Preparation of spheres based on NiO using cation with gel and macroporous structure

The article discusses the production of materials based on nickel oxide in the form of spherical granules ranging in size from 300 to 700 nm, by the method of thermal destruction of cation exchangers with gel (TOKEM-100)and macroporous (TOKEM-250) structures saturated with nickel (II) ions. Thermal analysis was used to establish the temperature regimes of annealing of Ni2+–ТОКЕМ-250 и Ni2+–ТОКЕМ-100 samples. The prepared materials were investigated by XRD and SEM. The use of TOKEM-100 cation exchanger makes it possible to obtain samples with spherical granules based on trigonal nickel (II) oxide, characterized by a sintered surface morphology. The use of TOKEM-250 cation exchanger leads to the formation of spheres based on NiO cubic modification with an inhomogeneous surface morphology.

Copper Rich Composite Materials Based on Carboxylic Cation Exchangers and Their Thermal Transformation

The effect of a cupric deposit (Cu2+, CuO) on the thermal decomposition of carboxylic cation exchangers (CCEs) is not known, and such studies may have practical significance. CCEs have a very high ion exchange capacity, so an exceptionally large amount of CuO (which is a catalyst) can be precipitated inside them. Two CCEs, macroreticular (Amberlite IRC50) and gel-like (Amberlite IRC86), served as a polymeric support to obtain copper-rich hybrid ion exchangers. Composites with CuO particles inside a polyacrylic matrix (up to 35.0 wt% Cu) were obtained. Thermal analyses under air and under N2 were performed for CCEs in the H+ and Cu2+ form with and without a CuO deposit. The results of sixteen experiments are discussed based on the TG/DTG curves and XRD patterns of the solid residues. Under air, the cupric deposit shifted the particular transformations and the ultimate polymeric matter decomposition (combustion) toward lower temperatures (even about 100–150 °C). Under N2, the reduction of the cupric deposit to metallic copper took place. Unique composite materials enriched in carbonaceous matter were obtained, as the products of polymeric matrix decomposition (free radicals and hydrogen) created an additional amount of carbon char due to the utilization of a certain amount of hydrogen to reduce Cu (II) to Cu0.

SLC47 family of multidrug and toxin extrusion transporters in GtoPdb v.2021.3

These proton:organic cation exchangers are predicted to have 13 TM segments [12] and are suggested to be responsible for excretion of many drugs in the liver and kidneys [1].

Study of the possibilities of integrated treatment of flue gases and waste water from coal-fired heat power plants

The results of laboratory studies carried out to identify the possibility and effectiveness of technologies for the complex recycling of components of flue gases and wastewater from thermal power plants and industrial boilers are presented. The following factors were investigated: the degree of saturation of water solutions with carbon dioxide, the efficiency of using these solutions for the regeneration of cation exchangers, the properties of regeneration solutions intended for the regeneration of cation exchange filters prepared using components of flue gases obtained from the combustion of organic fuel in the laboratory by saturating water of various compositions, the degree of saturation of condensate and waste water with components of flue gases, as well as the degree of regeneration of cation exchangers with such regeneration solutions. After research in the laboratory, a laboratory installation was created in an industrial environment to determine the properties of solutions obtained from wastewater and flue gases obtained after production processes at a power plant. The technologies were developed for the complex recycling of flue gases and waste water from thermal power plants with the production of carbon dioxide with a purity of 99.9%, technical nitrogen with a purity of 95%, special solutions for the regeneration of cation exchangers in water purification plants of industrial enterprises. The results obtained make it possible to minimize the volume of emissions into the atmosphere and the volume of waste water from thermal power plants

Design and application of purified water preparation device for chemical analysis

Qualified purified water is essential for all chemical analysis. Spectral analysis, trace analysis and general chemical analysis require different purity of water. This paper introduces a kind of purified water preparation device which can be widely used in all chemical analysis work. The purified water preparation device consists of two-stage reverse osmosis device and water treatment device of ion exchange system. The two-stage reverse osmosis water treatment unit can be operated in two modes: program-controlled and manual mode, and the water production rate is about 80%. The ion exchange water treatment unit consists of two cation exchangers, two cation exchangers and one mixed ion exchanger, which can prepare silicon free water and sodium free water and meet the requirements of trace analysis. The ion exchange water treatment unit is equipped with independent purified water pipeline system and regenerated liquid pipeline system to avoid the pollution of purified water. The regeneration operation of ion exchange resin is simple, and the discontinuous water production can be easily realized. This set of purified water preparation device can adapt to various water sources to complete purification treatment, and produce purified water meeting various chemical analysis.

THE ROLE OF SORPTION PROCESSES IN THE TRANSMEMBRANE TRANSFER OF ALKALINE METAL SALTS THROUGH A NANOFILTRATION MEMBRANE

The article provides data on the effect of the concentration of I-I electrolyte salt on the transfer through the Vontron VNF 1812 nanofiltration membrane. Data for NaNO3, NaCl, NaHCO3, NaH2PO4 and alkali metal nitrates are presented. The experimental data obtained suggest that the flux of water and salt are determined by the interaction of anions with protonated amino groups, which are part of the material of the selective membrane layer. An increase in the transmembrane flux of alkali metal nitrates is observed in the series CsNO3>KNO3>NaNO3>LiNO3. This series is opposite to the series of selectivity in the sorption of metals on carboxyl cation exchangers, but this series coincides with the series of increasing diffusant mass. It is noted that for all the solutions under study, water transfer can occur at an operating pressure significantly lower than the osmotic pressure calculated by the Van't Hoff equation, which indicates the essential role of filtration in the traditional understanding of this term