Journal
WATER RESEARCH
Volume 95, Issue -, Pages 134-141Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2016.02.052
Keywords
Nanoadsorbent; Radioactive cesium; Chabazite; Adsorption; Flocculation
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [NRF-2012M2A8A5025658]
- National Research Foundation of Korea [2012M2A8A5025658] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Finding a striking peculiarity of nanomaterials and evaluating its feasibility for practical use are interesting topics of research. We investigated the application of nanozeolite's outstanding reactivity for a rapid and effective method for radioactive cesium removal in the wastewater generated from nuclear power plant accident, as a new concept. Extremely fast removal of cesium, even without stirring, was achieved by the nanozeolite at efficiencies never observed with bulk materials. The nanozeolite reached an adsorption equilibrium state within 1 min. Cesium adsorption by nanozeolite was demonstrated at reaction rates of orders of magnitude higher than that of larger zeolite phases. This observation was strongly supported by the positive correlation between the rate constant ratio (k(2,bulk)/k(2,nano)) and the initial Cs concentrations with a correlation coefficient (R-2) of 0.99. A potential drawback of a nano adsorbent is the difficulty of particle settling and separation because of its high dispersivity in solution. However, our results also demonstrated that the nanozeolite could be easily precipitated from the high salt solution with ferric flocculant. The flocculation index reached a steady state within 10 min. A series of our experimental results met the goal of rapid processing in the case of emergency by applying the well-suited nanozeolite adsorption and flocculation. (C) 2016 Elsevier Ltd. All rights reserved.
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