"0"^^ . "Mechanismus fotokatalytick\u00E9 degradace herbicid\u016F na oxidu titani\u010Dit\u00E9m" . . . "Herbicidy jako velkoplo\u0161n\u00E9 aplikovan\u00E9 agrochemik\u00E1lie pat\u0159\u00ED k nejz\u00E1va\u017En\u011Bj\u0161\u00EDm \u0161kodlivin\u00E1m \u017Eivotn\u00EDho prost\u0159ed\u00ED. Vzhledem k n\u00EDzk\u00E9 rozpustnosti a chemick\u00E9 stabilit\u011B pronikaj\u00ED pozvolna p\u016Fdou a\u017E do spodn\u00EDch zdroj\u016F pitn\u00FDch vod a dlouhodob\u011B je zamo\u0159uj\u00ED. Fotokatalytick\u00E1 mineralizace na oxidu titani\u010Dit\u00E9m je nov\u011B zkou\u0161en\u00E1 metoda na odstra\u0148ov\u00E1n\u00ED organick\u00E9ho i mikrobiologick\u00E9ho zne\u010Di\u0161t\u011Bn\u00ED vody s vyu\u017Eit\u00EDm slune\u010Dn\u00ED energie. Jej\u00ED podstatou je fotochemick\u00E1 tvorba vysoce reaktivn\u00EDch hydroxylov\u00FDch radik\u00E1l\u016F, kter\u00E9 \u00FA\u010Dinn\u011B atakuj\u00ED organick\u00E9 slou\u010Deniny a umo\u017E\u0148uj\u00ED t\u00EDm jejich n\u00E1slednou oxidaci vzdu\u0161n\u00FDm kysl\u00EDkem. Detailn\u00ED studium mechanism\u016F t\u011Bchto d\u011Bj\u016F lze s v\u00FDhodou prov\u00E1d\u011Bt v koloidn\u00EDch roztoc\u00EDch velmi mal\u00FDch \u010D\u00E1stic oxidu titani\u010Dit\u00E9ho (Q-TiO2), kter\u00E9 na rozd\u00EDl od vodn\u00FDch suspenz\u00ED velk\u00FDch \u010D\u00E1stic nerozptyluj\u00ED sv\u011Btlo, a t\u00EDm umo\u017E\u0148uj\u00ED jednak p\u0159esn\u011B stanovit kvantov\u00E9 v\u00FDt\u011B\u017Eky a tak\u00E9 za pomoci rychl\u00E9 spektroskopie p\u0159\u00EDmo pozorovat prim\u00E1rn\u00ED procesy p\u0159enosu n\u00E1boje a reakc\u00ED vznikaj\u00EDc\u00EDch kr\u00E1tce \u017Eij\u00EDc\u00EDch transient\u016F. Herbicidy ze skupiny hal" . . . "Herbicides as wide-spread applied agrochemicals belong among hazardous wastes polluting environment. Because of their low solubility and chemical stability, they penetrate slowly trough soil into drinking water resources and contaminate them in a long-term period. Photocatalytic mineralization on titanium dioxide represents a newly developed solar energy utilizing technology for both organic and microbiological decontamination of water. It is based on photochemical generation of highly reactive hydroxylradicals which react effectively with organic substrates and initialize so their additional mineralization by oxygen. A detailed investigation of mechanisms of these processes can be advantageously performed in colloidal solutions of extremely small par ticles of titanium dioxide (Q-TiO2) which, in contrast to aqueous suspensions of large particles, do not scatter light and thus enable exact determinations of quantum yields and also direct observations of both primary processes of the charge transfer an"@en . . "GA203/98/P080" . . "Mechanismus of photocatalytic degradation of herbicides on TiO2"@en . "Studium mechanismu a kinetiky fotokatalytick\u00FDch degradac\u00ED herbicid\u016F (diuronu, metamitronu) na \u010D\u00E1stic\u00EDch TiO2. V\u00FDsledkem projektu jsou 4 p\u0159\u00EDsp\u011Bvky na konferenc\u00EDch a 4 p\u0159ipravovan\u00E9 odborn\u00E9 publikace. V\u00FDsledky \u0159e\u0161en\u00ED lze pova\u017Eovat za dostate\u010Dn\u00E9 po dopln\u011Bn\u00ED"@cs . . . . "0"^^ . "http://www.isvav.cz/projectDetail.do?rowId=GA203/98/P080"^^ . . . "1"^^ . . "0"^^ . . . . "0"^^ . .