Naslov
Stabilnost elektrovodljivog polimera poli(3, 4-etilendioksitiofen) u vodenoj suspenziji pod simuliranim sunčevim zračenjem
(Stability of conducting polymer poly(3, 4-ethylenedioxytiophene) in water suspension under simulated solar irradiation)

Autori
Katančić, Zvonimir ; Kraljević, Monika ; Živković, Ivana ; Hrnjak-Murgić, Zlata

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
25. hrvatski skup kemičara i kremijskih inžinjera s međunarodnim sudjelovanjem i 3. simpozij "Vladimir Prelog" : Knjiga sažetaka = 25th croatian meeting of chemists and chemical engineers with international participation [and] 3rd symposium “Vladimir Prelog” : Book od abstracts / Đaković, Marijana ; Miljanić, Snežana ; Šantić, Ana ; Vianello, Robert - Zagreb : Hrvatsko kemijsko društvo = Croatian chemical society, 2017, 214-214

ISBN
978-953-55232-7-7

Skup
Hrvatski skup kemičara i kremijskih inžinjera s međunarodnim sudjelovanjem (25 ; 2017) ; Simpozij "Vladimir Prelog" (3 ; 2017)

Mjesto i datum
Poreč, Hrvatska, 19.04.2017. - 22.04.2017

Vrsta sudjelovanja
Poster

Vrsta recenzije
Domaća recenzija

Ključne riječi
elektrovodljivi polimeri, poli(3, 4-etilendioksitiofen), fotokataliza, sunčevo zračenje zračenjem
(conductive polymers, poly (3, 4-ethylenedioxythiophene), photocatalysis, solar irradiation)

Sažetak
Conducting polymers are today used in fuel cells, computer displays, microsurgical tools and are now finding applications in the field of photocatalysis. Common photocatalysts such as TiO2, ZnO and other semiconducting metal oxides have low activity under visible irradiation due to their wide band gap. Conducting polymers with extended  conjugated electron systems have high absorption coefficient in the visible light region. Conducting polymers are also attributed with valence and conduction bands but they have lower band gap energy so visible light irradiation can easily excite sufficient number of electrons which occupy the conduction band and stimulate the e–/h+ generation. In that way, when combined with metal oxide photocatalysts, they act as their activators and enhance their photocatalytic activity in the visible part of spectrum. In order to be used in photocatalysis of wastewaters conducting polymers need to have high chemical stability under UV and visible irradiation. For that reason in this study poly(3, 4-ethylenedioxytiophene) (PEDOT) was synthesized by chemical oxidative polymerization at two temperatures (25 and 40 °C) and at three polymerization times (24, 48 and 72 h). Obtained samples were subjected to 90 min of simulated solar irradiation in water suspension, simulating one photocatalytic cycle. Stability was tested by thermogravimetric analysis (TGA) before and after simulated photocatalysis and by measuring total organic carbon (TOC) after photocatalysis to determine the amount of possible low molecular products which could indicate polymer degradation. From TOC results it was evident that although all samples have stable structure, samples synthesized at 25 °C showed somewhat higher stability. TGA results showed that samples retain the same level of thermal stability after simulated photocatalysis. It was also evident that washing procedure after polymerization needs to be improved as excess oxidant and non-reacted monomer were present in all samples. Acknowledgements

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

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