сорбція

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

Sorption ability of intergel system polymethacrylic acid hydrogel (gPMAA) – poly-4-vinylpyridine hydrogel (gP4VP) in relation to lanthanum ions is studied. Hydrogels mutual activation in an aqueous medium, particularly dependencies of swelling coefficient, specific electric conductivity and pH of water solutions are studied. Maximum activation of hydrogels occurs at gPMAA:gP4VP molar ratio 3:3. Maximum total binding degree of polymer chain in the intergel system is observed at the ratio gPMAA:gP4VP = 1:5.