吸附
化学
铯
亚铁氰化钾
钛
亚铁氰化物
扩散
钙长石
核化学
选择性
无机化学
海水
动力学
沸石
有机化学
催化作用
物理化学
地质学
物理
海洋学
热力学
量子力学
电极
作者
Hee‐Man Yang,Chan Woo Park,Ilgook Kim,In-Ho Yoon
标识
DOI:10.1016/j.cej.2019.123713
摘要
The selective removal of 137Cs from contaminated seawater or radioactive liquid waste remains a challenge due to the presence of high concentrations of competing ions, such as K+, Na+, Mg2+, and Ca2+. Here, we report a simple synthetic strategy to prepare hollow flower-like titanium ferrocyanide (hf-TiFC) for the removal of 137Cs from water with enhanced Cs adsorption properties compared with conventional Cs adsorbents such as zeolites and crystalline silicotitanate (CST). hf-TiFC composed of 2-dimensional TiFC flakes was fabricated using a TiO2 sacrificial template via a simple reaction with potassium ferrocyanide (FC) based on the Kirkendall-type diffusion method under acidic conditions. The resulting hf-TiFC shows much faster Cs adsorption kinetics than the granular form of TiFC (g-TiFC) due to the lack of resistance against intracrystalline diffusion of Cs and a maximum adsorption capacity (454.54 mg/g) 3-fold higher than that of g-TiFC because of the increased effective surface area of hf-TiFC. Moreover, hf-TiFC also has better Cs adsorption kinetics, capacity and selectivity of Cs than do well-known Cs adsorbents such as chabazite (CHA) and protonated CST (HCST). In radioactive tests, even the low concentration of hf-TiFC (0.1 g/L) exhibited excellent removal performances in simulated seawater and nuclear liquid waste at pH 1 and 5.7 M Na+ with a high removal efficiency exceeding 99.1% at an initial 137Cs specific activity of approximately 110 Bq/g.
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