Selection of absorbent materials for the extraction of nickel and cobalt from the ore of the Gornostaevskoye deposit. At the end of absorption, the sorbent was removed from the columns, washed with distilled water and analyzed for the content of sorbed elements. At the end of the drainage, the pulp is filtered and the solution is analyzed for the content of the main components.
The kinetic curves of the sorption of nickel and cobalt from a given solution by the studied sorbents in the Na+ form are shown in Figure 1 and Figure 2. The dependence of the degree of desorption of nickel and cobalt on the nature of the eluent for the Amberlite IRC 748 sorbent was studied (Table 4).
Panova et al
Conclusion
Sorbciya ionov nikelya(II) na cationite s helatnimi gruppami iminodiuksusnoi kisloti] // Notes from the university. Influence of the third component on the sorption of Ni2+ cations by polystyrene-(4-azo-1')-2'-hydroxy-5'-nitrobenzene [Vliyanie tretego komponenta na process sorbcii cationov Ni2+ polistirol-(4-azo-1 ' )-2'-hydroxy-5'-nitrobenzolom] // Scientific notes of Oryol State University. 11 Basargin NN, Oskotskaya ER, Chepelev SV, Kudinova VV (2010) Scientific notes of Oryol State University.
Synthesis of nanocomposite material through
Графен оксидін наноцеллюлоза көмегімен
Синтез нанокомпозитного материала путем
This is an open access article licensed under CC BY-NC-ND 4.0 (https://creativecommons.org/licenses/by-nc-nd/4.0/).
Synthesis of nanocomposite material through modification of graphene oxide by nanocellulose
Experiment 1 Materials
3 g of NaNO3 are added to the resulting suspension, then 18 g of KMnO4 are gradually added to the mixture while stirring, maintaining the temperature below 20°C for 2 hours, then the temperature is raised to 35°C and maintained for 30 min. . At the end of the reaction, the product is filtered and washed several times in 5% HCl solution to remove the remaining metal ions. Cellulose used for modification was isolated from hemp stems (Cannabis Ruderalis Janisch) based on organosolvent oxidation [14].
To obtain NC, the 1 g of the original cellulose was weighed, cellulose with 64% H2SO4 acid was obtained as a ratio of 1:10 (g/mL) and was gradually titrated at 0-5°C. After complete mixing of the cellulose and acid, heat the mixture at 40°C in a water bath, stirring vigorously for 1 hour. The samples were stored in the crystallizer to prevent sorption of water vapor and carbon dioxide in the air.
The absorption characteristics of the obtained GO, NC and GO/NC nanocomposite in the UV range were recorded on a PE5400-UF spectrometer at a temperature of 25°C in the range of 190-1100 nm (cuvette thickness 10 mm) every 5 nm. . FTIR analysis was performed on an FTIR spectrometer FT-801 (Simex, Russia), with a resolution of 1 cm-1 and a wavelength of 450-4700 cm-1 according to the standard method using a universal total internal reflection and a disposable mirror. - diffuse reflection with the upper position of the model, at a temperature of 25°C and a number of scans of 100. The surface of the GO/NC nanocomposite is coated with aluminum for better electron transfer.
The crystal structures of the GO/NC nanocomposite were studied by X-ray diffraction on the X´PertPRO diffractometer (Malvern Panalytical Empyrean, The Netherlands) using monochromatized copper radiation (СuKα) with a scan step of 0.02°, K-Alpha1.154 [Å2 ].
Results and Discussion
The resulting suspension is separated in a centrifuge (OPn-8, Russia) at a speed of 6000 rpm, stirring for 15 minutes. The average particle size was determined by Zetasizer NanoZS 90 (Malvern, UK) dynamic laser light scattering. The measurement angle was 10–45°, the X-ray tube voltage was 45 kV, the current was 30 mA, and the measurement time at each step was 0.5 s, and an aluminum rectangular multi-function sample holder (PW1172/01) was used for the reflection mode measurement.
Akatan et al
The broad absorption band that occurs in the range from 3300 cm−1 to 3500 cm−1 is characterized by the valence stretching vibration of the О–Н groups. It can be seen that the results of the study agree well with the work [24,25]. One of the significant changes in the IR spectrum is the appearance of valence stretching vibration of the ether carboxyl.
SEM images showing CNF as a contact layer between ultra-low thickness GO layers. Some of the GO sheets were embedded perpendicularly (standing) to the membrane surface, while most of the GO is assembled horizontally on top of the CNF. It can be seen that the results of the study are consistent with the literature [26].
The obtained GO and NC average particle sizes of the GO and NC were 352 nm, 470 nm in length and 80 nm in width. The SEM analysis showed the NC as a contact layer between ultra-low thickness of the GO layers. Preparation of a colloidal graphene oxide solution from natural coal // Reports of the National Academy of Sciences of Ukraine.
3 Savitskyi DP, Makarov AS, Goncharuk VV (2016) Dagiti Reporta ti Nailian nga Akademia ti Siensia ti Ukrania 6:87-94.
Preparation and study of the physicochemical characteristics
Поли (этилениминде) тұрақтандырылған мыс
Получение и изучение физико-химических
Preparation and study of the physicochemical characteristics of multilayer polymer composites based on
Introduction
Research on the complexation of highly charged polyelectrolytes with metal ions and the preparation of multilayer catalytic films by the LbL method have not been sufficiently studied and the publications are episodic in nature. In this work, a study was conducted on the creation of multilayers of a positively charged PEI-CuNPs complex and a negatively charged PAMPS polyelectrolyte. It is believed that copper nanoparticles immobilized in PEI-CuNPs/PAMPS multilayers can be used as a catalytic center in the oxidation of organic substrates.
This indicated the formation of a 4:1 polymer-metal complex PEI-Cu2+ which means that 4 monomer units of PEI coordinate with one copper ion. When sodium borohydride interacted with PEI-Cu2+, the solution changed from dark blue to dark brown color (Figure 3b). The reduction of copper ions coordinated to PEI was accompanied by a short-term evolution of gaseous hydrogen.
The resulting dark brown solution of PEI-CuNPs was dialyzed for 24 h to remove low molecular weight impurities (Figure 3, c). a) b) c). The formation of four coordination complexes between the repeating units of PEI and divalent copper ions, as well as the reduction of the PEI-Cu2+ complex with sodium borohydride to the formation of CuO nanoparticles stabilized by PEI, can be depicted by the following scheme. For the deposition of multilayers, a SiO2-SurfusNanoLane substrate was used, which was kept in Piranha solution (a mixture of hydrogen peroxide and sulfuric acid in a ratio of 1:4) for 24 hours to remove organic contaminants and improve the hydrophilicity of the surface to increase.
The LbL assembly process was performed by immersing a solid base in a dilute solution of a positive charge.
S. Selenova et al
After 24 h of dialysis, the absorption spectra of PEI-CuNPs did not change significantly, and the maximum of the absorption band at 540 nm remained practically unchanged for several months. When a solution of copper acetate is added to an aqueous solution of PEI, a maximum appears in the spectrum at a wavelength of λ = 620 nm and the maximum characteristic of a pure copper solution disappears, indicating the formation of a PEI-Cu2+ complex. A histogram of the hydrodynamic size distribution of PEI-CuNP nanoparticles with an average particle size of 100 nm and a particle dispersion range of 60-300 nm is shown in Figure 10, a.
It can be seen that the distribution of copper nanoparticles in the PEI-CuNPs solution after dialysis became monomodal, that is, it also indicates the stability of the aqueous suspension of PEI-CuNPs, which is obtained by the prevalence of electrostatic repulsion between positively charged particles. which reduces the possibility of aggregation. The positive charge of the PEI-CuNPs means that it will form a polyionic complex with the negatively charged PAMPS.
A solution of positively charged polyelectrolyte - PEI-CuNPs and negatively charged polyelectrolyte - sodium poly-2-acrylamide-2-methyl-1-propanesulfonate (PAMPSNa) was used to produce multilayer films using the LbL method. 11, the substrate is uniformly coated with PEI-CuNPs/PAMPS multilayers consisting of 50 (Fig. 11, a) and 100 layers (Fig. 11, b) painted in a saturated blue color. Multilayer thin films composed of PEI-CuNPs/РAMPS were obtained by layer-by-layer deposition of positively charged PEI-CuNPs and negatively charged PAMPS on the SiO2 surface.
In aqueous solution, PEI, PEI-Cu2+ and PEI-CuNPs were characterized by UV-Vis spectroscopy, DLS and zeta-potential.
Acknowledgments
Self-assembly and catalytic activity of metal nanoparticles immobilized on polymer membrane prepared through layer-by-layer approach // ACS Applied Materials and Interfaces. Layer-by-layer assembly of versatile nanoarchitectures with different dimensions: a new perspective for the rational construction of multilayer assemblies // Chemical Society Reviews. Recyclable nano-sized Pd catalyst created in multilayer polyelectrolyte films on magnetic nanoparticle core // Journal of Molecular Catalysis A: Chemical.
Self-assembly of multilayer films containing gold nanoparticles via hydrogen bonding // Journal of Colloid and Interface Science. Rules of complexation processes of Cu2+ and Co2+ ions with polyethyleneimine and polyvinylpyridine // News of NAS RK. Polymer-metal complexes use the layer-by-layer method for obtaining polyelectrolyte multilayer films containing transition metal cations // Eurasian Chemical-Technological Journal.
Dissolution properties of amphoteric random copolymers bearing pendant sulfonate and quaternary ammonium groups with controlled structures // Langmuir. Water solution properties of polyampholytes: Effect of the net charge distribution // Journal of Polymer Science Part B–Polymer Physics. Waterproof antireflection films produced by layer-by-layer adsorption process // Japanese Journal of Applied Physics.
Fabrication of nanoporous and heterostructure thin film via a layer-by-layer self-assembly method for a gas sensor // Sensors and actuators.
Магний-ионды батареяға арналған ұнтақ висмут
Анодный материал на основе порошкообразного
Powder bismuth-based anode material for
M. Argimbayeva 1
Магний-ионды батареяға арналған ұнтақ висмут негізіндегі анодтық материал және оның қасиеттері
- Кіріспе
- Тәжірибелік бөлім
- Зерттеу нәтижелері және оларды талдау
- Қорытынды
Інжір. 2 - 0,25 моль/л Mg(N(SO2CF3)2)2/AN ерітіндісіндегі және таза АН еріткішіндегі ұнтақ-висмут анодында магний иондарының интеркаляциясы/де-интеркаляциясы. Інжір. 3 - 0,25 моль/л Mg(N(SO2CF3)2)2/AN ерітіндісіндегі поляризация жылдамдығының квадрат түбіріне анодтық және катодтық пиктік токтардың потенциалды ауысуы. Інжір. 6 - 0,25 моль/л Mg(N(SO2CF3)2)2/AN ерітіндісіндегі ұнтақ висмуттан синтезделген анодтың гальваностатикалық циклінің қисықтары.
Dendrite growth in lithium/polymer systems – A propagation model for liquid electrolytes under galvanostatic conditions // Journal of The Electrochemical Society. In Situ Synthesis of Bismuth (Bi)/Reduced Graphene Oxide (RGO) Nanocomposites as High-Capacity Anode Materials for a Mg-Ion Battery // New Journal of Chemistry. Insight into the electrochemical behavior of micrometric Bi and Mg3Bi2 as high performance negative electrodes for Mg batteries // Journal of Materials Chemistry A.
Reduction of magnesium on a bismuth substrate in dimethylformamide solution // Reports of the National Academy of Sciences of the Republic of Kazakhstan. What Activates the Mg Surface - A Comparison of Mg Dissolution Mechanisms // Journal of Materials Science & Technology. Density functional theory study of structural and electronic properties of Mg3Bi2 in hexagonal and cubic phases // The European Physical Journal Applied Physics.
Selection of absorption material for the extraction of nickel and cobalt from the ore of the Gornostaevskoye deposit ..4-12 K.
