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Li L.,Beijing Institute of Technology | Wang Z.-F.,Beijing Institute of Technology | Zhang D.-X.,Beijing Institute of Technology | Xiao G.-P.,China Institute of Atomic Energy | And 3 more authors.
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | Year: 2015

p-tert-butylcalix[6]arene (CalixSMO) was synthesized for Sr2+ separation and the chemical structure of the synthesized product was confirmed by FT-IR, 1HNMR and MS. The results show that when the initial concentration of nitric acid is 3 mol×L-1 and CH2Cl2 is used as the organic solvent, the Sr2+ extraction rate could reach to 60% after extraction for 120 min under 298 K. The ratio of CalixSMO/Sr2+ in the inclusion complexes is 1/2. Moreover, studies on the extraction of K+, Sb3+, Ca2+, Sm3+, Sn4+ and Na+ show that CalixSMO has good selectivity for Sr2+. © 2015, Editorial Board of "Journal of Chemical Engineering of Chinese Univesities". All right reserved. Source


Zhang J.-Y.,China Institute of Atomic Energy | Zhou T.,China Institute of Metrology | Li J.-Y.,China Institute of Atomic Energy | Li J.-Y.,China Resources Holdings Co.
Journal of Chinese Mass Spectrometry Society | Year: 2016

High purity silicon is widely used in photovoltaic industry and electronic information industry, in which the impurities are an important factor of affecting its performance. According to the different properties of impurities, the MS and non-MS methods of determination of impurity elements in high purity silicon were classified and summarized, and the merits and demerits of these methods as well as their present application were analyzed in this paper. The detection methods of metallic elements mainly include both MS methods such as GDMS, ICP-MS, SIMS etc., and non-MS methods such as AAS, AES, NAA etc. Whereas for non-metallic element, the determination methods are mainly SIMS method and non-MS methods such as CGHE-IR/TC, IR, etc. For high purity silicon purity analysis, MS methods have apparent advantages for the determination of metal impurity elements, whereas for nonmetal impurity elements, non-MS methods show an advantage. © 2016, Editorial Board of Journal of Chinese Mass Spectrometry Society. All right reserved. Source


Song F.-L.,China Institute of Atomic Energy | Li J.-Y.,China Institute of Atomic Energy | Li J.-Y.,China Resources Holdings Co. | Su Z.,China Institute of Atomic Energy | And 3 more authors.
He-Huaxue yu Fangshe Huaxue/Journal of Nuclear and Radiochemistry | Year: 2011

The irradiated TBP extraction system is separated by distillation, extraction and silica gel chromatography. The Ru retentions by the resulted fractions were determined. The species that retain Ru most are regarded as main complexing agents. The main complexing agents that can coordinate with Ru were identified by infrared spectrophotometer, element analysis, gas chromatography-mass spectrometry and liquid chromatography-mass spectrometry. Nitrous acid ester containing organophosphates are the main complexing agents that can coordinate with Ru. They are responsible for Ru retention. The compounds C12H28O8P2, C81H171 N2O32P7, and C78H161 NO18P4 are deduced to exist in the complexing agents. Source


Song F.-L.,China Institute of Atomic Energy | Li J.-Y.,China Resources Holdings Co. | Su Z.,China Institute of Atomic Energy | Li H.-B.,China Institute of Atomic Energy | And 2 more authors.
He-Huaxue yu Fangshe Huaxue/Journal of Nuclear and Radiochemistry | Year: 2011

The retention of the nitrato complexes of nitrosylruthenium by the irradiated TBP-n-dodecane-HNO3 is studied. The extraction equilibrium time of the nitrato complex of nitrosylruthenium by the irradiated TBP-n-dodecane-HNO3 and the washing equilibrium time by sodium carbonate were determined. The distribution coefficients of ruthenium by several model radiolysis products were determined. The effects of absorbed dose, the nitric acid concentration of the nitrosylruthenium nitrato complex, the nitric acid concentration for preequilibration with TBP before irradiation, ruthenium extracted by the TBP-n-dodecane-HNO3 before irradiation on Ru retention percent were studied by phase ratio variation method. The results show that the extraction equilibrium time is quite long. The wash equilibrium time by sodium carbonate is faster. The Ru retention in irradiated TBP extraction system increases with absorbed dose, the concentration of preequilibrating nitric acid before irradiation, and the cycle number. The Ru retention is larger when Ru is extracted by the TBP-n-dodecane-HNO3 before irradiation. The organic phase is placed for several days after Ru is extracted by the irradiated TBP-n-dodecane-HNO3. The Ru retention increases when the aging time is one day then gradually decreases. The Ru retention is small when there is no diluent or nitric acid in the extraction system before irradiation. The Ru retention changes little with the aging time of the irradiated TBP-n-dodecane-HNO3 and the concentration of extracting nitric acid. Nitric organophosphates are the main complexing agents that can coordinate with Ru. Source


Ruan H.,China Institute of Atomic Energy | Li J.-Y.,China Resources Holdings Co. | Hu S.-L.,China Institute of Atomic Energy | Zhang L.,China Institute of Atomic Energy | Dou Q.-C.,China Institute of Atomic Energy
He-Huaxue yu Fangshe Huaxue/Journal of Nuclear and Radiochemistry | Year: 2011

The CECE process conditions are experimentally studied for H2O-H2 liquid catalytic isotopic exchange with Pt-SDB as hydrophobic catalyst. The results indicate that the performance of packing pretreated with acid is better than that pretreated with alkali. The main impact factors for the catalytic exchange bed resistance drop are operating temperature and the hydrogen flow rate. The height equivalent of theoretical plate (HETP) is also changed to be higher with the increasing of the CECE column diameter and the packing dimension. The efficiency of catalytic exchange reaction is high with a packing ratio of 45:10 of hydrophilic packing and hydrophobic catalyst in separated layers. The HETP decreases with increasing operating temperature, but the trend is slowed down when the temperature is above 70°. The HETP increases with increasing the mole rate of hydrogen flow and the diluted heavy water flow. Source

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