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Publications (29)
New Poly(lactic acid)/Polyvinylpyrrolidone, containing green synthesized Hydrozincite (GHZ) emulsion elec-trospun fibers and drop spread films possessing antibacterial and photocatalytic activity were prepared. The PLA/PVP/GHZ films possess higher photocatalytic efficiency towards Malachite Green (MG) dye discoloration (85%) than that of the fibers...
This study aimed to present the differences in the corrosion properties and protective ability of two bi-layer systems obtained on low-carbon steel in a model corrosive medium of 5% NaCl solution. These newly developed systems consist of Zn-Co (3 wt.%) or Zn-Ni (10 wt.%) alloy coatings as under-layers and a very thin TiO2 sol-gel film as a top-laye...
Zinc oxide arouses considerable interest since it has many applications—in microelectronics, environmental decontaminations, biomedicine, photocatalysis, corrosion, etc. The present investigation describes the green synthesis of nanosized ZnO particles using a low-cost, ecologically friendly approach compared to the classical methods, which are aim...
Enhanced corrosion efficiency of low-carbon steel was achieved by newly developed hybrid multilayers, composed of low-carbon steel coated with an electrodeposited zinc sublayer (1 µm), a chitosan (CS) middle layer and ZrO2 coating by the sol–gel method (top-layer). The middle chitosan layer was obtained by dipping galvanized steel substrate in 3% t...
Dense, highly textured, hydrophobic ZrO2-TiO2 (1:1) coatings with amorphous structure were prepared using the sol-gel method. Both organic and inorganic zirconium precursor salts were used. The present study dealt with the investigation of their protective ability in a selected model corrosive medium with chloride ions as corrosion activators. The...
The presence of triple phase TiO2 new mixture (Magneli of higher order homologous series, brookite and anatase) containing P dopant ensures positive changes in the structure, in the phase composition and in the chemical composition. These changes explained the reasons for the enhanced UV/Vis photocatalytic efficiency towards oxidative degradation o...
Improved corrosion protection of low-carbon steel was achieved by barrier non-toxic sol–gel multilayered structures composed of a ZrO2 top coating and TiO2 underlayers. The zirconium precursor solution was maintained as constant, whereas the TiO2 solution composition was modified with two different types of polymers, which were added separately to...
Two series of Pd–MeOx/Al2O3 (Me = Co, La, Ce) catalysts were prepared and tested in reaction of methane combustion. The first series comprises the samples obtained by impregnation of γ-Al2O3 with the corresponding salts of La and Ce and additionally modified with Co. For the second series the LaCeAl2O3 SG and LaAl2O3 SG supports were prepared by th...
The present work was devoted to study the catalytic activity of lanthanum and cerium oxides separately, deposited on γ-alumina in the reaction of decomposition of nitric oxide. The catalyst samples were prepared by the method of impregnation of γ-Al2O3 using solutions, containing nitrates of lanthanum and cerium. The prepared samples were calcined...
A two-step method has been applied to the synthesis of zinc orthostannate, Zn2SnO4. As a first step X-ray amorphous hydroxide precursor had been obtained by coprecipitation of Zn(NO3)2 and SnCl2 solutions using Na2CO3. In the second step the precursor was subjected to hydrothermal treatment (HT) in the presence of sodium hydroxide or ammonium hydro...
Orthorhombic polycrystalline calcium titanate (CaTiO 3 ) powders were synthesized by hydrothermal method, followed by mechanical activation (MA). The samples were analyzed by X-ray diffraction (XRD), BET method, SEM analysis and IR spectroscopy. It should be pointed out that the mechanical activation leads to slight widening of the peaks without sh...
Abstract
The research work presents Cu-Ni oxide catalysts, deposited on γ-Al2O3
support and thereafter calcined at various temperatures: 400 ◦C, 500 ◦C, 600 ◦C
and 700 ◦C. The catalyst samples have been prepared by the impregnation
method using aqueous solutions of nitrates, containing Cu and Ni. The catalysts
have been characterized by means of X-...
Three different precipitating agents (NaOH, \(\hbox {NH}_{4}(\hbox {H})\hbox {CO}_{3}\) and \(\hbox {CO}(\hbox {NH}_{2})_{2}\)) have been applied for the hydrothermal synthesis of ZnO powder materials, aiming at obtaining various types of porosity and surface species on ZnO. The synthesis procedures were carried out in the presence and in the absen...
Biphasic CuO–NiO solids were synthesised using mechanical activation and thermal treatment of a mixture of nickel oxalate and copper oxalate at different temperatures (400, 500, 600 and 700°C). XRD analysis identified two crystalline phases in the samples with the structures of CuO Tenorite and NiO Bunsenite, accordingly. A change in the catalytic...
In order to check to what extent the slag-based glass-ceramics may be used as carriers in the preparation of active supported catalysts, copper-cobalt oxide catalysts on different carriers (glass-ceramics obtained :on the basis of blast furnace slag) were studied. The catalytic activity towards the complete oxidation of carbon monoxide was evaluate...
In this study ZnO photocatalysts were prepared by polymer-assisted precipitation, followed by hydrothermal treatment at 140 °C. The precursors were zinc acetate and a three-block copolymer. The obtained materials were char- acterized by X-ray diffraction (XRD), infrared spectroscopy (IRS) and BET analysis. The X-ray analysis and IRS proved the form...
The paper is devoted to Cu-Co oxide catalysts deposited on a commercially available high-temperature support containing aluminum, magnesium and silicon, calcined at different temperatures: 350, 450, 550, 650 and 750 degrees C. The samples are prepared by impregnation with aqueous solutions of Cu and Co nitrates. The catalysts are characterized by X...
The object of the present investigations is a catalyst sample possessing a spinel-like structure, comprising copper, zinc and aluminum oxides in a ratio Cu:Zn:Al = 1:1:4. The conditions of co-precipitation of copper - zinc ammonia-carbonate solutions and a solution of aluminum nitrate ensure nano-size dimensions of the precursors and high dispersio...
This paper presents the investigations and the results on Pd-containing catalysts on corundum support and NiO, deposited subsequently by the impregnation method. The physical chemical characteristics of Pd/NiO composites on alumina support have been studied and their catalytic properties have been tested in the process of NO reduction by CO. The ca...
La-modified alumina-supported copper oxide and cobalt oxide catalysts were investigated. The catalyst samples were prepared by impregnation of supports (γ-Al 2O 3 or La-modified γ-Al 2O 3) with a mixed aqueous solution of Cu and Co nitrates. The samples were characterized by ICP analysis, X-ray powder diffraction (XRD) and BET method. The catalytic...
A silver-based storage catalyst was synthesized and characterized in searching of alternative to the conventional Pt/BaCO3/Al2O3 catalyst for neutralization of nitrogen oxides in automotive exhaust gases. It was established that the Ag/BaCO3/Al2O3 catalyst reaches its highest activity at a temperature of 500 °C, showing lower activity when compared...
The influence of the nature of the impregnating solutions media (aqueous or non-aqueous) on the forming of active phases is
investigated in case of preparing iron catalysts, supported on activated carbon with respect to their catalytic activity in
the reaction of NO reduction by CO. The catalysts are characterized by chemical analysis (AAS), BET su...
The aim of this investigation is to check the possibility of using, after Pd extraction, the residue of deactivated alumina–palladium catalyst as a component of an oxide composite, as well as to establish the effect of Pd on the catalyst activity. In order to do so, Cu–Co active phase was impregnated on catalyst containing Pd residue (synthesized c...
The possibility of lowering the temperatures of crystallization of spinel-like cordierite, mullite, MgAl2O4, and corundum was studied. The following naturally occurring clay materials were used for the synthesis of supports: bentonite, clay, and kieselguhr. The effect of the preparation procedure on the structure and texture characteristics of the...
A copper–cobalt oxide spinel supported on high-temperature aluminosilicate carriers (90 wt% boehmite (pseudoboehmite)+10 wt% activated bentonite, calcined at Tcalcin=800, 1000, 1050 or 1150°C) has been prepared, characterized and tested in CO–O2 and CO–NO reactions. X-ray diffraction (XRD) has shown the presence of different forms of Al2O3 in the c...
The present work considers the formation of an appropriate Cu-Co spinel structure, supported on pure Al 2 O 3 and Al 2 O 3 modified with MgO. The prepared catalyst samples have been characterized by X-ray photoelectron spectra (XPS), X-ray diffraction analysis (XRD) and AAS. The specific surface area has been determined by the BET method. The catal...