期刊
CHEMICAL ENGINEERING JOURNAL
卷 392, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123713
关键词
Hollow flower-like; Titanium ferrocyanide; Radioactive cesium removal; Kirkendall-type diffusion method
资金
- National Research Foundation of Korea (NRF) - Korean government (MSIP) [2017M2A8A5015148, 2016M2B2B1945086]
- National Research Foundation of Korea [2016M2B2B1945086, 2017M2A8A5015148] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The selective removal of Cs-137 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 Cs-137 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 Cs-137 specific activity of approximately 110 Bq/g.
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