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1.
The effect of the replacement of MnO2 by Fe2O3 on the oxidation states of iron in some lithium borosilicate glasses were studied using Mössbauer spectroscopy. DTA and infrared measurements showed the presence of two glassy phases, one of them containing iron and the other manganese. The Mössbauer spectra were measured at room temperature for all the glass samples. The spectra revealed the presence of Fe ions only in ferric state in both tetrahedral and octahedral coordination. Also, it was observed that the ratio between the number of iron ions in both coordination states has not changed with the increase of MnO2 content. 相似文献
2.
The equilibrium and rate of solvent extraction of zinc chloride complexes from HCl solutions into benzene solutions of tributyl phosphate (TBP) have been studied. The extracted species are discussed in the light of the results. The extraction was found to be first order with respect to both Zn(II) and TBP, and zero order for HCl. The rate-controlling steps are discussed and the rate constants for these reactions are calculated. 相似文献
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The extractability of antimony(III) and (V) with tridodecylamine from various aqueous solutions is reported. Extraction from nitric and hydrofluoric acid solutions is low, but extraction from sulphuric, hydrochloric and hydrobromic solutions is high. Antimony-(III) can be separated from antimony(V) in 7M nitric acid or 0.64M hydrobromic acid. The extraction of antimony from hydrochloric acid solutions in methanol, ethanol, and acetone-water mixtures is greater than from pure aqueous solutions of the same acidity. The elements from which antimony can be separated with tertiary amines are given. 相似文献
4.
A systematic study on the extraction of99Mo and its daughter99mTc by pure organic diluents and dinonylnaphthalinesulfonic acid (DNNS) is described. The aqueous phases used are H2SO4, HCl, KI and their binary mixture solutions. The effect of alcohols on the distribution coefficient has been investigated.
As a result of the study, a simple and rapid generator is built for the production of pure99mTc from99Mo. 相似文献
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Hamoud Moustafa A. Allan Karam F. Sanad Wafaa A. Saad Ebtissam A. Mahmoud Mamdoh R. 《Journal of Radioanalytical and Nuclear Chemistry》2020,324(2):647-661
Polyacrylonitrile/ferrocyanide composite incorporated with cetrimonium bromide (PFICB) was synthesized and evaluated as a novel bifunctional adsorbent for coremoval of Cs+ and HCrO4?. Results of the reaction time effect showed that adsorption of Cs+ and HCrO4? onto PFICB were rapid processes. The effect of the solution pH in the range 2.5–10 revealed that PFICB had the ability to simultaneously remove Cs+ and HCrO4?. The maximum adsorption capacity of PFICB was found to be 41.79 mg/g for Cs+ and 19.39 mg/g for HCrO4?. These values were compared with those reported in literature using other adsorbents.
相似文献7.
Alian A. El-Kot A. Haggag A. Sanad W. Tadros N. 《Journal of Radioanalytical and Nuclear Chemistry》1975,26(1):39-49
Journal of Radioanalytical and Nuclear Chemistry - A systematic study has been carried out on the extraction of thallium halides with aromatic hydrocarbons, TBP and Amberlite LA2. Extraction has... 相似文献
8.
Sherif M. H. Sanad Azza M. Abdel‐Fattah Fawzy A. Attaby Mohamed A. A. Elneairy 《Journal of heterocyclic chemistry》2019,56(2):651-662
Pyridine‐2(1H)‐thiones were prepared and reacted with several active halogenated reagents to afford novel thieno[2,3‐b]pyridines in excellent yields. Thieno[2,3‐b]pyridine‐2‐carbohydrazide derivative was prepared by the reaction of either ethyl 2‐((3‐cyanopyridin‐2‐yl)thio)acetate derivative or thieno[2,3‐b]pyridine‐2‐carboxylate derivative with hydrazine hydrate. On the other hand, the reaction of either pyridine‐2(1H)‐thione or ethyl 2‐((pyridin‐2‐yl)thio)acetate derivative with hydrazine hydrate afforded the corresponding 1H‐pyrazolo[3,4‐b]pyridine derivative. Thieno[2,3‐b]pyridine derivatives reacted with several reagents to afford the corresponding pyrimidine‐4(3H)‐ones and [1,2,3]triazin‐4‐(3H)‐one. Moreover, 2‐carbohydrazide derivative reacted with β‐dicarbonyl reagents to give 2‐((3‐methyl‐1H‐pyrazol‐1‐yl)carbonyl)thienopyridines. The structure of the target molecules is elucidated using elemental analyses and spectral data. 相似文献
9.
Novel bis(hydrazinecarbothioamide) was prepared by the reaction of 1,4‐bis[(3‐formyl‐4‐hydroxyphenyl)methyl]piperazine with thiosemicarbazide. The bis(hydrazinecarbothioamide) was used as a building block for construction of a novel bis(thiazolyl)piperazines via its cyclocondensation with a series of each of α‐halocarbonyl compounds and hydrazonoyl halides in dimethylformamide in the presence of triethylamine as a catalyst under microwave irradiation. The structure of the newly bis(thiazolyl)piperazine derivatives is elucidated via the spectral data as well as elemental analyses. 相似文献
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