CPPP 2 P Sorption of heavy metals ions with fullerene-containing polystyrene films
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BAGROVSKAYA, N., ALEKSEEVA, O., NOSKOV, A.. CPPP 2 P Sorption of heavy metals ions with fullerene-containing polystyrene films. In: Materials Science and Condensed Matter Physics, 13-17 septembrie 2010, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2010, Editia 5, p. 132.
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Materials Science and Condensed Matter Physics
Editia 5, 2010
Conferința "Materials Science and Condensed Matter Physics"
Chișinău, Moldova, 13-17 septembrie 2010

CPPP 2 P Sorption of heavy metals ions with fullerene-containing polystyrene films


Pag. 132-132

Bagrovskaya N., Alekseeva O., Noskov A.
 
G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences
 
 
Disponibil în IBN: 16 aprilie 2021


Rezumat

One of perspective methods for modification of a polymeric materials surface is incorporation of nanocarbonic particles into a polymeric matrix. The produced composites get novel physical and chemical properties, that considerably expands the areas of their application as sorbents, dividing membranes, sensors, antimicrobic means. Polystyrene (PS) is of interest for functionalisation by fullerene as is raw material for industrial production of cationite. Development of sorbents on the basis of the polystyrene modified by carbon nanoclusters will allow to expand an assortment of sorbents essentially. The object of this study was to produce the fullerene-containing polystyrene films and to investigate a sorption of heavy metals ions with composites produced. Atactic polystyrene (“Aldrich”, US; molecular mass is 220000, polydispersity is 1.64) and fullerenes C60 (OOO ”Fullerene Technologies”, Russia) containing 99.5 % of the basic substance were used. The film was prepared by pouring a solution in o-xylene containing polystyrene and fullerene followed by the evaporation of o-xylene. Unmodified polystyrene film was made by the solvent cast method as well. Thickness of a film is 70 microns. Concentration of C60 in film was changed in range 0.01-0.1 % (wt.). The sorption kinetics of Cu(II), Ni(II), Zn(II), Cd(II) ions was studied in metal-sulfate solutions at static conditions. Temperature was 293 K. The sorptivity of polymers (A, mol/g) was estimated as А=(С0Ср)V/m, where С0, Сeq – initial and equilibrium concentration of metal ions in the solution (mol/l); V – solution volume, l; m – sorbent weight, g. The relative errors of estimating A value did not exceed 7%. Based on the analysis of the results of kinetic studies we can state that the time necessary to reach the sorption equilibrium (τ) are 120 min for unmodified sorbent but 20 min for composite. A limiting stage of process is diffusion within polymer. It is shown that a sorption isotherm of Cu(II) ions by PS describes as Langmuir’s equation for monomolecular adsorption. Dependence “sorption of Сu (II) ions vs concentration” has S-form for the sorbent modified. It testifies to the polymolecular mechanism of sorption. In this case a concentration of the saturated monomolecular layer has been certain by BET’s equation.TableImprovement of the sorption and kinetic characteristics of modified sorbent in comparison with similar data for unmodified PS (table) it is possible to explain to that as a result of updating polymer by fullerene there is an increase in its specific surface (S) and number of sorption centers. Selective sorptivity of films in relation to ions of metals is characterized by series: Cu(II)>Ni(II)>Cd(II)>Zn(II). A dependence “amount of the absorbed metal vs fullerene content in a film” is discovered. It is revealed, that an absorbing ability of a sorbent reaches saturation at 0,03 % (wt.) fullerene in a film. An absorbing ability of a sorbent keeps sensibly constant at the subsequent increase in a nanoparticles concentration up to 0.1 % (wt.) in a composite. The work was financially supported by the Russian Foundation for Basic Research (grant N 10-0300305-a).