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PANI/NaTaO3 composite photocatalyst for enhanced hydrogen generation under UV light irradiation

Zielińska B., Schmidt B., Mijowska E., Kaleńczuk R.

Polish Journal of Chemical Technology

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2017

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Vol. 19, nr 3

115--119

EN

A PANI/NaTaO3 composite was successfully synthesized by an oxidative polymerization of aniline monomer in hydrochloric acid solution containing sodium tantalate. NaTaO3 at a monoclinic structure was produced via hydrothermal method. The photocatalytic activities of the unmodified NaTaO3 and PANI/NaTaO3 were evaluated for hydrogen generation from an aqueous HCOOH solution and under UV light irradiation. The results showed that the evolution rate of H2 increased significantly when NaTaO3 was modified with PANI. The enhancement of the photocatalytic activity of PANI/NaTaO3 composite was ascribed to the effective charge transfer and separation between NaTaO3 and PANI, which reduced their recombination. This indicates that PANI modification of tantalate photocatalysts may open up a new way to prepare highly efficient catalytic materials for H2 generation.

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The effect of alkali metals on the surface area of iron catalyst for ammonia synthesis

Jasińska I., Moszyński D., Arabczyk W., Kaleńczuk R.

Polish Journal of Chemical Technology

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2003

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Vol. 5, nr 4

70-72

EN

The surface area of the iron catalyst for ammonia synthesis impregnated with lithium, sodium, potassium and cesium was examined. The concentration of the respective element (expressed in mole fraction) in the bulk of the catalyst sample was varied from near zero to 1.5-10~3. The increase in the concentration of the promoter led to the decrease of the surface area of the catalyst regardless of the element present in the bulk. The exponential equation has been proposed to describe this dependence. The empirical factor AM o from the mentioned equation, which differs from element to element, was correlated with the difference between the formation enthalpy of A12O3 and the respective alkali metal oxide. The observed dependence obeys a linear law.

3

Badania nowych procesów technologicznych przyjaznych środowisku

Kaleńczuk R., Kałucki K.

Ekologia i Technika

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2000

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R. 8, nr 5

138-143

PL

Przedstawiono opracowaną technologię produkcji nawozów o obniżonej zawartości substancji bądź to zanieczyszczających glebę, bądź korzystnych ze względów agrotechnicznych oraz technologię nowej generacji nawozów płynnych do intensywnego nawożenia upraw. W kolejnym bloku tematycznym przedstawiono wyniki badań nad procesami preparatyki i zastosowania nowych materiałów magazynujących na preparowanych materiałach węglowych oraz wyniki badań fotokatalitycznej metody rozkładu wody. W badaniach nad zastosowaniem biomasy jako źródła energii zastosowano proces destylacji membranowej jako węzeł separacji w bioreaktorze membranowym. Ciągłe wydzielanie tworzących się podczas fermentacji metabolitów wpływa na zwiększenie wydajności tego procesu i zapobiega spadkowi produktywności bioreaktora.

EN

A new technology for production of fertilizers characterized by a lower content of substances contaminating the soil and/or beneficial according to agrotechnical aspects and a technology of the new generation liquid fertilizers for the intensive fertilization have been presented. Moreover, the results of studies on preparation and application of new materials for storage on prepared carbon materials as well as the results of studies on photocatalytical method of water decomposition have been described. Membrane distillation as a separation junction in membrane bioreactor has been applied as an energy source in studies on biomass application. Continuous formation of metabolites during fermentation has an effect on increasing the process yield and prevents the reduction of bioreactor productivity.