Badano fotokatalityczny rozkład bojowych środków trujących na modyfikowanym tlenku tytanu(IV). Zaobserwowano zmiany stężenia par iperytu siarkowego w próbkach ze zmodyfikowanym tlenkiem tytanu(IV). W przypadku badań prężności par somanu nie zaobserwowano znaczącej zmiany ich stężenia w obecności sorbentu. Wyniki badań wskazują na potencjalne możliwości wykorzystania modyfikowanego powierzchniowo TiO₂ jako nieorganicznego odkażalnika.
EN
A surface-modified TiO₂ with Ag, Cr or Nd ions was placed in tightly closed vials with a chem. warfare agent (S mustard or soman). Changes in the vapor pressure of the warfare gases over the TiO₂ samples were measured by means of GC anal. The results were compared with the photocatalytic decompn. of chem. warfare agents in the presence of unmodified TiO₂. 88-98% S mustard decompn. in the presence of modified TiO₂ was obtained. In the case of soman vapors, no significant changes in concns. were observed in the presence of sorbent.
UV filters are classified as environmental pollutants (emerging pollutants). One of the most frequently detected UV filters in real samples is 2-phenylbenzimidazole-5-sulfonic acid (PBSA). It has been shown that conventional technologies applied in sewage treatment plants are not adapted for complete removal of sunscreen agents. Therefore, there is a trend to undertake activities leading to improvement of water quality by enhancing treatment methods. This is important due to the fact that in an aqueous environment, in the presence of UV radiation or sunlight irradation, PBSA generates reactive oxygen species that can damage the DNA of living organisms. The aim of study was to investigate an effect of pH and TiO2 on PBSA stability in the presence of UV radiation. It was found that the rate of PBSA degradation depends on the catalyst dose and pH of solution. The photocatalysis reaction was carried out in a Heraeus laboratory exposure set equipped with a 150 W medium pressure mercury lamp. The course of PBSA degradation process as a function of time was monitored using UV/VIS spectrophotometer and liquid chromatograph equipped with UV-Vis detector.
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