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  • Author or Editor: Borong Bao x
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Abstract  

A series of condensed ethylene glycol acrylate monomers with differentmolecular weight was grafted to polyethylene films by means of pre-irradiation.The effect of the molecular weight of monomer and co-solvent system on thegrafting reaction and the properties of the grafted sample were studied. Theexperimental results showed that the initial rate of grafting reaction decreasedand the molar degrees of grafting linearly decreased with the increment ofmolecular weight of the monomer. The grafting degree was increased with theswelling degree of the grafted film. The biocompatibility and blood compatibilityof the grafted PE films were evaluated by the determination of hydrophilicityand anti-thrombus.

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Abstract  

A new68Ge/68Ga generator using CeO2 as absorbent for68Ge has been developed. Sharp elution curves were obtained by using 0.02 mol/l HCl as eluent. About 56% of68Ga formed on the column was concentrated in 0.5 ml of eluate. Neither radioactive impurities, nor dissolved cerium were found in the eluate.

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Abstract  

The extractant HBMPPT (4-benzoyl-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-thione) was synthesized from HBMPP. Its m.p. was 106–108°C. The synergistic extraction of U(VI) and Th(IV) from nitric acid solution by HBMPPT and TOPO in toluene was studied. The extraction ability of HBMPPT was not so high as that of its parent (HBMPP), but when a little tri-n-octylphosphine oxide (TOPO) was added the ability to extract U(VI) and Th(IV) was seriously improved. The synergistic extracted complexes may be presented as UO2NO3·BMPPT·TOPO and UO2(BMPPT)2·TOPO for U(VI), and Th(NO3)3·BMPPT·TOPO and Th(NO3)2(BMPPT)2·TOPO for Th(IV) respectively.

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Abstract  

Some popular neutral extractants (PSO-petroleum sulfoxide, DOSO-di-n-octyl sulfoxide, TBP-tributylphosphate etc.) were chosen as synergist to study the synergistic effect on the extraction reaction with HBMPPT (4-benzoyl-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-thione) for U(VI), and the synergistic separation ability of HBMPPT for U(VI) and Th(IV). The synergistic extraction ability shown by the studied systems for U(VI) is as follows: PSO>DOSO>TBP, and the same sequence was also verified for the separation coefficient of U(VI) and Th(IV). The synergistic complexes may be presented as: UO2NO3·BMPPT·S and UO2(BMPPT)2·S for U(VI) (S is PSO, DOSO or TBP).

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Abstract  

A new anti-thrombosis dialytic membrane with a hydrophilic-hydrophobic microphase structure was prepared by pre-irradiation grafting of -hydroxyethyl methacrylate (HEMA) and styrene (St) onto polyethylene (PE) membranes. The effects of reaction conditions on the degree of grafting were determined, and the properties of the grafted films were investigated. Compared with PE grafted with hydrophilic monomer, the antithrombogenicity and permeability of the PE-g-(HEMA-co-St) were 30 and 15 times higher than that of the ungrafted films, respectively, if the volume ratio (HEMA:St) is about 1:1.

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Abstract  

The extraction of uranium(VI) from sulfuric acid medium with tri-octylphosphine oxide (TOPO) in n-heptane was studied. Accompanied with the increase in the concentration of H2SO4, the distribution coefficient of uranium(VI) increased in the region of dilute sulfuric acid. When the concentration of H2SO4 surpassed 3.5 mol·dm−3, the distribution coefficient of uranium(VI) was at maximum. This result was due to the competition extraction between uranium(VI) and H2SO4. From the data, the composition of extracted species and the equilibrium constant of extraction reaction have been evaluated, which were (TOPOH)2UO2(SO4)2 (TOPO) and 107.6±0.15, respectively.

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Abstract  

The synergistic extraction of uranium(VI) from sulfuric acid solution with primary amine N1923 and tri-octylphosphine oxide (TOPO) inn-heptane was studied. When the mole ratio of primary amine N1923 and TOPO is about 2∶1, the distribution coefficient will be the maximum. This result shows that primary amine N1923 and TOPO could exhibit the distinct synergistic effect for extraction of uranium(VI) from sulfuric acid solution. From the results of the extraction, it was suggested that the composition of synergistic extraction species is (RNH3)UO2(SO4)2·TOPO. The equilibrium constant (K 12) of synergistic extraction reaction has been evaluated, to be 1.07·109. In addition, the integration phenomenon of N1923 and TOPO have been discussed, the integration constant (K 3) is 1.60·102.

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Journal of Radioanalytical and Nuclear Chemistry
Authors: Xue Shuyun, Yang Yonghui, Yang Yanzhao, Sun Sixiu, and Bao Borong

Abstract  

A study on solvent extraction of sulfuric acid by tri-octylphosphine oxide (TOPO) in n-heptane has been made. Extraction coefficients of H2SO4 as a function of H2SO4 concentration in aqueous phase, and extractant concentrations in organic phase have been studied. The composition of extracted species, equilibrium constants of extraction reaction have been evaluated. These results are important for interpreting extraction equilibrium data of uranium(VI) or other metal ions with TOPO in sulfuric acid media.

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Abstract  

In this paper, nine N,N,N,N-tetraalkyldiamides have been synthesized and the extracting ability for uranium and thorium under different conditions has been studied. All results were compared with those obtained by using tributyl phosphate (TBP) under exactly the same conditions. The extracting ability of thorium and uranium for different N,N,N,N-tetraalkyldiamides is discussed.

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Abstract  

In order to obtain a more ideal hydrogel wound dressing, crosslinked hydrogel films blended with polyvinyl alcohol (PVA), polyvinyl pyrrolidone, kappa-carrageenan (KC), and powder silk were prepared by electron beam, and their physiochemical properties were investigated as a combination of function factors. The experimental results showed that the gel fraction of the hydrogel films depended mainly on irradiation dose and the monomer concentration of the polymers, the properties of hydrogel could be greatly extended or improved by blending homopolymers. The rate of gel formation of the hydrogel was raised, and the water evaporation from hydrogel could be retarded after mixing with KC, while the tensile strength of hydrogel films were obviously increased after mixing with silk. Toxicity and healing effect of PVA/PVP/KC/silk blended hydrogel films as wound dressings were evaluated. The irradiated blended hydrogel showed satisfactory properties for wound dressing, the hydrogel did not induceany acute general toxic effects, and it is effective for fast healing of wound.

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