循环中具有形状稳定性的PVA-PB颗粒,6磷酸盐(PVA-P)为12小时,硫酸盐(PVA-S)为12小时,硝酸盐(PVA-N)为12小时。最大q所得PVA颗粒的PB值在76.8-87.6 mg / g PB之间。PVA-B基质对Cs离子的有效扩散率为散装水中的7%。PVA-P的扩散率与PVA-B相似,而PV-S和PVA-N的内部扩散率进一步降低(分别降低46%和67%)。重复洗涤可以最大程度地降低PVA颗粒中六氰合铁酸酯的释放潜力。本发明的干燥,亲核试剂交联的PVA颗粒可以长期保存,当遇到紧急放射性威胁时,可以直接用作自来水厂和管道工场的“急救”放射性Cs屏障。

更新日期:2018-11-24
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