sorption

INVESTIGATION OF SORPTION / DESORPTION PROCESSES OF MEDICAL SUBSTANCES BY COMBINED HYDROGELS

Modern hydrogel healing therapies for damaged human skin, must perform a number of functions which are inherent for the skin: 1) preservation of thermal and water balance; 2) ensuring of oxygen penetration; 3) providing transportation of substances necessary for the functioning of the organism; 4) protection from mechanical damage. When using hydrogel coatings on damaged areas of the skin, they must perform, an additional function - prolonged delivery to the wound of therapeutic agents of various nature.

Improvement of Adsorption-Ion-Exchange Processes for Waste and Mine Water Purification

The increase of ecological safety level of the hydrosphere as a result of the improvement of the adsorption processes for waste and mine water purification by using natural sorbents and desalting processes via electrodialysis has been investigated. The optimal parameters of improved sorption processes with natural sorbents have been established. The mechanism of diffusion was studied by the “kinetic memory” method. Effective coefficients of pore diffusion were determined during sorption of pollutants by natural sorbents.

Adsorption of Cadmium Ions from Aqueous Solutions on Modified Sorbents

Some new modified sorbents based on opoka from Astrakhan region were obtained. A comparative study of the sorption of cadmium ions on the surfaces of the sorbents was made. Also the static adsorption isotherm of substances from aqueous solutions was studied. The change of enthalpy, isobaric-isothermal potential and entropy of sorption and kinetics of cadmium ions sorption from water solutions were calculated. The results of the study can be used for the water purification from cadmium ions

Surface characteristics of materials based on sodium liquid glass modified by polyvinyl alcohol and polyvinylpyrrolidone

The physicochemical properties of surface of the metal-containing polymer-silicate composites, which have been obtained due to compatible precipitation of water-soluble polymers and silicates under the influence of metal chlorides, such as specific surface area, the number of active centers, moisture absorption, sorption ability were studied.

THE LIQUID PHASE RECIRCULATION UNDER METHANOGENIC FERMENTATION OF CHICKEN MANURE

The article is devoted to the analysis of the methanogenesis of chicken manure with effluent’s liquid phase recycling with and without nitrogen stripping. It was determined that methanogenesis with full recirculation of the liquid phase is possible both with the sorption of ammonia nitrogen and without it. However, it was characterized by an inhibited state. Methane production was 0.51 l/l in a reactor with ammonia stripping and 0.23 l/l in a reactor without ammonia stripping. The ammonia removal efficiency was 12.5% ammonia nitrogen.

Using of silicate materials for sewage sorption treatment from heavy metals

The article presents the research results of using different types of silicate minerals, their modified forms for sewage sorption treatment. Their physical and chemical properties, the mechanisms of action and sorption efficiency of the widespread natural minerals are characterized in this paper.

The use of clinoptilolite and synthetic zeolites for removal of petroleum substances

In the present paper the sorption of petroleum substances such as diesel fuels on zeolite beds was investigated. A natural occurring zeolite clinoptilolite, and mixtures of clinoptilolite and synthetic zeolites Na-P1 and Na-X type, in the ratio 3:1, were used in this study. Natural zeolite acquired from the mine tuffs in Sokyrnytsya (Ukraine). In order to obtain synthetic zeolites, F-class fly ash (Kozienice Power Plant, Poland) with sodium hydroxide was used and later it underwent the hydrothermal conversion.

Фізико-хімічні властивості поверхні металовмісних полімер-силікатних композитів

Досліджено фізико-хімічні властивості поверхні металовмісних полімер-силікатних
композитів щодо ряду кислотно-основних індикаторів з різною природою функційних груп
та значенням pKα. Визначено вплив природи і вмісту полімерного модифікатора
(полівінілового спирту і полівінілпіролідону) та металу на кількість активних центрів і
питому площу активної поверхні полімер-силікатних композитів. Встановлено, що
сорбційна здатність металовмісних полімер-силікатних композитів має специфічний

Film hydrogels on the basis of polyvinylpyrrolidone copolymers with regulated sorption-desorption characteristics

The hydrogel film composites of biomedical purpose based on copolymers of polyvinylpyrrolidone with 2-hydroxyethylmethacrylate have been synthesized. The influence of filler nature, quantity and composition on the regularities of obtaining, structure and properties of hydrogels have been determined. Synthesized hydrogel composites are recommended to be used for the controlled drug release systems.

Hydrogels Penetration and Sorption Properties in the Substances Release Controlled Processes

The crosslinked copolymers of 2-hydroxyethylmethacrylate with polyvinylpyrrolidone as granules and membranes have been synthesized and their penetration and sorption-desorption properties have been investigated. The model of mass-transfer from the solid soluble surface through the hydrogel shell has been suggested. The developed materials are able to create encapsulated and granular polymer forms of drugs prolonged release.