Sorbent Composition Research Articles

Thermal stability evaluation of selected zeolites for sustainable thermochemical energy storage

ABSTRACT In recent times, the thermochemical energy storage (TCES) method is gaining prominence due to its high energy storage density and minimal heat losses compared to the conventional thermal energy storage (TES) methods. This paper presents the cyclability behavior of selected zeolites for the TCES applications. The zeolites were subjected to sequential desorption and adsorption processes for five times using a differential thermogravimetric analyzer (DTG-60H). To investigate their suitability for the commonly available sources of thermal energy (e.g. solar energy, industrial waste heat), the samples were heated up to 150°C. These zeolites were also tested on Brunauer–Emmet–Teller (BET) analyzer for total surface areas and pore volumes, thus to read their sorption behavior. A field emission scanning electron microscope (FESEM) equipped with an energy dispersive X-ray (EDX) analyzer was used to examine the surface morphology and elemental composition of zeolite sorbents before and after the multi-cycle test run. The changes in the mass of a material during a process, either desorption or adsorption, were notably almost the same across the cycles tested, which confirms the cyclability of the materials tested. Amongst the tested materials, Zeolite-NaY and Zeolite-HY exhibited relatively better process enthalpies owing to their active water adsorption capacities. Of the six materials tested, Zeolite-NaY has offered better results and its enthalpies range from 287.5 J g−1 to 348.5 J g−1 for the desorption and from 81 J g−1 to 292.1 J g−1 for the adsorption. A mass gain was noticed for each of the tested materials as they undergo the cooling process, thus affecting water vapor adsorption capacity negatively.

Arsenate removal from contaminated water using Fe2O3-clinoptilolite powder and granule

ABSTRACT Natural clinoptilolite (Clin) was modified with iron oxide using three different methods including precipitation, wet-impregnation and ion-exchange and then the modified adsorbent with highest As(V) removal efficiency was encapsulated into Alginate by a simple cross-linking method to obtain Fe-Clin granules. The surface morphology and chemical composition of the Fe-Clin sorbents were characterized by scanning electron microscope and X-ray diffraction analysis. The selected Fe-Clin powders and granules possessed enhanced affinity towards the highly toxic arsenic pollutant in a very short time. Batch adsorption experiments showed that the Fe-Clin adsorbent can be widely used within a wide range of pH (2-9). In addition, to reach a high removal percentage (over 90%) of As(V), the optimum dosage of powder and granule shaped adsorbents was obtained as 0.1 and 0.6 g L−1, respectively. Both adsorbents could successfully remove As(V) in a very short amount of time as 20 and 30 min in the case of powders and granules, respectively. The maximum adsorption capacity of Fe-Clin granules evaluated by using Langmuir adsorption isotherm was found to be 11.17 mg g−1. By testing the granules in a circulated fluidized column experiment, it was demonstrated that Fe-Clin granules could remove As(V) up to an acceptable level (93%) within 10 min. This study demonstrates that Fe-Clin granules, obtained by exploiting natural clinoptilolite, iron oxide and alginate, are efficient, sustainable and fairly cheap adsorbents for the removal of arsenate from the aquatic environment in a very short contact time.

Removal of heavy metals using sorbents derived from bark

The purpose of this study was to examine the sorption properties of low-cost sorbents derived from bark for heavy metals such as copper and cadmium at different pH and ionic strength conditions. Three different bark-derived sorbents such as untreated, acid treated, and alkaline treated barks were prepared. The acid treated and alkali treated barks were obtained through chemical treatments using 0.1 HCl and 0.1 NaOH solutions, respectively. Morphology, elemental composition, and specific surface area of different bark-derived sorbents were characterized by SEM (Scanning Electron Microscopy), EDS (Energy-dispersive X-ray spectroscopy) and BET (Brunauer–Emmett–Teller) specific surface area measurements, respectively. Batch isotherm tests were carried out to examine the sorption properties of bark-derived sorbents. The results showed that alkali treated bark had high affinity for both copper and cadmium. At pH 7.0 sorption capacity of alkali treated bark for copper (1.43 mg/g) was greater than untreated and acid treated barks, which corresponded to a removal efficiency of around 95%. Also, sorption capacity of alkali treated bark for cadmium was greater than the other bark-derived sorbents, which corresponded to removal efficiency of around ~ 98.5%. In case of pH effect, sorption affinity of untreated bark for both copper and cadmium increased with the increase of pH. On the other hand, for ionic strength effect, sorption affinities of three different bark-derived sorbents for copper decreased with increase of ionic strength. Therefore, the alkali treated bark could be a cost-effective sorbent for the removal of heavy metals from water and wastewater.

Use of Methods of Electronic Microscopy, Mass-Spectrometry and Roentgenospectral Electronic Probe Micro-Analyzer in Ecological and Analytical Studies. Elemental Composition of Blue Micro-Particles of Unknown Nature Observed in Suspended Substance of Lake Baikal

During the period from April till June, 2018, suspended substance of Baikal Lake water from depths up to 25 meters in various distance from the shore (up to 4,000 m) showed presence of hard particles of blue color in size up to 900 mkm of unknown nature with maximum numbers at the nearshore zone, resistant to mineral acids and combustion. The analysis using methods of electronic microscopy with spray application of conducting golden coating, field desorption with inductively connected plasma (mass-spectroscopy) roentgenospectral electronic probe micro-analyzer, along with investigation of the surfaces of the objects studied and the components distributed in them, showed a set of 68 elements entering the composition of the particles. The major composition is marked for Ti, Ca and Si. Comparatively high composition is found for high-density metals: Zn, Pb, Sb, Nb, Cu, As. Suppositions are made about the anthropogenic nature of the blue particles — in forms of products of agglomerating titanium with fuliginous phase, as well as in composition of sorbents on the basis of compounding of titanium and ship paints.

A novel sorbent based on Ti-Ca-Mg phosphates: synthesis, characterization, and sorption properties.

This work focuses on the synthesis procedure of a new sorbent based on a TiCaMg phosphate. The synthesis strategy includes stepwise interaction between solid precursors and phosphorus-containing agents. The solid precursors were ammonium titanyl sulfate and calcined dolomite, which were used as titanium, calcium, and magnesium sources. The effect of the nature and concentration of phosphoric agent on the sorbent composition and properties has been investigated using elemental analysis, TG, XRD, IR spectroscopy, BET, and SEM techniques. The novel sorbent has been demonstrated to be a composite material consisting of the following components: TiO(OH)H2PO4·H2O, Ti(HPO4)2·H2O, CaHPO4·2H2O, MgНPO4·3H2O, and NH4MgPO4·6H2O. The ratio between these phases in the composite depends on synthesis conditions. The optimal conditions, ensuring full conversion of Ti, Ca, and Mg containing in the initial precursors into the final product, have been found. The sorption properties of the obtained composite sorbent towards Co2+, Cs+, and Sr2+ cations and their radionuclide analogues have been studied. The obtained data has indicated that the purification effect was based on both precipitation and ion exchange mechanism. The combined action of the individual components of the composite sorbent ensures its high sorption capacity towards different cations in a wide pH range. The new sorbent shows high sorption ability towards radionuclides in multicomponent liquid radioactive waste (LRW) systems, and the distribution coefficient of the studied radionuclides was found to be 105mLg-1. The presence of different types of functional groups in the composite sorbent allows realizing the one-step purification process of LRW that, in turn, simplifies the sorption system design.

Adsorption of Eu(III) onto bentonite and phyllite: A comparative study

Disposal of radioactive wastes in underground repositories necessitates knowledge on adsorption and mobility of radionuclides in host rocks (geologic barrier) and in engineered barriers, including clay barrier. The batch adsorption of Eu(III) (a homologue for trivalent radionuclides) onto phyllite compared to bentonite was studied as a function of solution pH (4.5 and 7.0), solution to clay rock ratio (10:1, 100:1, 500:1 and 1000:1), and various Eu(III) concentrations (0.01–190 mg/L; 0.658 × 10−7–1.25 × 10−3 M). The experimental data were interpreted using the isotherm models of Langmuir, Freundlich, Dubinin-Radushkevich, Tóth, and Sips. Adsorption/desorption experiments and bonding strength calculations showed that the adsorption behavior depends on the mineral composition of sorbents, solution pH, the initial concentration of Eu(III), and liquid: solution ratio (L:S). The cation exchange within the interlayer space of montmorillonite is the main adsorption mechanism in bentonite. Cation exchange on the minerals surface, chemical reactions leading to the precipitation of new phases, the electrostatic effect at a low initial concentration of Eu (III), and pH > pHPZC are adsorption mechanisms in phyllites. Solution pH has a pronounced effect on the Eu(III) adsorption onto phyllite due to surface protonation. Fe-oxides and hydroxides play a significant role in the adsorption/desorption of Eu(III) on phyllites. The best fitting was obtained for three-parameter isotherm models of Sips and Tóth. The mechanism of Eu(III) binding is complex and does not follow the ideal monolayer adsorption. While the maximum adsorption capacity of phyllite is 2.5 to 6.6 times lower than of bentonite, depending on the solution pH, it is high enough to guarantee efficacious and durable removal of actinides from the contaminated solutions, particularly at their low concentrations. Phyllites adsorption and mechanical properties make them suitable additives to bentonite in a clay barrier.

Fast removal of Pb(II) and Cu(II) from contaminated water by groundwater treatment waste: impact of sorbent composition

ABSTRACT A non-hazardous groundwater treatment waste (GWTW) was examined as a low-cost sorbent for Pb(II) and Cu(II) ions. The content of the dominant elements in GWTW was as follows: 78% Fe2O3, 7.4% P2O5, 7.4% CaO and 5.2% SiO2. The removal of Pb(II) and Cu(II) was fast, and more than 67–95% of ions were accumulated by GWTW during the first 3 min. The sorption capacity of GWTW depends on solution pH, concentration and temperature. Equilibrium data fitted well with Langmuir–Freundlich and Langmuir-partition models. The inherently formed nano-adsorbent could be utilized for the treatment of water contaminated with Pb(II) and Cu(II) ions.

Effect of oxidative treatment on composition and properties of sorbents prepared from sugarcane residues

Efficient sorbents for the removal of cationic dye were prepared from sugarcane bagasse (stalk) and straw (leaves) by oxidative pre-treatment with hydrogen peroxide (H2O2) in acetic acid. The effects of variables, such as concentration of H2O2, temperature and time on the properties of the fiber sorbents obtained were studied according to a 23 full-factorial design. For comparison, an oxidative treatment of sugarcane biomass with glacial acetic acid was also used. The yields of the materials obtained and their chemical composition were characterized and compared. Fourier transform infrared spectroscopy, field-emission scanning electron microscopy and benzene vapor adsorption were used to investigate the structural properties and morphology of the initial materials and sorbents. The sorption of methylene blue dye was used to assess the efficiency of dye removal by the sorbents. The pre-treatment conditions significantly affected the sorbent yield, their chemical composition (contents of cellulose, lignin and ash) as well as their sorption properties. The cellulosic sorbent (C-sorbent) from sugarcane bagasse obtained by pre-treatment with H2O2 in acetic acid and the lignocellulosic sorbent (LC-sorbent) from sugarcane straw obtained by pre-treatment with glacial acetic acid, had the highest sorption capacity for the methylene blue dye. For both types of sorbents, the sorption capacity increased with chemical pretreatment as a result of an increase in pore volume.

Comparative analysis of sorptive, textural, strength properties and chemical composition of commercial medical CO2 sorbents

Physicochemical properties of commercial medical CO2 sorbents Amsorb Plus, Draeger 800, Draeger free, Loflosorb, Sodasorb, Sofnolime, Spherasorb, Ventisorb, as well as of the Russian adsorbent HPI were studied to determine the chemical compositions, textural characteristics, effective protection time with respect to CO2; crushing and attrition resistance of granular sorbents were measured using the SHELL SMS-1471 and ASTM D 4058 96 procedures. The best performance (a high CO2 capacitance, strength) was observed with Draeger 800. The obtained data on operating properties of commercial sorbents and recommendations can be useful for medicine, rescue works, as well as for scientific and production activities when cleaning air mixtures from carbon dioxide is necessary.

Oxidative Degradation of Tetraethylenepentamine-Impregnated Silica Sorbents for CO2 Capture

The stability of silica impregnated with commercial tetraethylenepentamine (TEPA) under accelerated oxidizing conditions was evaluated, and the changes in the composition of sorbents during oxidati...

Фазовый и гранулометрический состав, структурно-морфологические и текстурные характеристики композиционного сорбента

В работе представлены результаты исследований фазового и гранулометрического состава, морфологических и текстурных характеристик композиционного сорбента на основе бентонитоподобной глины и гидроксилапатита, синтезированного методом химического осаждения. Методами рентгенофазового анализа, ИК-спектроскопии и сканирующей электронной микроскопии зафиксировано образование кристаллов гидроксилапатита в композиционном сорбенте, которые расположены на поверхности частиц минералов, слагающих бентонитоподобную глину. Методом лазерной дифракции определено, что в композиционном сорбенте преобладают частицы размером от 1.0 до 10 мкм. Их содержание достигает 74.76 масс.%. Методом просвечивающей электронной микроскопии установлено, что кристаллы монтмориллонита имеют вид пленок размером 100 – 300 нм, гидроксилапатита – удлиненную форму длиною от 35 до 65 нм и шириною от 12 до 20 нм, размер кристаллов гидроксилапатита в композиционном сорбенте от 8 до 18 нм и от 5 до 8 нм соответственно. Величина удельной поверхности композиционного сорбента, определенная с помощью анализатора TriStar II 3020, равна 96.81 м2/г и больше на 85.78% и 12.85% по сравнению с бентонитоподобной глиной и гидроксилапатитом соответственно.

Ecologically friendly ways to clean up oil spills in harbor water areas: crude oil and diesel sorption behavior of natural sorbents.

This work aimed to evaluate the sorption capacity of natural sorbents (wool, moss, straw, peat) and their composites during the sorption of crude oil and of diesel overspread on the water surface. The work presents the research results of the maximum sorption capacity of the sorbents/their composites using crude oil/diesel; the sorption capacity of the sorbents/their composites when crude oil/diesel is spilled on the water surface; and the research results of the unrealized part of the crude oil/diesel in the sorbents. The results of the analysis showed that all the sorbents and their composites have their selectivity to crude oil less than 50%. Also the results showed that the distribution of diesel and water in the sorbents and their composites is very different compared with the distribution of crude oil during the sorption analyses. In total, the diesel in the liquid mass absorbed by the straw and the peat amounted to 17 and 20%, respectively. This shows that these sorbents are much more selective for water but not for diesel. A larger part of the diesel was in the liquid amount absorbed by the composites-up to 33%. Accordingly, the use of these composites in watery environments is much more effective than the use of individual sorbents. The composition of sorbents in the composite enhanced both the hydrophobic and the oleophilic properties; as a result, a more effective removal of the diesel and oil from the water surface was achieved.

Effect of the Compositions of Sample and Polymer Sorbents on the Extraction of Volatile Compounds by Solid-Phase Microextraction

A comparative study was performed by solid phase microextraction and capillary gas chromatography to establish the ability of four polymer sorbents of different compositions to extract and concentrate volatile organic compounds from the gas phase above an aqueous solution. All polymer sorbents sorbed nonpolar monoterpene hydrocarbons via a cooperative mechanism with almost equal and high efficiency. Sorbents based on polymethyl disiloxane and its mixture with divinylbenzene were more effective in extracting acetates and sesquiterpenes. As the concentration of these compounds in the gas phase increased, their binding by sorbents decreased. It was found that the determination of polar compounds depended on the presence of a solvent in the system. Compounds that are highly soluble in water (alcohols, ketones, etc.) had low coefficients of distribution between gas and water phases. Consequently, their sorption to any of the polymer sorbents was negligible. In the absence of the solvent, the degree of their extraction from the gas phase above the sample was high. It was shown that the actual composition of compounds in the initial mixture of essential oils could significantly differ from their composition in the gas phase. This method is convenient and informative for the purpose of studying the composition of volatile compounds in the gas phase that determine the flavor of the product.

Optimization of Parameters for the Generation of Hydrogen in Combined Slow Pyrolysis and Steam Gasification of Biomass

The generation of hydrogen in steam gasification can be improved by combining slow pyrolysis and steam gasification. The study investigates the effect of controlling parameters of slow pyrolysis–steam gasification on the generation of hydrogen. In the work, some native biomass wastes were first slow pyrolyzed, and then the generated chars were steam gasified to generate hydrogen. In slow pyrolysis, factors such as temperature, solid residence time, and particle size were optimized. In steam gasification, variables such as gasification temperature, residence time, steam-to-biomass ratio, catalysts, composition of catalysts, sorbents, composition of sorbents, and effective catalyst–sorbent composition were optimized. Through slow pyrolysis, it was ensured that only high-quality char was available to steam gasification. It was found that the highest gasification temperature yielded the maximum amount of hydrogen. It was noticed that an optimal residence time and steam-to-biomass ratio was essential to genera...

Development and evaluation of microwave-assisted and ultrasound-assisted methods based on a quick, easy, cheap, effective, rugged, and safe sample preparation approach for the determination of bisphenol analogues in serum and sediments.

Microwave- and ultrasound-assisted methods based on a quick, easy, cheap, effective, rugged, and safe sample preparation approach followed by high-performance liquid chromatography with tandem mass spectrometry were developed for the simultaneous determination of eight bisphenol analogues in serum and sediment. The developed methods provided satisfactory extraction efficiency for the energy provided by microwaves and ultrasound. Compositions of commercial sorbents (primary secondary amine, MgSO4 , octadecyl-modified silica, and graphitized carbon black) were evaluated. The ultrasound-assisted method was suited for serum using primary secondary amine, MgSO4 , and octadecyl-modified silica as sorbents and a mixture of hexane and ethyl acetate as extraction solvent. The microwave-assisted method worked better for sediment with tetrahydrofuran and methanol as solvents and primary secondary amine, MgSO4 , octadecyl-modified silica, and graphitized carbon black as sorbents. Other experimental parameters, such as extraction temperature and time, were also optimized. The inter- and intraday relative standard deviations ranged from 2.7 to 5.5%. The limits of detection were between 0.1 and 1.0ng/mL for serum and between 0.1 and 0.5ng/g dry weight for sediment. The proposed methods were successfully applied to seven sediment and 20 human serum samples. The results showed that the developed methods were practical for the analysis and biomonitoring of bisphenols in sera and sediment.

Catalytic steam methane reforming enhanced by CO2 capture on CaO based bi-functional compounds

Sorption enhanced steam methane reforming (SE-SMR) was performed to maximize hydrogen production and contemporary remove CO2 from the product stream using bi-functional sorbent-catalyst compounds. Samples were tested at two different scales: micro and laboratory. The CaO amount varied in the CaO–Ca12Al14O33 sorbent system synthesized by wet mixing (CaO content of 100 wt%, 56 wt%, 30 wt%, or 0 wt% and balance of Ca12Al14O33) which were upgraded to bi-functional compounds by impregnation of 3 wt% of Ni. Nitrogen adsorption (BET/BJH), X-Ray Diffraction (XRD), Temperature-Programmed Reduction (TPR) and Scanning and Transmission Electronic Microscopy (SEM and TEM, respectively) analyses were performed to characterize structural and textural properties and reducibility of the bi-functional materials and evaluate their catalytic behavior. A fixed sorbent composition CaO–Ca12Al14O33 (56 wt% of CaO and Ca12Al14O33 balance), was chosen to study the effect of different weight hourly space times (WHST) and CH4 stream compositions in SE-SMR activity. Impregnated mayenite at both micro and laboratory scales showed stable H2 content of almost 74%, with CH4 conversion of 72% similarly to the values reported by the sample containing 30 wt% of CaO in the post-breakthrough.Sample with 30 wt% of CaO showed promisingly behavior, enhancing H2 content up to almost 94.5%. When the sorption enhanced reaction is performed roughly 89% of CH4 conversion is achieved, and after the pre-breakthrough, the catalyst worked at the thermodynamic level. During cycling sorption/regeneration experiments, even if CO2 removal efficiency slightly decreases, CH4 conversion and H2 yield remain stable.

GENTLE ACTIVATION OF POLYMINERAL SORBENT AND ITS INFLUENCE ON CLEANING PROCESS OF OIL-CONTAINING MEDIA FROM IMPURITY INGREDIENTS

An attempt to evaluate the effect of gentle activation of the surface of polymineral sorbent – blue clay with oxalic acid (Kdis = 5.6∙10-2) and sodium carbonate was carried out. The chemical structure of the initial and activated materials was established by the X-ray phase analysis. The prospect of their use for the sorption extraction of impurity ingredients from oil-containing media was revealed. An important rock-forming mineral in a composition of polymineral sorbent is montmorillonite. It was found that 45 mass% of the powder material has a particle size of 0.3-2.5 μm (quartz, cristoballite), 21% of the particles have a size of 5-10 μm and a small part (≤ 9%) is more than 10 μm. As a result of gentle activation of the sorbent with a 6% solution of oxalic acid, a clearer crystallized surface forms on which the effect of increasing the total pore size (100 nm - 2 μm) is observed. Such activated material is the meso- (20-500 Ǻ) type and macroporous type (> 500 Ǻ). The atomic composition of the renewed surface indicates the partial destruction of kaolinite during acid activation with an additional effect on impurity hydromica and a balancing increase in the mass fraction of quartz and saponite fractions (scaly particle form, 1-3 μm). The data of IR spectroscopic studies confirm the consistency of the judgments. Sequential activation with a solution of alkaline earth metals and sodium carbonate ensures the formation of tortuous pores and the production of disparate and relatively shallow (no more than 5 μm) particles in comparison with the original (globules up to 50 μm are encountered). The observed texture is a loosened land material of a complex chemical composition with the inclusion of natural grains of quartz, crystals (montmorillonite), fibrous structures and individual flakes. When 1% by weight of a polymineral sorbent based on montmorillonite and SiO2 was introduced into linseed oil, it was found that its treatment with 6% solutions of oxalic and succinic acid promotes an increase in the degree of purification from fatty acids to 40% and from peroxide compounds to 40%, then as gentle acid-alkaline activation of the sorbent provides the production of an oil-containing product with an even lower (by 5%) concentration of fatty acids.Forcitation:Nagornov R.S., Razgovorov P.B., Lepilova A.M., Stroganova Yu.I., Smirnov P.R., Kochetkov S.P. Gentle activation of polymineral sorbent and its influence on cleaning process of oil-containing media from impurity ingredients. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 8. P. 53-59.

Effect of pre-calcination for modified CaO-based sorbents on multiple carbonation/calcination cycles

Abstract In the present work, the effect of pre-calcination on carbonation conversion and cyclic stability of modified CaO-based sorbent was investigated by thermogravimetric analyzer (TGA). The modified CaO-based sorbents with CaAc 2 as precursor were respectively doped with different elements (Mg, Al, Ce, Zr and La). The specific surface area, pore volume and pore size distribution were tested by N 2 isothermal adsorption measurements. The phase compositions of sorbents were characterized by X-ray diffraction (XRD). The results showed that the cyclic stabilities of the sorbents were improved by pre-calcination. The pre-calcination was conducted at 900 °C for 5 h in air by the muffle furnace. With pre-calcination, the cyclic stabilities of sorbents could be as high as 96% after 22 cycles, such as CaO-Al, CaO-Ce and CaO-La. After contact with air, the carbonation conversions of spent sorbents with pre-calcination suddenly increased by about one-sixth due to the change of channel structure by hydration. Both the cyclic stability of sorbent and the durability of reactivation were related to the structural stability of sample, especially the stability of mesopores between 2 nm and 5.5 nm. The present work also provided an easy and low-cost method for reactivating the spent CaO-based sorbents.

Energy Integration of High and Low Temperature Solid Sorbents for CO2 Capture

It is crucial to reduce the energy penalties related to CO2 capture processes if CCS is to be implemented at industrial scale. In this context, gas-solid sorption has become a relevant technology. The absence of large amounts of water when using dry solid sorbents and their high heat capacity reduce the energy requirements in the gas-solid sorption CO2 capture process. Depending on the sorbent composition, the gas-solid sorption process carries out at high or low temperatures. High temperature sorbents allow the utilization of waste energy while energy requirements in low temperature processes will be less demanding. This study is focused on the assessment and comparison of the final energy penalty of low-temperature (amine impregnated alumina-based solid particles) and high-temperature solid sorbents capture process (calcium oxide).

Антибактериальная активность гранулированных углеродных сорбентов

Цель исследования - изучение антибактериальной активности гранулированных углеродных сорбентов по отношению к патогенной микрофлоре в условиях различной продолжительности контакта с сорбентом. Методика. Исследовали антибактериальные свойства гранулированного сорбента ВНИИТУ-1, обработанного гидромеханически, окисленного и стабилизированного до нормативных значений рН и модифицированного поли-N-винилпирролидоном (ПВП) ВНИИТУ-1 по отношению к патогенным микроорганизмам: Staphylococcus aureus, Pseudomonas aeroginosa, Klebsiella pneumonia, Escherichia coli, Streptococcus agalactiae, а также к их смесям. Все микроорганизмы представляли собой клинические штаммы, выделенные из ран пациентов. Предварительно тест-микроорганизмы были исследованы на чувствительность к современным антибиотикам. Опытным путем подбирали такие разведения и количество засеваемого материала, чтобы выросшие на чашке Петри колонии можно было сосчитать. Бактерии сорбировали из физиологического раствора с концентрацией микробных клеток 3 х 10 колониеобразующих единиц в 1 мл исследуемой пробы (КОЕ/мл). В пробирку типа Эппендорф вносили сорбент в количестве 0,5 мл, добавляли 1 мл микробной взвеси, встряхивали для удаления пузырьков воздуха и выдерживали в термостате в течение 1, 3, 6 и 24 ч. По истечении заданного времени контакта сорбента с патогенной микрофлорой отбирали надосадочную жидкость в объеме 100 мкл, засевали на стерильные агаровые пластины чашек Петри с питательной средой ГМФ-агар. Засеянные чашки Петри помещали в СО-инкубатор 15АС (Япония) вверх дном и инкубировали при температуре 37 ± 1°С в течение 24 ± 2 ч. При подсчете колоний, выросших на чашке Петри, учитывали только те чашки, на которых выросло более 300 изолированных колоний. Результаты. Гранулированный сорбент ВНИИТУ-1 обладает антибактериальным действием в отношении как грамположительных, так и грамотрицательных бактерий, а также их смеси. Сроки проявления антибактериального эффекта сорбента зависят от вида микроорганизмов и времени их контакта с образцом. Присутствие в составе сорбента модификатора ПВП усиливает его антибактериальные свойства. Полимермодифицированный образец обладает пролонгированным антибактериальным эффектом в отношении широкого спектра микроорганизмов (E. coli, St. aureus, P. aeruginosae и St. aureus) и смеси их культур. Заключение. Показана возможность повышения антибактериальных свойств гранулированных углеродных сорбентов по отношению к патогенной микрофлоре путем их модификации поли-N-винилпирролидоном. Дальнейшая разработка и применение углеродных сорбентов как средств сорбционной терапии является перспективным подходом к местному лечению гнойных ран. The purpose: Study the antibacterial activity of granulated carbon sorbents in relation to the pathogenic microflora under the conditions of different period of contact with sorbent. Methods. It has been investigated the antibacterial properties of VNIITU-1 granulated sorbent, which was hydromechanically treated, oxidized and stabilized up to pH standard parameters and VNIITU-1 modified poly-N-vinylpyrrolidone (PVP) against the pathogenic micro-organisms, including Staphylococcus aureus, Pseudomonas aeroginosa, Klebsiella pneumonia, Escherichia coli, Streptococcus agalactiae, and their mixes. All bacteria were clinical strains derived from the wounds of patients. Dilutions and amount of inoculated material were experimentally selected for further calculation of the grown colonies on the Petri dish. Bacteria were sorbed from the saline solution with bacteria concentration of 3 х 10 of the colony forming units in 1 ml of test sample (CFU/ ml). Eppendorf tube was added the sorbent 0.5 ml and bacterial suspension 1 ml; then the tube was shaken to remove the air bubbles and incubated for 1, 3, 6 and 24 hr. Upon the expiry of the target time for sorbent with pathogenic flora contact the supernatant fluid was collected in 100 ul and inoculated on the sterile agar plates of the Petri dishes with GMF agar nutrient medium. Inoculated Petri dishes were placed upside down in СО incubator 15AC (Japan) and incubated at 37 ± 1°C for 24 ± 2 hours. When counting the colonies growing on the Petri dish, they took into consideration only the dishes where more than 300 isolated colonies were grown. If more than 300 colonies were grown, «> 3x102 CFU/ml» was recorded in the protocol. Results. Granulated sorbent VNIITU-1 has an antibacterial effect against both gram-positive and gram-negative bacteria, and their mixes. Time period for manifestations of the sorbent antibacterial effect depends on the type of microorganisms and time of contact. PVP presence in sorbent composition enhances the antibacterial effect of the sorbent. Resin-modified sample has a prolonged antibacterial effect against a broad spectrum of microorganisms (E. coli, St. aureus, P. aeruginosae and St. aureus) and mixtures of their cultures. Conclusion. It has been determined the possibility for increasing of antibacterial properties of granulated carbon sorbents against the pathogenic microflora by their modification with poly-N-vinylpyrrolidone. Further development and application of carbon sorbents as the means for sorption therapy is a perspective approach for the local treatment of purulent wounds.