Silylation of clay minerals from Cherkasy deposit (Ukraine) montmorillonite (layer silicate) and palygorskite (fibrous was performed using organosilane (3-aminopropyl)triethoxysilane (APTES). Solvents with different polarity (ethanol, toluene) were used in synthesis. The structure modified characterized by complex methods (X-ray powder diffraction, Fourier transform infrared spectroscopy, nitrogen adsorption-desorption at −196 °C thermal analysis). Studies adsorption characteristics...

The modification of the layered silicate with a structural type 2:1 montmorillonite by cationic surfactant hexadecyltrimethylammonium bromide was carried out. obtained organomontmorillonite milled for 2–25 min in high-energy planetary ball mill. and physicochemical characteristics modified mechanochemically activated were investigated using various methods such as X-ray diffraction, thermal analysis, scanning electron microscopy, energy-dispersive spectroscopy, transmission determination...

Zhovty Vody city, located in south-central Ukraine, has long been an important center for the Ukrainian uranium and iron industries. Uranium mining processing activities during Cold War resulted poorly managed sources of radionuclides heavy metals. Widespread groundwater surface water contamination occurred, which creates a significant risk to drinking supplies. Hydrogeologic geochemical conditions near large mine tailings storage facility (TSF) were characterized provide data locate, design...

Natural clay minerals are widely used in various environmental protection technologies as cheap, accessible, and effective sorbents. Considering the tasks conditions for purification of polluted waters, different methods surface modification were used. The montmorillonite by cationic surfactants (hexadecyltrimethylammonium bromide); method large-sized inorganic cations Fe, Al, Zr, Ti; applying nanoscale zero-valent iron powder to increasing efficiency water from chromium (VI) uranium (VI).

The peculiarities of sorption removal uranium (VI) compounds from the surface and mineralized groundwater using clay-supported nanoscale zero-valent iron (nZVI) composite materials are studied. Representatives main structural types clay minerals taken as clays: kaolinite (Kt), montmorillonite (MMT) palygorskite (Pg). It was found that obtained samples sorbents have much better properties for waters compared to natural clays nZVI.It is shown in mainly anionic form, namely form carbonate...

The object of research is bentonite clays, the main rock-forming mineral which montmorillonite. This natural silicate exhibits sorption capacity for heavy metal ions due to its high cation exchange and specific surface area. One most problematic uses montmorillonite in processes ability swell aqueous media. greatly complicates separation spent sorbent from purified water. To eliminate this drawback, granulation often used, followed by heat treatment. Moreover, various polymer compounds are...

Clay minerals are widely used to treat groundwater and surface water containing radionuclides. In our study, the method of mechanochemical activation for increasing sorption capacity natural clay mineral montmorillonite was used. By adjusting grinding time, parameters mechanochemically activated were determined. X-ray diffraction method, scanning electron microscopy, determination specific by low-temperature adsorption–desorption nitrogen characterize mechanochemical-activated...

The influence of aluminium and titanium polyhydroxocomplexes on the structural adsorption properties pillared montmorillonites has been investigated. Structural characteristics montmorillonites, such as interlayer space, specific surface area, pore size distribution are found to depend composition synthesis conditions polyhydroxocomplexes. Carried out researches sorption uranium(VI) chromium(VI) showed a significant effect pH obtained materials. It shown that montmorillonite with mixed...

Lanthanide (Eu, Nd, Gd) and actinide (Th, U) adsorption in a system consisting of fulvic acid, metal ions clay minerals (montmorillonite, kaolinite, illite) was studied as function pH, ion concentration acid using spectrophotometric analysis 152 Eu tracer methods. Increasing on to the observed when humic substances were present system. The bridging polyvalent between substance complexes proposed possible mechanism.

Iron nanoparticles show great reactivity in the remediation of groundwater and soil or other environmental applications, however, persistence dispersion iron need to be improved. In this study, palygorskite hexadecyl trimethylammonium modified were used support nanoparticles. The electron microscopic study obtained materials is performed. had a core–shell structure with core being iron, shell consisting (hydr)oxides detected by X-ray diffraction patterns. sorption uranium(VI) cobalt(II) ions...

The structural and adsorption properties of montmorillonite pillared with titanium iron polyhydroxocomplexes are given in the paper. It was found that composition significantly affects resultant materials. For studying basic materials, X-ray phase analysis, low-temperature nitrogen adsorption, metal ions from aqueous solutions were used.The results changes respective basal reflections, confirm presence interlayer space mineral. Synthesized minerals have a well-developed specific surface,...

The synthesis of zero­valent nano­dimension iron on the surface montmorillonite and organomontmollonite by reducing aqueous solutions Fe2+ salts sodium boronhydride was conducted. results RFA IR­spectroscopy indicate formation a monolayer SAS (HDTMA) both outer particles among structural packages montmorillonite. In this case, organofilization contributes to more dispersed iron.The physical chemical features processes sorption cleaning contaminated waters from chromium(VI) compounds using...

first_page Download PDF settings Order Article Reprints Font Type: Arial Georgia Verdana Size: Aa Line Spacing:  Column Width:  Background: Open AccessAbstract Removal of Uranium (VI) from the Water Environment Using Mechanochemical-Activated Organoclay † by Iryna KovalchukIryna Kovalchuk SciProfiles Scilit Preprints.org Google Scholar 1,2 1 Institute for Sorption and Problems Endoecology, National Academy Science Ukraine, 03164 Kyiv, Ukraine 2 Department Chemical Technology Ceramics...

Freshwater crayfish farming is a promising area of production in the food market. This aquaculture industry currently gaining popularity around world, but given high consumer demand, it requires modernisation. The efficiency based on introduction innovative methods into processes, which are knowledge biological characteristics, including reproductive capacity and embryonic period caviar development. study aims to assess quality females determine incubation caviar, its quantity, weight,...

Using the macro-electrophoresis method, electrosurface properties of synthesized composite sorbents were experimentally determined. It was found that their surface has a mosaic structure contains functional groups, different in chemical behavior, causing sorption properties.The physicochemical characteristics processes water purification from chromium(VI) and uranium(VI) compounds using sorption-reduction materials based on nanoscale Fe0 clay minerals investigated. exhibit high capacity with...

Low-cost sorption materials based on the clay mineral of smectite group—montmorillonite—were used for removal radionuclides uranium (VI) and strontium (II) from contaminated water. A wide range industrial methods such as thermal treatment, acid activation, mechanochemical activation were applied. Complex methods, SEM microscopy analysis, X-ray powder diffraction (XRD), nitrogen adsorption–desorption at −196 °C, to assess characteristics structure obtained materials. The resulted in changes...

Сорбція іонів урану(VI) залізовмісними нанокомпозитами на основі монтморилонітуПредставлено членом-кореспондентом НАН України Б.Ю

The structure and adsorption characteristics of silica -and montmorillonite-based nanocomposites are investigated. Tetraethoxysilane was used as a source silica. porous investigated by the method low-temperature nitrogen adsorption.According to research results, it found that small amount in nanocomposite samples (14 % SiO2) contributes formation material with larger specific surface area greater number meso- macropores compared original montmorillonite. This, turn, leads better diffusion...

Surface modifiсation of clay minerals from Cherkasy deposit (Ukraine) montmorillonite (layer silicate) and palygorskite (fibrous was performed using the cationic surfactant hexadecyltrimethylammonium bromide (HDTMA). The successful modification surface clays after treatment with HDTMA confirmed by X-ray analysis IR-spectra. ζ-potential measurements organo-clays showed even a zeta potential reversion negative to positive in whole acidic pH range. In this case, adsorbed molecules can form both...

We have investigated the physicochemical features of purification wastewater that are complex on its content and include a mixture heavy metal ions (Cu(II), Cd(II), Zn(II), Co(II), Cr(VI)). The phase composition structural-sorption characteristics synthesized nano-sized Fe0/kaolinite composites were studied. It was found obtained materials much better sorption properties for extraction metals from aqueous solutions in comparison with natural kaolinite. Calculations isotherms according to...