ADSORPTION OF IONS LANTAN ON KAOLIN
Journal Title: Вісник Одеського національного університету. Хімія - Year 2018, Vol 23, Issue 4
Abstract
The results of studies of the adsorption of lanthanum ions from aqueous solutions of kaolin are presented. It has been shown that kaolin is a fairly effective adsorbent of lanthanum ions from aqueous solutions with different pH values. The kinetics of the adsorption of lanthanum ions by kaolin was studied. It was shown that the rate of adsorption of lanthanum ions on the surface of kaolin particles at pH 6 is higher than at pH 3. The adsorption process is described by an equation similar to the first-order equation. The found graphically values of the adsorption rate constants increase when they are going from pH 3 (0.01 min-1) to pH 6 (0.12 min-1). The isotherms of adsorption of lanthanum ions by kaolin have a complex form and, according to Giles’s classification, belong to L-type isotherms. The description of the adsorption process was carried out by models of Freundlich, Langmuir, Hill – de Bura. The values of the correlation coefficients (R2) in the linearization of the isotherm of the monomolecular adsorption of lanthanum ions by kaolin particles show that the adsorption with the maximum probability is described by the Langmuir equation. The effect of pH and temperature in the range of 293-313 К on the process of lanthanum adsorption by kaolin particles was studied. It is shown that the value of adsorption increases with increasing temperature, which indicates the chemical nature of adsorption. Adsorption proceeds most efficiently in media with a pH of 8. Using the Dubinin-Radushkevich model, which indicates the nature of the adsorbate adsorbate on the adsorbent, the average free adsorption energy was calculated. The calculations showed that the values of the free adsorption energy E are in the range from 8 to 11 kJ/mol, which indicates the chemical nature of the interaction of the adsorbate with the adsorbent. Thus, the process of adsorption of lanthanum ions on the surface of kaolin proceeds by the ion-exchange mechanism, and the fixation of lanthanum ions has a chemical nature.
Authors and Affiliations
M. A. Kozhemiak
Keywords
Related Articles
- EP ID EP494062
- DOI 10.18524/2304-0947.2018.4(68).147822
- Views 65
- Downloads 0
THE INFLUENCE OF ALLOYING FILM-FORMING MATERIAL ZnS ON OPERATIONAL PROPERTIES OF COATINGS
The structure and properties of film-forming material ZnS containing oxide impurity are studied. Methods of the chemical analysis and spectroscopic research of products of exchange reactions establish the content of ZnO...
THYMOL ESTER OF GAMMA-AMINOBUTYRIC ACID: SYNTHESIS AND ANTICONVULSANT ACTIVITY
Thymol ester of gamma-aminobutyric acid (GABA) − 2-isopropyl-5-methylphenyl 4-aminobutyrate hydrochloride − was synthesized via Steglich esterification and characterized by 1H NMR, IR and mass spectral studies. The antic...
THE INTERACTION OF DPPHRADICAL WITH CIS-TETRACHLORODI-µ-CARBOXYLATES OF DIRHENIUM(III)
The antiradical activity of cis-tetraсhlorodi-μ-carboxylate of dirhenium(III) with 2,2-diphenyl-1-picrylhydrazyl (DPPH) was studied by electron absorption spectroscopy.It is known that in the visible region of the spectr...
CATALYSTS BASED ON UKRAINIAN NATURAL SORBENTS FOR LOW-TEMPERATURE CARBON MONOXIDE OXIDATION MEANT FOR INDIVIDUAL RESPIRATORY PROTECTIVE DEVICES
In spite of a great number of patented formulas of catalysts for neutralization of carbon monoxide (CO) which is the most widespread atmospheric pollutant, only batch-produced hopcalite and alumina supported palladium (P...
SYNTHESIS, STRUCTURE AND PROPERTIES OF MALATO GERMANIUM COMPLEXES OF VARIOUS TYPES
The optimal conditions for the isolation and structure malatogermanium complexes with smetals (Mg, Ca, Ba) and organic ekzoligands (nicotinic acid, nicotinamide) have been determined. The resulting coordination compounds...