排序方式: 共有18条查询结果,搜索用时 203 毫秒
1.
S. S. Stavitskaya N. T. Kartel’ N. N. Tsyba M. F. Kovtun T. P. Petrenko 《Russian Journal of Applied Chemistry》2007,80(3):379-385
The mineral and chemical compositions, as well as some structure-sorption characteristics were determined for clay minerals selected for examination. The integrated coefficients of contamination of bottom sediments with each of the toxicant metals (Fe, Ni, Co, Cu, Zn, Pb, Mn) were calculated. The minerals examined presumably can be used in medicine as efficient application materials, cosmetic agents, and sorbents (enterosorbents). 相似文献
2.
Stavitskaya S. S. Tomashevskaya A. N. Goba V. E. Kartel’ N. T. Strelko V. V. 《Russian Journal of Applied Chemistry》2004,77(9):1450-1454
The performance of various carbon materials in sorption capture of chlorine from waste gases yielded by electrolysis of nickel-manganese solutions was studied. A simple method was proposed for regeneration of carbons after sorption of chlorine, which makes them suitable for repeated use in sorption installations for chlorine capture.Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 9, 2004, pp. 1462–1466.Original Russian Text Copyright © 2004 by Stavitskaya, Tomashevskaya, Goba, Kartel, Strelko. 相似文献
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S. S. Stavitskaya V. M. Vikarchuk N. N. Tsyba N. T. Kartel’ O. N. Bakalinskaya 《Russian Journal of Applied Chemistry》2007,80(1):48-52
The sorption of organic dyes of various molecular weights (from 100 to 700 amu) from aqueous solutions on minerals and on sea and lake bottom sediments was studied. 相似文献
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Stephen MT Hoke Gaoyang Liang A Irina Mutiu Julie Genereaux Christopher J Brandl 《BMC biochemistry》2007,8(1):16
Background
Spt7 is an integral component of the multi-subunit SAGA complex that is required for the expression of ~10% of yeast genes. Two forms of Spt7 have been identified, the second of which is truncated at its C-terminus and found in the SAGA-like (SLIK) complex. 相似文献5.
Adsorption of anionic and cationic dyes by activated carbons, PVA hydrogels, and PVA/AC composite 总被引:1,自引:0,他引:1
Sandeman SR Gun'ko VM Bakalinska OM Howell CA Zheng Y Kartel MT Phillips GJ Mikhalovsky SV 《Journal of colloid and interface science》2011,358(2):582-592
The textural and adsorption characteristics of a series of activated carbons (ACs), porous poly(vinyl alcohol) (PVA) gels, and PVA/AC composites were studied using scanning electron microscopy, mercury porosimetry, adsorption of nitrogen (at 77.4 K), cationic methylene blue (MB), anionic methyl orange (MO), and Congo red (CR) from the aqueous solutions. Dye-PVA-AC-water interactions were modeled using the semiempirical quantum chemical method PM6. The percentage of dye removed (C(rem)) by the ACs was close to 100% at an equilibrium concentration (C(eq)) of less than 0.1 mM but decreased with increasing dye concentration. This decrease was stronger at C(eq) of less than 1 mM, and C(rem) was less than 50% at a C(eq) of 10-20 mM. For PVA and the PVA/AC composite containing C-7, the C(rem) values were minimal (<75%). The free energy distribution functions (f(ΔG)) for dye adsorption include one to three peaks in the -ΔG range of 1-60 kJ/mol, depending on the dye concentration range used and the spatial, charge symmetry of the hydrated dye ions and the structural characteristics of the adsorbents. The f(ΔG) shape is most complex for MO with the most asymmetrical geometry and charge distribution and adsorbed at concentrations over a large C(eq) range. For symmetrical CR ions, adsorbed over a narrow C(eq) range, the f(ΔG) plot includes mainly one narrow peak. MB has a minimal molecular size at a planar geometry (especially important for effective adsorption in slit-shaped pores) which explains its greater adsorptive capacity over that of MO or CR. Dye adsorption was greatest for ACs with the largest surface area but as molecular size increases adsorption depends to a greater extent on the pore size distribution in addition to total and nanopore surface areas and pore volume. 相似文献
6.
The industrial porous co-polymers and resins in the form of spherical granules include three main matrices which serve as
the basis of the large-scale production of ion-exchange materials: styrene/divinylbenzene, vinylpyridine/divinylbenzene and
acrylonitrile/divinylbenzene. Complex thermal methods (TG, DTG and DTA) were used to study the carbonization processes of
various industrial products utilized as starting materials for the preparation of synthetic active carbons. The DTG results,
the thermal effects observed during the programmed heating of samples, and the mass-spectrometric and IR-spectroscopic data
up to 800°C provided a picture of a multi-stage carbonization process. This includes the removal of moisture from the polymer
matrices, the primary cross-linking of the chains, their aromatization and condensation due to the cross-linking of polynuclear
structures, and the removal of ‘excess carbon’ as simple molecules and free radicals of hydrocarbon type. The results promoted
the choice of the optimal regimes in which to carryout the isothermal pyrolysis of various polymer matrices and preliminary
chemical modifications to increase the yields on carbon and to prepare synthetic active carbons such as those of SCN, SCAN
and SCS types. General schemes were proposed for the chemical reactions accompanying the carbonization process for these polymer
matrices.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
7.
L. A. Kupchik N. T. Kartel’ E. S. Bogdanov O. V. Bogdanova M. P. Kupchik 《Russian Journal of Applied Chemistry》2006,79(3):457-460
The sorption properties of natural polysaccharide (apple pectin) with respect to heavy metals in a Ringer salt solution were studied as influenced by the procedures and process parameters of its chemical modification. 相似文献
8.
Sergey V. ZhuravskyMykola T. Kartel Yuriy O. TarasenkoSilvia Villar-Rodil Gábor DobosAjna Tóth Juan M.D. TascónKrisztina László 《Applied Surface Science》2012,258(7):2410-2415
N-containing synthetic carbons with narrow porosity were prepared from a chlorinated styrene and divinylbenzene copolymer by a multistep method with a yield of 34 wt%. Surface chemical treatment and thermal carbonization of the starting copolymer was monitored by urea impregnation. Steam activation, oxidation and an additional heat treatment gave the final product. The synthesis route was designed in a cost-effective way. The porosity and the concentration of the introduced nitrogen atoms were determined at each step. The final product has a surface area of 1135 m2/g. More than 70% of the pore volume comes from micropores with an average width of 0.7 nm. The 2.3 at.% surface nitrogen atoms are distributed among five detectable species, of which about 44% is quaternary nitrogen. 相似文献
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