Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5384959 | Chemical Physics Letters | 2010 | 6 Pages |
Hg0(g) is known to undergo photo-catalytic oxidation by UVA-irradiated TiO2 surfaces. One micrometre layers of TiO2 on quartz glass were irradiated within the 240-800 nm range. Gaseous mercury was measured by mass spectrometry single ion monitoring. The surface configuration and elemental characterization of TiO2 layer was evaluated using scanning electron microcopy with energy dispersive spectroscopy. The LH adsorption constant of was found to be KHg = (5.1 ± 2.4) Ã 10â14 cm3 and an apparent surface deposition rate of k = (7.4 ± 2.5) Ã 1014 minâ1 cmâ2 under experimental conditions. Water did not affect the rate constant. We show TiO2 could be employed to reduce mercury concentrations in gas streams, even at very high Hg0 concentrations.
Graphical abstractUVA-initiated oxidation of gaseous mercury over a titania catalyst. In principle this system has the potential to scrub out toxic mercury fumes from an emission source. Mercury is trapped as the non-volatile oxide HgO.Download high-res image (66KB)Download full-size image