A. V. Voit

Manganese oxide carbon fibrous materials

Changes in electrochemical properties and surface morphology of carbon fibrous materials upon modification with manganese oxides under various conditions of their deposition were studied. The composition of manganese oxides was determined. The capacitances of the electrical double layer of manganese oxide carbon fibrous materials in sodium chloride solutions of various concentrations were found. Charging parameters of the modified electrodes were determined.

Correlation of electrochemical and structural characteristics of chitosan-carbon fibrous materials

Changes in the electrochemical properties and morphology of the surface of fibrous materials in the course of their modification with chitosan were studied in relation to the conditions of biopolymer deposition. The capacitances of the electrical double layer of the chitosan-carbon materials in NaCl solutions of various concentrations were determined by of cyclic voltammetry and the method of charging curves. The parameters of charging of the modified electrodes were calculated.

Relationship between electrochemical and structural properties of modified carbon fibers

Effect of modification conditions on the electrochemical and structural properties of fibrous carbon materials was studied.

Effect of modification on electrochemical and sorption properties of woven carbon materials

Relationship between electrochemical, structural, and sorption properties of woven carbon materials modified with chitosan was studied.

INFLUENCE OF MODIFICATION ON THE ELECTROCHEMICAL PROPERTIES AND THERMAL OXIDATION STABILITY OF CARBON FIBERS

The electrochemical and thermal properties of composites prepared from carbon fiber modified by chitosan deposited on the fiber surface in various forms were investigated. The electrochemical behavior of a composite modified with chitosan in the sulfate form differed from that of starting carbon fiber and composites modified by electrochemical deposition of chitosan. The preparation conditions and subsequent electrochemical treatment affected the thermal oxidative stability of the composites. It was noted that cyclic cathodic-anodic and then cathodic treatment of the composites degraded them significantly. Cyclic voltammetry could be used to assess the surface condition of fibers modified with chitosan.

Removal of metal ions with rice husk-based sorbents

Sorption of metal ions from solutions of individual salts and their mixtures by rice husk-based sorbents was studied. The sorption properties of the rice husk were examined in relation to its modification conditions.

Heterogeneous-catalytic decomposition of ethylenediaminetetraacetic acid and its complexes with iron, nickel, and cobalt on carbon materials in nitrate media

Catalytic thermal destruction of ethylenediaminetetraacetic acid and its complexes with nickel, iron, and cobalt in nitrate solutions on carbon materials (activated unwoven material, sibunite, and BAU–A activated carbon) was studied. The activation energies of thermal destruction were calculated.

Composites based on chitosan- and gold-modified carbon fibers

We report the fabrication of composite materials containing gold particles deposited on the surface of carbon fibers, in particular, immobilized in films of chitosan, a natural biopolymer. The fabrication process involves gold-chitosan electrocodeposition on unmodified fibers or gold deposition on chitosan-carbon materials used as electrodes. Scanning electron microscopy, energy dispersive X-ray analysis, and X-ray diffraction results are used to gain insight into the role of ion exchange, complexation, and electrochemical factors in the formation of the composites.

The sorption properties of chitosan-carbon fibrous materials

The kinetics and equilibrium of sorption of copper(II) ions on natural biopolymer chitosan, activated carbon fiber, and composite materials prepared by electrochemical modification of activated carbon fibers with chitosan were studied. The influence of the conditions of modification of the microporous carbon matrix on the sorption properties of composite materials with respect to copper(II) was investigated. It was shown that changes in modification conditions could be used to control the sorption properties of chitosan-carbon materials. The mechanisms of copper(II) ion absorption by the sorption materials studied were considered.