сорбція

Anomalous Sorption of Yttrium Ions by the Mutual Activated Hydrogels in the Interpolymer System of Poly(Methacrylic Acid) and Poly(4-Vinylpyridine)

This paper considers the effect of mutual activation of poly(methacrylic acid) (PMAA) and poly-(4 vinylpyridine) (P4VP) hydrogels during their remote interaction on the degree of yttrium ions sorption from an aqueous medium. Electrochemical properties were studied by conductometry and pH measurements to predict the activation possibility of these hydrogels. pH measurements showed that at 0.1 hour, the pH values were the lowest, indicating a high content of H+ ions in the aqueous solution.

Comparative Characteristics of Polymethacrylic Acid Hydrogel Sorption Activity in Relation to Lanthanum Ions in Different Intergel Systems

Phenomena of remote interaction in intergel systems polymethacrylic acid hydrogel – poly-4-vinylpyridine hydrogel (hPMAA-hP4VP) and polymethacrylic acid hydrogel – poly-2-methyl-5-vinylpyridine hydrogel (hPMAA-hP2M5VP) have been studied. It was found that there is a decrease of specific electric conductivity, pH and swelling degree of PMAA, P4VP, P2M5VP hydrogels during lanthanum ions sorption by the intergel systems.

Characterization and Properties of Titanium(IV) Oxide, Synthesized by Different Routes

The article considers the influence of precursor type and sol-gel synthesis conditions of TiO2 on its properties. The obtained TiO2 samples were characterized by X-ray diffraction methods, electron microscopy, as a result of which it was found that all the obtained TiO2 powders have the crystallite size in a nanorange of 2.5–17 nm. It was shown that sorption-photocatalytic properties of TiO2 significantly depend on a phase composition, surface acidity, specific surface area and porosity.

Phenomenon of Remote Interaction and Sorption Ability of Rare Cross-linked Hydrogels of Polymethacrylic Acid and Poly-4-vinylpyridine in Relation to Erbium Ions

Phenomenon of the long-range effect of poly(methacrylic acid) hydrogel  poly(4-vinylpyridine) hydrogel (gPMAAgP4VP intergel system) оn erbium ions sorption was studied. It was established that the structure of the basic hydrogel had a significant impact on the self-organization of the PMAA hydrogel. The mutual activation of hydrogels was investigated in an aqueous medium. Dependencies of swelling coefficient, specific electric conductivity and pH of aqueous solutions were determined.

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.

Removal of Petroleum from Aqueous Systems by Poly(divinylbenzene) and Poly(methyl methacrylate-divinylbenzene) Resins: Isothermal and Kinetic Studies

In this study, the performance of two polymer resins was evaluated, one composed of methyl methacrylate-divinylbenzene (MMA-DVB) and the other of only divinylbenzene (DVB), for adsorption of oil in synthetic oily wastewater. The tests were carried out using two processes: (i) continuous flow, to assess the quantity of oily water that can be eluted until reaching the saturation point of resins; and (ii) batch, to obtain information about the best-fitting kinetic and isotherm models for the two resins.

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.

Removal of Methylene Blue by Adsorption onto Activated Carbons Produced from Agricultural Wastes by Microwave Induced KOH Activation

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.

Statics and Kinetics of Albumin Adsorption by Natural Zeolite

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.

Aqueous Extracts of Opuntia Ficus-Indica as Green Corrosion Inhibitor of A283C Carbon Steel in 1N Sulfuric Acid Solution

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.