adsorption

An alternative method of purification of aqueous sulfide-alkaline effluents from sulfide and hydrosulfide ions by their adsorption with mixed sorbents based on activated charcoal and kieselguhr has been investigated. High adsorption efficiency of mixed sorbents for purification of model sulfide- and hydrosulfide-containing solutions has been established. The dependence of the extraction degree of sulfide and hydrosulfide ions from aqueous solutions on their concentration, adsorption time and sorbent mass used has been investigated.

The purpose of this work was to study the process of adsorption of phosphate on natural and synthesized sorbents, such as aluminosilicates. The sorption properties of natural zeolite for phosphate under static and dynamic conditions were investigated. The zeolite on the basis of the coal fly ash of Dobrotvorskaya heat power plant was synthesized and modified. The equilibrium values of adsorption capacity were determined, and the corresponding isotherms were constructed at a temperature of 20° C. The kinetics of adsorption under mechanical mixing conditions was investigated.

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.

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.

The article considers an actual but not sufficiently developed problem of attractiveness for the subjects of entrepreneurial activity of adsorption extraction of Nickel ions (II) by bentonite clays. The basic social and psychological mechanisms for the adoption of environmentally-oriented activities are analyzed. The styles of entrepreneurs’ response to the attractiveness of adsorption extraction of Nickel ions (II) by bentonite clays are characterized. The process of sorption of Nickel ions (II) with a fixed layer of sorbent by bentonite clays is investigated.

The problem of permanent and prolonged pollution of soils by various kinds of pollutants, in particular heavy metals, was analyzed. Experimental investigations of penetration of copper sulfate into a vertical soil profile have been carried out. The adsorption capacity of the sandy environment of copper sulfate
was experimentally determined.