Abstract
Cesium (Cs) removal from nuclear liquid wastewater has become an emerging issue for safeguarding public health after the accident at the Fukushima Daiichi Nuclear Power Plant. A novel macrocyclic ligand of o-benzo-p-xylyl-22-crown-6-ether (OBPX22C6) was developed and successfully immobilized onto mesoporous silica for the preparation of hybrid adsorbent. The benzene ring π electron is the part of crown ether of OBPX22C6 for easy orientation of the macrocyclic compound for making the π electron donation with Cs complexation. The potential and feasibility of the hybrid adsorbent as being Cs selective was evaluated in terms of sensitivity, selectivity and reusability. The results clarified that the Cs removal process was rapid and reached saturation within a short time. Considering the effect of competitive ions, sodium (Na) did not markedly affect the Cs adsorption whereas potassium (K) was slightly affected due to the similar ionic radii. However, the oxygen in long ethylene glycol chain in OBPX22C6 was expected to show strong coordination, including Cs-π interaction with Cs even in the presence of the high amount of K and Na. Due to its high selectivity and reusability, significant volume reduction is expected as this promising hybrid adsorbent is used for Cs removal in Fukushima wastewater.
Highlights
A Reliable hybrid adsorbent for efficient radioactive cesium accumulation from contaminated wastewater Awual M
The novel crown ether based hybrid adsorbent was considered as effective adsorbent materials for efficient cesium (Cs) separation in terms of selectivity and reusability
The solution pH exhibited an important parameter of the Cs adsorption on hybrid adsorbent with an optimum pH at 7.0
Summary
Accumulation from Contaminated received: 06 October 2015 accepted: 21 December 2015. Md. Novel cesium selective ligands with crown families have been introduced[31,33,34] These compounds have demonstrated significant complexation ability between the Cs-π interactions of the aromatic rings[35,36,37]. The Cs can interact with the π electron of the benzene ring in OBPX22C6 including the oxygen donation of the long ethylene glycol and Cs can selectively be captured from wastewater even in the presence of the high amount of K and Na ions. The organic-inorganic base hybrid adsorbent possesses high functionality and Cs can be removed even in the presence of extremely similar co-existing alkaline ions. With a view to bring alternative methods, the organic-inorganic based adsorbents are suitable materials for selective Cs separation from the nuclear liquid waste[26,34,42,43,44]. The present work investigated the hybrid adsorbent’s performance in the removal of Cs under different experimental conditions such as contact time, initial solution pH, adsorbent dosage, initial Cs concentration, adsorption equilibrium, competitive cations and reuse in detail
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