Water purification of dyes by ceramic membranes modified by pyrocarbon of carbonized polyisocyanate

Гончарук, В. В.; Dubrovina, L. V.; Kucheruk, D. D.; Samsoni-Todorov, A. O.; Оgenko, V. M.; Dubrovin, I. V.

doi:10.3103/s1063455x16010069

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…The modification with GO is expected to be efficient for modifying of other inorganic cationexchangers, which could be easy regenerated with acids without destruction. At last, the composite can be proposed for modification of membranes similarly to HZD [41,42,51] or carbon materials [64,65].…”

Section: Discussionmentioning

confidence: 99%

Composite on the basis of hydrated zirconium dioxide and graphene oxide for removal of organic and inorganic components from water

Dzyazko¹,

Ogenko²,

Volfkovich³

et al. 2018

Him. Fiz. Tehnol. Poverhni

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The aim of the investigation is to develop multifunctional adsorbent, which is able to remove both inorganic ions and molecular organic substances from aqueous solutions. Oxidized graphene has been obtained by Hammer's method. The composite, which includes hydrated zirconium dioxide and graphene oxide ( 2 mass. %), has been synthesized by deposition from sol containing dispersed particles of the carbon material. The adsorbent as well as its constituents were investigated with methods of XRD analysis, FTIR spectroscopy, TEM and standard contact porosimetry involving octane (ideally wetting liquids) and water as working liquids. Strong hydration of graphene oxide in water has been found: the volume of micro-and mesopores in water medium is higher than that in octane. It means that the oxidized graphene behaves similarly to ion exchange polymers. This is evidently due to its hydrophilic functional groups (hydroxyle carboxyl and epoxy groups). High specific surface area of graphene oxide reaches 1200 (in the organic solvent) or 2250 m 2 g-1 (in aqueous medium). It has been shown that graphene covers the particles of the inorganic matrix loosening its structure within the wide interval of pore size (from 10 nm to 1.5 µm). As found, adsorption isotherms of Pb(II) and HCrO 4 ions obeys with Langmuir model. The filler improves adsorption of Pb(II) ions increasing the capacity in 1.7 times due to its expressed cation exchange properties. Contrary, anion exchange function of the composite is depressed, since the sheets of graphene oxide screen adsorption centers of the inorganic matrix. Other reason can be electrostatic repulsion of anions due to the shift of the point of zero charge of the composite to acidic field. By reason of the carbon filler, the oxide material acquires the capability to adsorb both slightly dissociated (phenol) and molecular (lactose) organic substances. When the initial content of phenol is 5 mg dm-3 , it is possible to reduce its content in water down to maximal permeable concentration. After adsorption, the content of lactose is much lower than this parameter. It means, that the composite provides practically complete removal of organics from water.

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Section: Discussionmentioning

confidence: 99%

Composite on the basis of hydrated zirconium dioxide and graphene oxide for removal of organic and inorganic components from water

Dzyazko¹,

Ogenko²,

Volfkovich³

et al. 2018

Him. Fiz. Tehnol. Poverhni

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“…The HZD-GO-2 composite can be recommended as a multifunctional adsorbent to remove inorganic ions (both toxic species and hardness ions) and toxic organic compounds. Other possible field of adsorbent application is modifying of polymer and ceramic materials for baro-or electromembrane separation similarly to [44][45][46][47]72].…”

Section: Discussionmentioning

confidence: 99%

Composite adsorbents including oxidized graphene: effect of composition on mechanical durability and adsorption of pesticides

Dzyazko¹,

Ogenko²,

Shteinberg³

et al. 2019

Him. Fiz. Tehnol. Poverhni

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A number of multifunctional composite adsorbents based on hydrated zirconium dioxide has been synthesized. The inorganic ion exchanger contained nanosheets of oxidized graphene (GO), the modifier amount was 0.5-7 mass. %. The composites were investigated with methods of transmission electron microscopy and nitrogen adsorption-desorption, macropores were determined using water as a working liquid. It has been found that increasing of GO content depresses microporosity, but meso-and macroporosity grow. Crushing strength reduces exponentially with increase of total pore volume from 0.49 to 0.62 cm 3 g -1 . Removal of phenol from water containing also inorganic ions was investigated. Adsorption capacity reaches 0.15-0.85 (phenol), 0.5-0.85 (Ca 2+ and Mg 2+ ), 0.005-0.045 (SO 4 2-) mmol g -1 . When the GO content in the composites is 0.5-2 %, this carbon addition improves adsorption of cations and organic molecules comparing with hydrated zirconium dioxide. Further increase in GO amount causes no sufficient effect on adsorption due to decline of specific surface area of the composites. It has been suggested that the optimal content of the modifier, which provides the maximal growth of adsorption capacity, is 2 %. This composite is obtained in a form of large granules (0.3-0.5 mm), their crushing strength is 9 bar. The material was applied to removal of pesticides (acetomipride, carboxine, epoxyconazole and thiamethoxam) from aqueous multicomponent solution under batch conditions. The residual content of carboxine and epoxyconazole, molecules of which contain benzene rings, is lower than the maximal allowable concentration. No deterioration of pesticide uptake has been found after five cycles of adsorption-regeneration.

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“…Углерод образуется на поверхности и в объеме пор мембраны [6,7]. В работах [8,9] нами было проведено пироуглеродное модифицирование микрофильтрационных керамических мембран с размером пор 0.6-0.7 мкм, в результате которого получены мембраны с ультрафильтрационными свойствами. Углерод является химически и термически стойким неорганическим материалом, поэтому физикохимические свойства модифицированных мембран не изменились [10].…”

Section: Introductionunclassified

Modification of Tubular Ceramic Membranes With Pyrocarbon and Silica

et al. 2019

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The tubular ceramic membranes of clay minerals were modified with silica and pyrocarbon, which was obtained by carbonizing of polymer precursors at 750 ° С in an argon flow. The precursors to carbonation were polymers formed from the polyisocyanate and sodium carboxymethylcellulose (membrane II) and polyisocyanate and sucrose (membrane III). Silicon dioxide was formed at high temperature from liquid glass. As a result of the modification, the membranes became black with a metallic luster. The composition and structure of the membranes were studied by XRF and SEM. The modifier of the membranes is located in the pore space in the form of separate particles and sintered agglomerates. The particle size of the modified membrane filler varies from 30 nm to ~ 1 μm depending on the modifier composition. The apparent density and open porosity for the unmodified membrane are 1.80 g/cm3 and 21.9 %, for membrane II - 1.83 g/cm3 and 19.7 %, for membrane III - 1.82 g/cm3 and 18.9 %. Testing of modified membranes was carried out by water purification from Ca2+ and Fe3+ using the baromembrane method at a working pressure of 0.6 MPa. The concentration of Ca2+ in aqueous solutions of CaCl2 was 100 mg/dm3, the concentration of Fe3+ in aqueous solutions of FeCl3 was 100 and 36 mg/dm3. The period of time until the establishment of dynamic equilibrium in systems during water purification is 4 hours. The unmodified membranes does not inhibit Ca2+ and Fe3+ at all. After reaching equilibrium the retention factor (R) of Ca2+ during water purification with modified membranes pressure vary from 20 to 28 % and the specific productivity – from 22 to 40 dm3/(m2×h). The retention coefficient of Fe3+, depending on the membranes modifier and concentration of the FeCl3 solutions being purified, is 78 - 99.9 %. The specific productivity in this case is 15 - 52.3 dm3/(m2×h).

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Water purification of dyes by ceramic membranes modified by pyrocarbon of carbonized polyisocyanate

Cited by 7 publications

References 4 publications

Composite on the basis of hydrated zirconium dioxide and graphene oxide for removal of organic and inorganic components from water

Composite on the basis of hydrated zirconium dioxide and graphene oxide for removal of organic and inorganic components from water

Composite adsorbents including oxidized graphene: effect of composition on mechanical durability and adsorption of pesticides

Modification of Tubular Ceramic Membranes With Pyrocarbon and Silica

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