| Autor: |
Feitz, Andrew J., Waite, T. David, Boyden, Brace H., Jones, Gary J. |
| Zdroj: |
Journal of Advanced Oxidation Technologies; January 2002, Vol. 5 Issue: 1 p22-26, 5p |
| Abstrakt: |
A solar immobilized-catalyst photocatalytic reactor design and TiO2attachment procedure is presented. The reactor is used to remove cyanobacterial toxins from drinking water samples spiked with trace levels of microcystin-LR (MLR). The reactor is randomly packed with TiO2coated ceramic Raschig rings, which provide a large surface area without compromising aperture area. The true quantum efficiency of the reactor ranges from 2.4 - 2.8% for dichloroacetic acid mineralization. At pH 7, no removal of M L R is observed under simulated dark conditions suggesting that adsorption and air stripping have negligible effect in the removal of microcystin-LR from drinking water. Rapid removal of MLR is observed once exposed to sunlight and little difference is detected between the removal rates under cloudy or sunny conditions. The virtual independence of degradation rates for low to moderate levels of cloud cover is due to the ability of the nonconcentrating reactor to harness diffuse light (unlike concentrating reactors which require direct irradiation) and minimize reflection losses. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
