сорбція

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.

The present study aims to describe new low cost activated carbons which were prepared from bean peel (BP), acorn peel (AP) and Pistacia lentiscus (PL) under microwave induced KOH chemical activation for the removal of methylene blue dye from aqueous solutions. Activated carbons were characterized using, thermogravimetric analysis, and scanning electron microscopy. The adsorption properties were examined considering several parameters including the effect of pH, contact time, adsorbent dosage and initial concentration.

The statics and kinetics of albumin adsorption on natural zeolite of clinoptilolite structure have been investigated. The basic characteristics of zeolite have been determined. The method of albumin in a solution analysis was given. An isotherm of albumin adsorption was plotted and the Langmuir equation describing this isotherm was given. The presence of an external and pore diffusion adsorption mechanism has been experimentally established during the study of kinetics in a machine with mechanical stirring.

The effect of concentration and temperature were studied to measure the inhibiting capacity of extract Opuntia ficus-indica by using polarization and electrochemical impedance spectroscopy. The adsorption of the studied extract on carbon steel surface obeys the Langmuir adsorption isotherm.

The sorption of Pb2+ ions was conducted in a fixed-bed column by using nano-hydroxyapatite granules. The breakthrough and exhaustion time decreased with increasing flow rate, decreasing bed depth and increasing influent lead concentration. The proposed mechanism is a partial dissolution of calcium followed by the precipitation of an apatite by the ion-exchange mechanism with the formula Ca10−xPbx(PO4)6(OH)2 and Pb10(PO4)6(OH)2.

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

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 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.

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