This powerpoint presentation begins by providing a brief overview of Cyanobacteria and their toxins, and Microcystin-LR (MC-LR). Topics presented include the following: toxicity of MC-LR; health incidents; regulations; monitoring Cyano-HABs; persistence and decomposition of MCs in
natural waters; Cyanobacteria and toxins affecting water treatment; MC-LR treatment-conventional methods; MC-LR treatment-AOTs; synthesis of TiO<sub>2</sub> photocatalysts: challenges; synthesis approach: surfactant-templates; analytical methods for the quantification of
MC-LR#, CYN and detection of intermediates; overall charge of TiO<sub>2</sub> and MC-LR f = (pH); time intervals: MC-LR and intermediates; potential MC-LR sites of hydroxyl radical attack; chemical mechanisms of AOTs; and, mechanistic steps of AOTs. Presentation conclusions indicate that:
nanostructured TiO<sub>2</sub> photocatalytic films successfully degraded MC-LR
and CYN;
identification of 4 positions that HRs generated with TiO<sub>2</sub> photocatalysis
can initially react with MC-L,
Sites A, B, C: intermediates where the Adda chain is affected;
Site C -- complete removal of the Adda chain; the diene bonds are more susceptible to free radicals (m/z =1029.5),
Sites D: intermediates with alternation in the cyclic structure;
main mechanistic steps for MC-LR and CYN included
Isomerization,
Hydroxylation (Substitution/Addition),
Oxidation, and
bond cleavage. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 2.1 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 33 |
| Published : | 11/01/2008 |
