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Bulletin of the Karaganda University Chemistry series
ISSN
2518-718X
2663-4872
3 результаты
Показано: 1 - 3 из 3
- Некоторые метрики заблокированы вашиминастройками согласия
Тип записи:Публикация, Specific features of praseodymium extraction by intergel system based on polyacrylic acid and poly-4-vinylpyridine hydrogels(2021-09-27); ; А. М. ImangazySome technological solutions contain valuable components and can become an additional source of rare-earth elements to satisfy the current production demands. This research provides the study on using a combination of polyacrylic acid hydrogel (hPAA) and hydrogel of poly-4-vinylpyridine (hP4VP) in different molar ratios for praseodymium ions sorption from its nitrate solution. The mutual activation of the hydrogels in an aqueous medium provides their transformation into a highly ionized state by the conformational and electrochemical changes in properties during their remote interaction. The electrochemical properties of solutions were studied by the methods of electrical conductivity, and pH measurements of the solutions. The research showed that the maximum activation of hydrogels was revealed within the molar ratio of hPAA:hP4VP equal to 1:5. Moreover, the total praseodymium ions sorption degree after 24 hours of sorption by individual hPAA and hP4VP was 54 % and 47 %, respectively, whereas the praseodymium ions sorption degree by the hPAA–hP4VP intergel system in the molar ratio 1:5 became 62 %. A slight increase in the sorption degree of praseodymium ions by the intergel system in comparison with individual hydrogels can be explained by the achievement of a higher ionization degree of hydrogels being activated in the hPAA–hP4VP interpolymer system by the remote interaction effect.Цитирования (OpenAlex) 9Цитирования (OpenCitations) 9 - Некоторые метрики заблокированы вашиминастройками согласия
Тип записи:Публикация, Features of the extraction of yttrium and lanthanum with an intergel systembased on hydrogels of polyacrylic acid and poly-4-vinylpyridine(2020-03-30); ; ; ; Talkybek JumadilovFeatures of the extraction of yttrium and lanthanum with an intergel system based on hydrogels of polyacrylic acid and poly-4-vinylpyridineTo predict the sorption activity and selectivity of hydrogels, the effect of mutual activation of polymer networks in the intergel system was studied.The intergel system of the hydrogel of polyacrylic acid ((hPAA)) and the hydrogel of poly-4-vinylpyridine (hP4VP), which was studied at a distance through the volume of the solvent in the absence of direct contact between the polymer networks, were chosen as the object of study.Intergel systems have been investigated using methods for measuring electrical conductivity, pH, and gravimetry.The mutual activation of La 3+ and Y 3+ ions with the intergel system in an aqueous medium was also studied.It has been established that as a result of the remote interaction of the studied hydrogels, their mutual activation occurs, leading to a significant change in their electrochemical and conformational properties.At certain ratios of acidic and basic hydrogels, a significant increase in the sorption of lanthanum and yttrium ions is observed in comparison with the initial hydrogels.These results indicate the appearance of ionized structures with optimal conformation, providing an optimal ligand environment around lanthanum and yttrium ions.Цитирования (OpenAlex) 5Цитирования (OpenCitations) 2 - Некоторые метрики заблокированы вашиминастройками согласия
Тип записи:Публикация, Composition and structure of bismuth doped dysprosium manganite(2018-09-29); ; ; ; KezdikbayevaComposition and structure of bismuth doped dysprosium manganiteIn the present work, the multiferroic material Bi 0.8 Dy 0.2 MnO 3 was synthesized by the Pechini method for its further study.As starting materials, bismuth oxide, manganese oxide, dysprosium oxide, nitric acid and urea were used.It is shown that when nitric acid and urea are used as a precipitant, single-phase powders can be obtained.The powder was sintered at various temperatures of 600 ºC, 800 ºC, 900 ºC, respectively, in order to evaluate their optimum sintering temperature based on X-ray profiles.The incorporation of Bi 3+ ions into the perovskite crystal structure was verified by means of X-ray, SEM methods.The XRD revealed that the obtained nanocrystalline Bi 0.8 Dy 0.2 MnO 3 was cubic crystal structure of space group: Fm-3m(225) and lattice parameters were: 5.4763 Å, 5.4763 Å, 5.4763 Å, 90.000, 90.000, 90.000.The density of manganite was determined by the pycnometric method in accordance with State Standard 2211-65.Toluene served as an indifferent fluid.Satisfactory consistency of X-ray and pycnometric densities of manganite confirms the correctness of the results.The results of the electron microscope show that the atomic fractions of the elements practically coincide, which corresponds to the formula of manganite-BDMO.