title: Selective cesium removal from radioactive liquid waste by crown ether immobilized new class conjugate adsorbent.
abstract: Conjugate materials can provide chemical functionality, enabling an assembly of the ligand complexation ability to metal ions that are important for applications, such as separation and removal devices. In this study, we developed ligand immobilized conjugate adsorbent for selective cesium (Cs) removal from wastewater. The adsorbent was synthesized by direct immobilization of dibenzo-24-crown-8 ether onto inorganic mesoporous silica. The effective parameters such as solution pH, contact time, initial Cs concentration and ionic strength of Na and K ion concentrations were evaluated and optimized systematically. This adsorbent was exhibited the high surface area-to-volume ratios and uniformly shaped pores in case cavities, and its active sites kept open functionality to taking up Cs. The obtained results revealed that adsorbent had higher selectivity toward Cs even in the presence of a high concentration of Na and K and this is probably due to the Cs-π interaction of the benzene ring. The proposed adsorbent was successfully applied for radioactive Cs removal to be used as the potential candidate in Fukushima nuclear wastewater treatment. The adsorbed Cs was eluted with suitable eluent and simultaneously regenerated into the initial form for the next removal operation after rinsing with water. The adsorbent retained functionality despite several cycles during sorption-elution-regeneration operations.
authors: Actinide Coordination Chemistry Group, Quantum Beam Science Centre (QuBS), Japan Atomic Energy Agency (SPring-8), Hyogo 679-5148, Japan. Electronic address: awual.rabiul@jaea.go.jp.
authors: Md Rabiul
authors: MR
authors: Awual
authors: Actinide Coordination Chemistry Group, Quantum Beam Science Centre (QuBS), Japan Atomic Energy Agency (SPring-8), Hyogo 679-5148, Japan.
authors: Tsuyoshi
authors: T
authors: Yaita
authors: Nano-Structure Synthesis Research Group, Quantum Beam Science Centre (QuBS), Japan Atomic Energy Agency, Tokai-mura, Ibaraki-ken 319-1195, Japan.
authors: Tomitsugu
authors: T
authors: Taguchi
authors: Actinide Coordination Chemistry Group, Quantum Beam Science Centre (QuBS), Japan Atomic Energy Agency (SPring-8), Hyogo 679-5148, Japan.
authors: Hideaki
authors: H
authors: Shiwaku
authors: Actinide Coordination Chemistry Group, Quantum Beam Science Centre (QuBS), Japan Atomic Energy Agency (SPring-8), Hyogo 679-5148, Japan.
authors: Shinichi
authors: S
authors: Suzuki
authors: Actinide Coordination Chemistry Group, Quantum Beam Science Centre (QuBS), Japan Atomic Energy Agency (SPring-8), Hyogo 679-5148, Japan.
authors: Yoshihiro
authors: Y
authors: Okamoto
mesh_terms: D000327:Adsorption; D002588:Cesium Radioisotopes / Q000737:chemistry*; D043844:Crown Ethers / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D011848:Radioactive Pollutants / Q000737:chemistry*; D011850:Radioactive Waste; D012822:Silicon Dioxide / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D002588:Cesium Radioisotopes; D043844:Crown Ethers; D011848:Radioactive Pollutants; D011850:Radioactive Waste; C071087:dibenzo-24-crown-8; D012822:Silicon Dioxide
keywords: Conjugate adsorbent; Nuclear liquid waste; Radioactive cesium; Reuses; Selectivity