Alumina, modified with polyhexamethylene guanidine (Al2O3–PHMG), was suggested for simultaneous preconcentration and determination of food dyes using diffuse reflectance spectroscopy. Adsorption synthetic the Sunset Yellow (E110) Ponceau 4R (E124) studied; Al2O3–PHMG adsorbent extracted in a wide range acidity at pH 1–8. Synthetic were quantitatively 1-2 5-6. The best adsorption capacity observed 1–2 95 85 μmol g-1 4R, respectively. maxima bands spectra 470 nm (Sunset Yellow) 510 (Ponceau...

Pine sawdust and malt sprouts modified with orthophosphoric acid carbamide have been proposed for solid-phase extraction (SPE) of nonferrous, heavy, precious metals their subsequent determination in the environmental samples by inductively coupled plasma optical emission spectrometry (ICP-OES). Modified adsorbents were characterized SEM, TGA, FT-IR compared native matrixes. SPE some nonferrous metal ions biosorbents was studied. Depending on conditions, it possible to separate heavy from...

Novel silica-based adsorption materials layer-by-layer modified with polyhexamethylene guanidine and Arsenazo I or III have been proposed for solid-phase extraction of rare earth elements (REE). Silica, I, quantitatively extracted REE at pH 5.5 − 7.0, silica, III, 2.0–6.0 distribution coefficients 2.9 · 103–4.6 104 cm3 g−1. The capacity was 1.25–2.85 mg used removal from solutions after digestion lignites ashes their burning.

Silica-based adsorbents (Silica gel 60 and Silochrom S-80) chemically modified with aminophosphonic groups various surface concentrations have been proposed for the preconcentration of rare earth elements (REE). The resulting were studied by FT-IR, SEM, TGA compared unmodified matrices. Adsorbents quantitatively extracted REE from solutions pH 1.0–5.0. Solid phase extraction at 1.0–2.0 made it possible to separate predominant amounts accompanying metal ions. An increase in concentration on...

Biosilica-based adsorbents prepared from rice husk, sequentially modified with polymeric polyamines and carboxyarsenazo were proposed for the preconcentration of 13 lanthanides, La, Sc, Y. It is shown that adsorbent quantitatively extracted rare earth elements (REEs) solutions pH 3.5–6.5.

Silicas chemically modified with a number of sulfur-containing groups (mercaptopropyl, mercaptophenyl, dipropyl disulfide, thiadiazole thiol, dithiocarbamate and thiourea derivatives) were proposed for the separation preconcentration precious metals. These adsorbents quantitatively extracted metals from 0.5 to 4 M solutions hydrochloric acid. It allowed their high concentrations non-ferrous, alkaline earth, alkali some other related The selectivity kinetically labile metal ions in ligand...

Coal fly ash hollow aluminosilicate microspheres (cenospheres) of stabilized composition (glass phase—95.4; (SiO2/Al2O3)glass—3.1; (Si/Al)at. = 2.6) were used to fabricate lutetium-176 encapsulated as precursors radiolabeled applied for selective irradiation tumors. To incorporate Lu3+ ions into cenosphere’s material, the following strategy was realized: (i) chemical modification cenosphere globules by conversion glass zeolites preserving a spherical form cenospheres; (ii) loading zeolitized...

The conditions for solid-phase extraction of the synthetic food dye Fast Green FCF (E 143) by basic and modified with polyhexamethylene guanidine alumina (Al2O3-PHMG) were determined. equilibration time E143 was 15 min both adsorbents. Quantitative Al2O3-PHMG achieved in ranges pH 1.0–3.0 6.5–7.5. maximum observed range 2.0–5.0 did not exceed 80%. adsorption capacity adsorbents 20 µmol g-1 Al2O3, 35 at 1 11 6.5. experimental isotherms 6.5 are best fitted Langmuir model. isotherm Al2O3...

The paper is concerned with (i) the hydrothermal synthesis of hydrous zirconium dioxide (HZD) bearing analcime (HZD-ANA, zirconia-analcime) and (ii) its sorption properties respect to Cs+ Sr2+. HZD-ANA particles were synthesized from coal fly ash cenospheres composed aluminosilicate glass (SiO2/Al2O3)wt.=3.1 characterized by PXRD, SEM-EDS, STA, low-temperature N2 adsorption. non-radioactive simulant solutions different acidity (pH=2–10) Cs+/Sr2+ content (0.5–50.0 mg/L) used in work. effect...

Novel silica-based adsorbent layer-by-layer modified with polyhexamethylene guanidine and 7-iodine-8-hydroxyquinoline-5-sulphonic acid (Ferron) was used for preconcentration adsorption-fluorimetric determination of Zn(II). A simple express method preparation is described in the present work. The prepared extracts Zn(II) from solutions pH 5.0–7.0, formation a luminescent complex λlum = 500 nm (λex 380 nm) on surface. An developed natural water using sequentially Ferron; detection limit 4 µg...

Silica based adsorbent sequentially modified with polyhexamethylene guanidine and 7-iodine-8-hydroxyquinoline-5-sulfonic acid (Ferron) was proposed for adsorption-photometric test-determination of Fe(III) in natural water. During adsorption from solutions pH 2.0-3.5 became green colored. Formation green-colored surface complex Ferron the maximum diffuse reflectance spectrum at 600 nm used developing procedure its determination. Detection limit calculated by 3s-criterion 0.03 μg/0.1 g (3 μg/L...

Coal fly ash hollow aluminosilicate microspheres (cenospheres) of stabilized composition (glass phase > 90 wt. %) were used to fabricate lutetium/yttrium-aluminosilicate as precursors Lu-177 and Y-90 bearing β-irradiation sources applied for the selective radiation therapy tumors. The zeolitized containing zeolite NaP1 (GIS) synthesized their sorption properties with respect Lu3+/Y3+ studied. fast heating–cooling cycle at 1200 oC in a moving bed resulted amorphization component without...

A complex approach to the extraction of gallium from a carbon concentrate (CC), waste product aluminium industry, was considered. Ashing CC made it possible remove main component - and obtain ash, which is an oxide mineral-like compound, leached with solutions inorganic acids their mixtures. The maximum degree leaching (98%) achieved 6 M HCl for ash after ashing at 600°C. It shown that Purolite anion exchangers highly basic tertiary quaternary ammonium base groups recovered gallium(III) 2–10...

Rare elements, including rare earth metals (REM), germanium and gallium are widely used in various fields of science technology. Germanium the semiconductor industry, rare-earth structural materials for aviation space, as well nuclear energy. The sufficiency with own raw is a strategic issue producers metal materials. Despite vast reserves deposits Russia, they far from developed infrastructures characterized by complex enrichment

The effect of the hydrothermal synthesis conditions (temperature, duration, mixing), composition, and presynthetic processing narrow fractions cenospheres fly ash, which act as a template source Si Al, on production microspherical zeolite materials given structural type in Na2O–H2O–(SiO2–Al2O3)glass two molar compositions is studied. products are characterized by XRD, SEM-EDS, low-temperature nitrogen adsorption, their sorption properties relation to Cs+ Sr2+ factors contributing predominant...