N. N. Barinov

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.

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.

Amorphous silicon dioxide from waste of Ferroally production

The optimum conditions for the formation of amorphous silicon dioxide from wastes formed in ferroalloy production containing more than 99% of the main substance were determined and its physicochemical properties were studied.

Functional materials based on manganese dioxide deposited on carbon fiber

The composites manganese oxide/carbon fiber are obtained by chemical and electrochemical deposition. The process of electrodeposition was carried out in the presence of tetraalkylammonium cations of neutral SAA Triton X-100 in a potentiostatic regime by oxidating Mn2+ salts at +1.0 V (with respect to Ag/AgCl). Cathodic deposition was carried out in aqueous electrolytes NH4Cl and KCl and in the presence of polyelectrolyte of chitosan with oxidation of the formed precipitates by oxygen in air. The obtained composites are characterized by scanning electron microscopy, X-ray diffraction, and cyclic volt-amperometry techniques. The mechanism of film formation at the surface of the carbon fiber and the electrochemical properties of the composites are discussed.

Organic-Mineral Composites Copper Oxide/Chitosan/Carbon Fiber Obtained by the Electrodeposition Method

The methods of the coprecipitation of chitosan and copper-containing particles on a carbon fiber used as a cathode and also of the precipitation of copper(II) on a carbon-fiber electrode preliminarily modified by chitosan were studied for feasibility of obtaining composites containing copper oxide/copper in a chitosan matrix. The composition, morphology, structure of the organic-mineral composites were studied by the methods of X-ray phase analysis, scanning electronic microscopy, X-ray photoelectron spectroscopy, and ESR spectroscopy.

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.

Morphology and optical properties of Sb2O3

The chemical and phase compositions of antimony(III) oxide samples prepared under various conditions have been determined. The size and shape of their particles have been assessed by scanning electron microscopy, and the effect of UV irradiation on their diffuse reflectance spectra has been studied. The results are used to determine the whiteness index, integrated reflectance, and lightfastness of the samples.

Composite sorbents based on synthetic manganese oxide and carbon fiber

Manganese oxides have been prepared on the surface of carbon fiber by simple methods: coprecipitation of manganese salts of different valence in the presence of fiber as a support or electrodeposition from Mn(II) salt solution on a carbon fiber cathode, in the presence of chitosan including, under oxidation with air oxygen conditions. The obtained samples have been characterized by scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Sorption properties of the composites toward As(V) have been studied. The relationships between sorption properties, structure, Mn valence, and manganese oxide surface morphology have been discussed.

Carbon fibers modified with molybdenum for sorption of arsenic(V)

Procedure for obtaining new hybrid sorbents based on carbon fibers and chitosan-carbon materials modified with molybdenum, which determines the affinity of the sorbents for arsenate ions, is described. The surface morphology was examined and a qualitative chemical analysis of the surface of the composite sorbents was made by the method of scanning electron microscopy–energy-dispersive analysis. Sorption isotherms were obtained for unmodified materials, carbon fibers and chitosan-carbon materials, and hybrid sorbents in twicedistilled and tap water at low As(V) concentrations.