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RISS 인기검색어
- 검색키워드
- 저자 : Matsuyama Shigeo (검색결과 2 건)
- 무료
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Recovery of cesium ions from seawater using a porous silica-based ionic liquid impregnated adsorbent
Hao Wu,Tatsuya Kudo,Seong-Yun Kim,Misako Miwa,Shigeo Matsuyama 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.5
A porous silica-based adsorbent was prepared by impregnating the pores of a silica support with theextractant 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-calix[4]arene (Calix[4]arene-R14) and anadditive agent 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C2mim þ NTf2) as thematerials to remove cesium(I) (Csþ) ions from seawater. The as-prepared adsorbent showed excellentadsorption performance toward Csþ ions, with adsorption equilibrium reached within 2 h and anadsorption amount of 0.196 mmol/g observed. The solution pH, temperature, and the presence ofcoexisting metal ions were found to have almost no effect on Csþ adsorption. The adsorption mechanismwas considered to proceed via ion exchange between Csþ and C2mimþ. In addition, the particle-inducedX-ray emission analysis results further clarified that the adsorbed Csþ ion species on the adsorbent wasin the form of both CsCl and CsBr
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Wu Hao,Kim Seong-Yun,Ito Tatsuya,Miwa Misako,Matsuyama Shigeo 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.10
A simple solvothermal reaction was used to prepare a 3-aminopropyl-functionalized silica-gel-based adsorbent for adsorbing Pd(II) from the nitric acid solution. Scanning electron microscopy, fourier transform infrared spectroscopy, and thermogravimetry analysis were performed on the as-synthesized adsorbent to demonstrate the successful introduction of Schiff base groups. Batch experiments were used to investigate the effects of contact time, nitric acid concentration, solution temperature, and adsorption capacity. It is worth noting that the prepared adsorbent exhibited a higher affinity toward Pd(II) with the uptake approximately 100% even in a 2 M HNO3 solution. At an equilibrium time of 5 h, the maximum adsorption capacity of Pd(II) was estimated to be 0.452 mmol/g. The adsorbed Pd(II) could be completely eluted by dissolving 0.2 M thiourea solution in 0.1 M HNO3. Using a combination of particle-induced Xray emission analysis and an X-ray photoelectron spectrometer, the adsorbed Pd was found to be uniformly distributed on the surface of the prepared adsorbent and the existing species were Pd(II) and zero-valent Pd(0). Due to the desirable performances, facile preparation method, and abundant raw material source, the prepared adsorbent demonstrated a high application potential in the recovery of Pd(II) from simulated high-level liquid waste treatment
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