Please use this identifier to cite or link to this item: https://open.uns.ac.rs/handle/123456789/29160
Title: Photolytic and photocatalytic degradation of selected herbicides in aqueous media
Fotolitička i fotokatalitička razgradnja odabranih herbicida u vodenoj sredini
Authors: Despotović Vesna 
Keywords: photocatalytic degradation of herbicides, natural water, TiO2 Degussa P25, TiO2 Wackherr, TiO2 nanotube, toxicity, mechanism photodegradation;fotokatalitička razgradnja herbicida, TiO2 Degussa P25, TiO2 Wackherr, TiO2 nanocevi, prirodne vode, toksičnost, mehanizam fotorazgradnje
Issue Date: 10-Jul-2014
Publisher: Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu
University of Novi Sad, Faculty of Sciences at Novi Sad
Abstract: <p>Ispitana je kinetika i mehanizam fotokatalitičke&nbsp;razgradnje herbicida kvinmeraka i klomazona u prisustvu&nbsp;UV/TiO<sub>2</sub>&nbsp; Degussa P25, odnosno piklorama i&nbsp; klopiralida&nbsp;<br />primenom UV/TiO<sub>2</sub>&nbsp; Wackherr pri različitim&nbsp;eksperimentalnim uslovima. Praćena je i kinetika&nbsp;razgradnje odabranih herbicida direktnom fotolizom uz&nbsp;primenu sunčevog, UV i vidljivog zračenja, kao i u&nbsp;odsustvu svetlosti. Pored toga, upoređena je efikasnost&nbsp;<br />UV/TiO<sub>2</sub>&nbsp; Degussa P25, odnosno UV/TiO<sub>2</sub>&nbsp; Wackherr sa&nbsp;vidljivim zračenjem, kao i direktnom fotolizom u&nbsp;prisustvu pomenutih izvora svetlosti.&nbsp; U cilju procene&nbsp;<br />citotoksičnosti klomazona i klopiralida, kao i sme&scaron;e&nbsp;klomazona i klopiralida i njihovih intermedijera nastalih&nbsp;tokom fotokatalitičke razgradnje ispitan je&nbsp; in vitro&nbsp; rast&nbsp;<br />ćelijskih linija&nbsp; MRC-5 i H-4-II-E.&nbsp; Nakon ispitivanja&nbsp;fotokatalitičke razgradnje odabranih herbicida u dvaput&nbsp;destilovanoj vodi, praćena je njihova razgradnja i u&nbsp;prirodnim vodama. Takođe, ispitan je uticaj dodatka&nbsp;hidrogenkarbonata i huminske kiseline na efikasnost&nbsp;razgradnje odabranih herbicida. Fotokatalitička razgradnja&nbsp;klomazona, piklorama i mekopropa je ispitivana i u&nbsp;prisustvu UV/TiO<sub>2</sub>&nbsp; nanocevi. Aktivnost katalizatora TiO<sub>2&nbsp;</sub>Wackherr&nbsp; i TiO<sub>2</sub>&nbsp; nanocevi je upoređena sa TiO<sub>2</sub>&nbsp; Degussa&nbsp;P25.</p>
<p>The kinetics and mechanism of photocatalytic degradation&nbsp;of the herbicides quinmerac and clomazone in the&nbsp;presence of UV/TiO<sub>2</sub>&nbsp; Degussa P25, and of picloram and&nbsp;clopyralid using UV/TiO<sub>2</sub>&nbsp; Wackherr under different&nbsp;experimental conditions were studied. The kinetics of&nbsp;degradation of selected herbicides by direct photolysis&nbsp;using sunlight, UV and visible radiation, and in the&nbsp;absence of light were followed. In addition, the&nbsp;efficiencies of UV/TiO<sub>2</sub>&nbsp; Degussa P25 and UV/TiO<sub>2&nbsp;</sub>Wackherr &nbsp;were compared with visible radiation and direct&nbsp;photolysis in the presence of the above mentioned light&nbsp;sources. In order to evaluate the cytotoxicity of clomazone&nbsp;<br />and clopyralid alone and in their mixture with&nbsp;intermediates formed during the photocatalytic&nbsp;degradation, in vitro growth of cell lines, MRC-5 and H-4-II-E was followed. After examining&nbsp; the photocatalytic&nbsp;degradation of selected herbicides in double distilled&nbsp;water, their decomposition in natural waters was also&nbsp;followed. Also, the influence of hydrogencarbonate and&nbsp;humic acid addition on the efficiency of degradation of&nbsp;selected herbicides was studied. Photocatalytic&nbsp;degradations of clomazone, picloram and mecoprop were&nbsp;investigated in the presence of UV/TiO<sub>2&nbsp;</sub>nanotubes. Activities of the catalysts TiO<sub>2</sub>&nbsp; Wackherr and TiO<sub>2&nbsp;</sub>nanotubes were compared to TiO<sub>2</sub> Degussa P25.</p>
URI: https://open.uns.ac.rs/handle/123456789/29160
Appears in Collections:PMF Teze/Theses

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