Sinteza poli(3,4-etilendioksitiofen)/TiO2 nanokompozitnog fotokatalizatora i ispitivanje učinkovitosti UV-A fotokatalize

undergraduate thesis

• Title (english): Synthesis of poly(3,4-ethylen-dioxythiophene)/TiO2 nanocomposite photocatalyst and testing of UV-A photocatalysis efficiency
• Author: Roko Perković
• Mentor: Zlata Hrnjak-Murgić (mentor)
• Committee member: Zlata Hrnjak-Murgić (predsjednik povjerenstva)
• Committee member: Zvonimir Katančić (član povjerenstva)
• Committee member: Jozefina Katić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2016-09-21, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Interdisciplinary Technical Sciences; Environmental Engineering

Abstract

Otpadne vode predstavljaju značajan ekološki problem zbog sadržaja različitih organskih spojeva čija je prisutnost nepoželjna. Kao takve ne mogu se ispustiti u okoliš bez prethodne odgovarajuće obrade. Pored tradicionalnih metoda obrade, napredni oksidacijski procesi (AOP) jedna su od mogućnosti obrade otpadnih voda. Jedna od metoda obrade voda je fotokataliza koja uključuje razgradnju onečišćenja katalizatorima pod utjecajem svjetla. U radu su sintetizirani polimerni nanokompoziti s poli(3,4-etilendioksitofenom) u prisustvu TiO2 s ciljem dobivanja fotokatalizatora. Ispitivan je utjecaj različitih oksidansa, APS i FeCl3 na strukturu nanokompozitnih fotokatalizatora što ima za posljedicu različito fotokatalitičko djelovanje. Sintetizirani nanokompozitni fotokatalizatori karakterizirani su FTIR spektroskopijom radi usporedbe kemijskog sastava, rendgenskom difrakcijom analizom (XRD) analizirana je kristalna struktura dobivenih kompozita te im je određena elektrovodljivost. Fotokatalitička aktivnost ispitana je praćenjem uklanjanjem bojila, Reactive Red 45 (RR45) i Acid Blue 25 (AB25) pod djelovanjem UV-a zračenja. Uklanjanje bojila, odnosno promjena obezbojenja u vodi praćena je mjerenjem apsorbancije na UV/VIS spektrofotometru. Uklanjanje bojila, tj. njegova mineralizacija (potpuna razgradnja) praćena je određivanjem ukupnog organskog ugljika (TOC). Rezultati ispitivanja su pokazali da je veće uklanjanje obojenja za oba bojila (RR45, AB25) pokazao PEDOT/Ti-1 uzorak. Sintetizirani fotokatalizatori pokazali su jednak stupanj mineralizacije bojila (približno jednake vrijednosti TOC-a) kao i čisti TiO2 katalizator.

Abstract (english)

Wastewaters present a significant ecological problem because of different organic compound content whose presence is undesirable so they cannot be discharged into effluents without prior adequate treatment. Besides traditional methods of treatment, advanced oxidation processes (AOP) could be one of the possibilities for the treatment of such type of wastewaters. One method of treatment is photocatalysis, which involves the development of new polymer nanocomposites with extended photocatalytic activity moved to the visible region of the UV/Vis spectrum of solar irradiation. In this work the polymer nanocomposites were synthesized with poly(3,4-ethylenedioxythiophene) in the presence of TiO2 in order to obtain the photocatalyst. The effect of the various oxidants (APS and FeCl3) on the structure of nanocomposite photocatalyst was studied, which results in different photocatalytic activity. Synthesized nanocomposite photocatalysts were characterized by FTIR spectroscopy to compare the chemical composition, X-ray diffraction analysis (XRD) was used to analyse the crystal structure, and the conductivity of the obtained composite was determined. Photocatalytic activity was investigated by monitoring the removal of dyes, Reactive Red 45 (RR45) and Acid Blue 25 (AB25) under the UV-A irradiation. Removal of dyes and their change of discoloration in the water were monitored by measuring the absorbance with UV/VIS spectrophotometer. Removal of dyes, i.e. its mineralization (complete decomposition) was followed by the determination of total organic carbon (TOC). The results showed that the higher removal of colorization for both dyes (RR45, AB25) was obtained by PEDOT/Ti-1 sample. Synthesized photocatalysts showed approximately the same degree of dyes mineralization (approximately equal value of TOC) as well as the pure TiO2 catalyst.

• Keywords: vodljivi polimeri; PEDOT; fotokatalizatori; fotokataliza; napredni oksidacijski procesi; titanijev dioksid
• Keywords (english): conductive polymer; PEDOT; photocatalysts; photocatalysis; advanced oxidation processes; titanium dioxide
• Language: croatian
• URN:NBN: urn:nbn:hr:149:726296
• Study programme: Title: Chemical Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2018-02-13 11:19:32