Use of Microwaves to Activate Bentonite in the Processes of Sorption of Nickel Ions from Concentrated Aqueous Solutions
Journal Title: Фізика і хімія твердого тіла - Year 2018, Vol 19, Issue 2
Abstract
he physicochemical parameters of the process of sorption water purification from compounds of Nickelwith clay sorbent in static conditions are studied. The absorption isotherm of ions of this metal from concentratedaqueous solutions on samples of bentonite using ultrahigh-frequency irradiation (microwave) is analyzed. Mostcorrectly, it is described by the linear equation of Langmuir. It is shown that irradiation of this sorbent bymicrowaves in the process of nickel ion sorting almost 2 times increases the value of the marginal sorptioncapacity for this metal (in comparison with the method of "stimulation" - preliminary washing of bentonite withpure water under the action of microwaves). The results of the study of spent bentonite by scanning electronmicroscopy, energy dispersion and X-ray diffraction analysis indicate that the metal under action of themicrowave is deposited on the surface of the bentonite not only in the form of an adsorbed monolayer of ions, butalso in the form of a separate crystalline phase, nickel silicate. Changes in the acidity of the medium duringsorption purification under the action of microwave are observed: from pH ≈ 5.7 ... 6.5 (before exposure) to pH ≈6.7 ... 7.1 (after irradiation). Confirmed assumption about that under the action of microwaves in the aqueousmedium there is a partial destruction of the silicate framework of clay sorbents with the release of silicon ionsSiO32-. These ions undergo hydrolysis, as a result of which the pH of the solution increases. Also, the directdiscontinuity of the Si-O bonds in the near-surface groups ≡Si-OH is not excluded, which leads to an increase inthe number of "free" hydroxyl groups.
Authors and Affiliations
A. Kontsur, L. Sysa
Keywords
Related Articles
- EP ID EP411378
- DOI 10.15330/pcss.19.2.191-196
- Views 50
- Downloads 0
Thermoelectric Nanocomposite Materials Based on Doped Lead Telluride (Review)
A review of the problems of obtaining and research complex thermoelectric properties of composite materials doped Update the various elements of the periodic table of lead telluride semiconductor promising compound for m...
Research of High-Temperature Heat and Mass Transfer and Oxidation of Samples of Refractory Metals in the Air
The stationary modes of high temperature heat and mass transfer and the oxidation of conductors of refractory metals (tungsten and molybdenum) in the air are studied. The kinetics of oxides growth on the surface of these...
Dissipative Structures and Fractal Approach to the Formation of Non-Crystalline States
Found that the formation of fractal dissipative structures in non-crystalline solids associated with the creation of self-consistent fields of soft atomic configurations and thermal behavior of such structure-sensitive c...
Ignition and Self-Supporting Burning of Gas-Air Mixtures with Hydrogen Admixtures on Platinum Wire
The proposed work describes analytical identification of hydrogen admixture concentration and catalyst temperatures limit values beyond which catalytic flameless steady combustion of gas-air mixtures at ambient temperatu...
Effect of Solid-Phase Transformations on Plasticity Steels
Plasticity steels as dependence on concentration alloying element is researched. By example of researching ultimate strength (σ0,2) iron-carbon and iron-chrome steels is shown, that plasticity of metals depend on the sol...