Nuclear Emergency and Environmental Protection Division, Korea Atomic Energy Research Institute (KAERI), Daejeon 34057, Republic of Korea.
Smart Textile Convergence Research Group, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Republic of Korea.
J Hazard Mater. 2018 Sep 5;357:449-456. doi: 10.1016/j.jhazmat.2018.06.037. Epub 2018 Jun 19.
After the Fukushima nuclear accident, tremendous efforts were made to treat radiocesium, radiostrontium, and other radioactive materials. For the first time, we demonstrate that a TiO photocatalyst can significantly enhance Cs adsorption by Prussian blue-deposited TiO (PB/TiO) under UV irradiation. In this study, we synthesized PB/TiO using the photodeposition method. After the Cs ions were adsorbed on the PB/TiO in darkness, we then exposed the PB/TiO to UV light irradiation. This resulted in a further increase in Cs ion adsorption of more than 10 times the amount adsorbed in darkness. This photocatalytic-enhanced adsorption of Cs ions was not observed on PB mixed with SiO, nor under visible light irradiation. We investigated the effects of PB concentration, PB/TiO concentration, and gas purging on both dark and photocatalytic-enhanced adsorption of Cs ions by PB/TiO. Based on the results, we suggest that the photocatalytic-enhanced adsorption of Cs ions on PB/TiO is due to photocatalytic reduction of PB, which leads to additional adsorption of Cs ions. The change in solution color before and after the reaction, and the change in solution pH in the dark and during UV irradiation strongly support this suggestion. The photocatalytic-enhanced adsorption of Cs ions was equivalent during radioactive Cs removal, indicating important applications for pollutant removal from contaminated water.
福岛核事故后，人们做出了巨大努力来处理放射性铯、放射性锶等放射性物质。我们首次证明，在紫外光照射下，TiO 光催化剂可以显著增强普鲁士蓝沉积 TiO（PB/TiO）对 Cs 的吸附。本研究采用光沉积法合成了 PB/TiO。在黑暗中 PB/TiO 吸附 Cs 离子后，将其暴露于紫外光下。这导致 Cs 离子的吸附量进一步增加了 10 倍以上，超过了在黑暗中吸附的量。在 PB 与 SiO 混合的情况下，或者在可见光照射下，都没有观察到 PB/TiO 的光催化增强吸附 Cs 离子的现象。我们研究了 PB 浓度、PB/TiO 浓度和气体吹扫对 PB/TiO 吸附 Cs 离子的黑暗吸附和光催化增强吸附的影响。基于这些结果，我们提出，PB/TiO 上 Cs 离子的光催化增强吸附是由于 PB 的光催化还原，导致额外吸附 Cs 离子。反应前后溶液颜色的变化以及黑暗中和紫外光照射下溶液 pH 的变化强烈支持这一假设。在放射性 Cs 去除过程中，Cs 离子的光催化增强吸附效果相当，表明其在去除受污染水中的污染物方面具有重要的应用价值。
