scholarly journals SORPTION OF BISMUTON (III) IONS FROM AQUEOUS SOLUTIONS BY SILICAS MODIFIED BY ORGANIC REAGENTS

2021 ◽  
Vol 26 (2(78)) ◽  
pp. 73-88
Author(s):  
A. N. Chebotarev ◽  
D. V. Snigur ◽  
D. O. Barbalat ◽  
O. M. Rakhlytskaya ◽  
O. M. Zhukovetska ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Solid Phase ◽  
Test System ◽  
Covalent Immobilization ◽  
Pyrocatechol Violet ◽  
Organic Reagents ◽  
Dilute Aqueous Solutions ◽  
Unmodified Silica ◽  
Analytical Reagents ◽  
Modified Adsorbents

In current paper, adsorbents based on silica L 40/100 modified with 4-(2-pyridylazo)resorcinol, 1-(2-pyrylazo)naphthol‑2, pyrocatechol violet and sodium N, N‑diethyldithiocarbamate were obtained. Adsorbents were modified by non-covalent immobilization of organic analytical reagents on the silica surface. It is noted that the preparation of such adsorbents is fast and easy to manufacture. The conditions of Bismuth (III) adsorption from dilute aqueous solutions by the proposed adsorbents are studied and optimized. The optimal values of the medium acidity for the effective Bismuth (III) preconcentration by the proposed adsorbents based on silica modified with organic analytical reagents have been established. It is shown that the use of modified silicas allows efficient (95–98%) removal of Bismuth (III) from dilute aqueous solutions. Under optimal adsorption conditions, the capacity of modified adsorbents is determined. It is established that the modification of silica leads to a significant (2–3 times) increase in the capacity of the obtained sorbents by Bismuth (III) in comparison with the unmodified silica, which is associated with the processes of complexation on the surface. The desorption of Bismuth (III) from the surface of unmodified and modified silicas by solutions of mineral acids has been studied. It is shown that Bi(III) is quantitatively desorbed from the surface of unmodified silicas by solutions of sulfuric and nitric acids, and in the case of modified silicas the degree of desorption is small and does not exceed 35%. The data obtained can then be used to develop a test system for determination of Bismuth (III) via corresponding colorimetric scales or for quantitative solid phase extraction and adsorption-spectroscopic quantification of Bismuth (III) in some real samples.  

Preparation of 1-(2-pyridylazo)-2-naphthol functionalized benzophenone/naphthalene and their uses in solid phase extractive preconcentration/separation of uranium(VI)

2003 ◽  
Vol 91 (5) ◽  
Author(s):  
C. R. Preetha ◽  
T. Prasada Rao
Keyword(s):  
Aqueous Solutions ◽  
Metal Ion ◽  
Solid Phase ◽  
Arsenazo Iii ◽  
Solid Mixture ◽  
Solid Reagent ◽  
Dilute Aqueous Solutions ◽  
Solid Phase Extractant ◽  
Ph Range

SummaryThe preparation of solid reagent 1-(2-pyridylazo)-2-naphthol functionalized benzophenone/naphthalene for preconcentration/separation of uranium (VI) is described. These reagents enriches uranium(VI) quantitatively from dilute aqueous solutions in the pH range 10.5-11.0. The solid mixture consisting of the enriched metal ion along with solid phase extractant were dissolved in 2ml of acetone and uranium(VI) content was established spectrophotometrically by using Arsenazo III procedure. Calibration graphs were rectilinear over the uranium(VI) concentration in the range 0.002-0.1μg cm

scholarly journals SORPTION OF ERYTHROSINE ONTO SILICA GEL MODIFIED BY CETYLPYRIDINIUM BROMIDE

2021 ◽  
Vol 26 (3(79)) ◽  
pp. 77-85
Author(s):  
O. M. Guzenko ◽  
O. M. Zhukovetska ◽  
D. M. Mukienko ◽  
V. V. Shopovalenko ◽  
A. N. Chebotarev ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Silica Gel ◽  
Solid Phase ◽  
Ion Pairs ◽  
Sodium Dodecylsulfate ◽  
Test System ◽  
Competitive Sorption ◽  
Cetylpyridinium Bromide ◽  
Modified Silica Gel ◽  
Water Desorption

In the current paper, adsorbent based on silica gel L 40/100 modified with cetylpyridinium bromide was obtained. The presence of cetylpyridinium cations on the silica gel surface was confirmed by the diffuse reflectance infrared fourier transform spectroscopy method. The sorption conditions of erythrosine from dilute aqueous solutions with the proposed sorbent were studied and optimized. It is shown that the use of modified silica gel allows efficient (>95%) extraction of erythrosine from aqueous solutions. Under optimal sorption conditions (pH 7, sorbent dosage 0.1 g and sorption time is 15 min), the sorption capacity of modified erythrosine sorbents was determined. It is shown that, with increasing temperature, a change in the isotherm type from the H‑type to the L‑type is observed. This change can be explained by the aggregation of erythrosin in solution, which is a competitive sorption process. It was shown that adsorption isotherms were well described by the Langmuir equation. Thermodynamic studies have made it possible to establish the spontaneous sorption. The desorption of erythrosine from the surface of silica gel modified with cetylpyridinium bromide was studied. It is shown that when using solutions of sulfuric acid, sodium hydroxide and distilled water, desorption does not occur. It was shown that the most effective eluent is solution of sodium dodecylsulfate in alkaline medium, and desorption of erythrosine occurs due to the destruction of ion pairs of dye anions with cetylpyridinium cations fixed on the surface. The data obtained can then be used to develop a test system for determination of erythrosine via corresponding colorimetric scales or for quantitative solid phase extraction and adsorption-spectroscopic quantification of erythrosine in some real samples.

The reactions of oligoalcohols with arsenic, arsenous, boric and germanic acids

1980 ◽  
Vol 45 (10) ◽  
pp. 2645-2655 ◽  
Author(s):  
Antonín Mikan ◽  
Miloš Bartušek
Keyword(s):  
Aqueous Solutions ◽  
Equilibrium Constants ◽  
Dilute Aqueous Solutions

The reactions of sorbitol, mannitol, adonitol, dulcitol, glucose and glycerol with H3AsO4, H3AsO3, H3BO3 and GeO2 acids in dilute aqueous solutions were studied by potentiometric neutralization titrations. The formation of the following chelates was demonstrated: As(V)L3-, As(III)L(OH)2-, HAs(III)L(OH)2, BL2-, GeL2(OH)- and GeL32- and the equilibrium constants for their formation were found. Conditions for formation of these chelates of organic oligohydroxy compounds are discussed.

Study of potential oscillations during reaction of an aluminium single crystal with an aqueous KOH solution

1990 ◽  
Vol 55 (2) ◽  
pp. 345-353 ◽  
Author(s):  
Ivan Halaša ◽  
Milica Miadoková
Keyword(s):  
Aqueous Solutions ◽  
Single Crystal ◽  
Single Crystals ◽  
Periodic Potential ◽  
Optimum Conditions ◽  
Potential Oscillations ◽  
Dilute Aqueous Solutions ◽  
Experimental Findings ◽  
Kinetics Of

The authors investigated periodic potential changes measured on oriented sections of Al single crystals during spontaneous dissolution in dilute aqueous solutions of KOH, with the aim to find optimum conditions for the formation of potential oscillations. It was found that this phenomenon is related with the kinetics of the reaction investigated, whose rate also changed periodically. The mechanism of the oscillations is discussed in view of the experimental findings.

Extraction of explosive compounds from aqueous solutions by solid phase extraction using β-cyclodextrin functionalized carbon nanofibers as sorbents

2016 ◽  
Vol 4 (2) ◽  
pp. 2450-2457 ◽  
Author(s):  
Nikita Tawanda Tavengwa ◽  
Nomso Hintsho ◽  
Shane Durbach ◽  
Isabel Weiersbye ◽  
Ewa Cukrowska ◽  
...  
Keyword(s):  
Solid Phase Extraction ◽  
Aqueous Solutions ◽  
Carbon Nanofibers ◽  
Solid Phase ◽  
Phase Extraction

A tensammetric study of polyacrylamides, including their determination

1988 ◽  
Vol 66 (10) ◽  
pp. 2658-2663 ◽  
Author(s):  
Truis Smith-Palmer ◽  
Byron R. Wentzell ◽  
John C. Donini ◽  
Robert J. Jerrard
Keyword(s):  
Aqueous Solutions ◽  
Limits Of Detection ◽  
Dilute Aqueous Solutions ◽  
Phase Sensitive

Phase-sensitive tensammetry is shown to be a convenient and useful way to analyse polyacrylamides and associated derivatives (pams) in dilute aqueous solutions. Standard curves were obtained with ranges varying from 9 to 25 ppm and limits of detection varying from 0.7 to 2 ppm. Ways to change the range and sensitivity are discussed and demonstrated. Typical interferences and their effects are tabulated, and the analysis of pams in coal washings is discussed. The analysis of certain mixtures of polyacrylamides is shown to be possible.

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