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Photocatalytic hydrogen generation over alkali niobates in the presence of organic compounds

Zielińska B., Sreńscek-Nazzal J., Kaleńczuk R.J.

Polish Journal of Chemical Technology

2008

Vol. 10, nr 4

1-3

The photocatalytic efficiency of alkali niobate-based compounds (Li, Na, K) for hydrogen generation has been investigated. The systematic study showed that the highest photocatalytic activity was observed in the case of Na/Nb2O5 catalyst which contained sodium niobate (NaNbO3) phase and that the most efficient electron donor for hydrogen generation was formic acid. In addition, the effect of organic donor (HCOOH) concentration on the amount of the evolved hydrogen was studied.

Preparation of Nb2O5 Photocatalysts Modified by Alkali Metals (Li, Na, K) and Its Photocatalytic Performance

Zielińska B., Arabczyk M.

Polish Journal of Chemistry

2007

Vol. 81, nr 7

1355-1362

The paper reports the results of a preparation of photocatalysts based on niobium pentaoxide (Nb2O5). These materials have been obtained by calcination of a Nb2O5 precursor with alkali metal hydroxides (Li,Na, K). The obtainedmaterials have been characterized by several methods, i.e., XRD, DR-UV-vis, and FTIR/DRS. The photocatalytic decomposition of phenol as amodel contaminant has been investigated in the presence of all the prepared photocatalytic materials under UV-light irradiation. Of all investigated samples, Na/Nb2O5 has the highest activity.