Fotokatalitička razgradnja azo-bojila uz poli(3,4-etilendioksitiofen)/ZnO nanokompozitni fotokatalizator

undergraduate thesis

• Title (english): Photocatalytic degradation of azo dyes with poly(3,4-ethylenedioxythiophene)/ZnO nanocomposite photocatalyst
• Author: Aleksandar Tašić
• Mentor: Zlata Hrnjak-Murgić (mentor)
• Committee member: Zlata Hrnjak-Murgić (predsjednik povjerenstva)
• Committee member: Zvonimir Katančić (član povjerenstva)
• Committee member: Vanja Kosar (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2016-09-26, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Chemical Engineering in Material Development

Abstract

Pročišćavanje otpadnih voda moguće je na više načina, različitim metodama i procesima: mehaničkim uklanjanjem onečišćenja, fizikalnim, biološkim, kemijskim metodama. Fotokataliza je proces koji se ubraja u kemijske metode pročišćavanja otpadnih voda, a provodi se upotrebom fotokatalizatora od kojih su najčešći metalni oksidi (TiO2, ZnO … ). U ovom radu istraživana je efikasnost fotokatalitičke razgradnje onečišćenja, azo bojila Reactive Red 45 (RR45) u vodi uz primjenu sintetiziranog nanokompozitnog fotokatalizatora, cinkovog oksida (ZnO) i vodljivog polimera poli(3,4-etilendioksitiofen) (PEDOT). Zato je u radu provedena sinteza PEDOT/ZnO kompozitnog fotokatalizatora pri različitim omjerima monomer:oksidans (1:2; 1:3; 1:5). Sintetizirani fotokatalizatori karakterizirani su Infracrvenom spektroskopijom s Fourierovim transformacijama (FTIR), Rendgenskom difrakcijom (XRD), Pretražnom elektronskom mikroskopijom (SEM) i termogravimetrijskom analizom (TGA). Fotokataliza provedena je pod UV-A zračenjem i simuliranim Sunčevim zračenjem gdje je ispitana učinkovitost uklanjanja azo bojila Reactive Red 45 (RR45) praćenjem obezbojenja vode s UV/Vis spektroskopijom. Iz rezultata fotokatalitičke aktivnosti vidljivo je da uzorak čistog cinkova oksida ima najveću fotokatalitičku aktivnost pod oba tipa zračenja. Najmanju efikasnost uvijek pokazuje kompozit s većim udjelom polimera, što znači da se optimalni fotokatalizator postiže uz manji udio polimera.

Abstract (english)

Wastewater treatment is possible by different methods and processes: mechanical removal of impurities, physical, biological, chemical methods. Photocatalysis is one of the chemical methods of wastewater treatment and is carried out by using a photocatalyst such as metal oxides (TiO2, ZnO, ...). This paper investigated the effectiveness of photocatalytic degradation of pollution, Reactive Red 45 (RR45) azo dye, in water with the use of the synthesized nanocomposite photocatalyst, Zinc oxide (ZnO) and the conductive polymer poly (3,4-ethylenedioxythiophene) (PEDOT). Therefore, the synthesis of PEDOT/ZnO composite photocatalyst was carried out at various monomer to oxidant ratios (1:2; 1:3; 1:5). Synthesized photocatalysts were characterized by Infrared spectroscopy with Fourier transformations (FTIR), X-ray diffraction (XRD), Scanning electron microscopy (SEM) and Thermogravimetric analysis (TGA). Photocatalysis was carried out under UV-A irradiation and simulated Solar irradiation where the effectiveness of RR45 azo dye removal was followed by monitoring the discoloration of water with UV/Vis spectroscopy. From the results of photocatalytic activity it can be seen that the sample of pure Zinc oxide has the highest photocatalytic activity under both types of irradiation. The smallest effectiveness showed the composite with higher share of polymer, which means that the optimal photocatalyst is achieved with lower share of polymer.

• Keywords: fotokataliza; otpadne vode; azo bojilo RR45; cinkov oksid; vodljivi polimeri; poli(3 4-etilendioksitiofen); nanokompozitni fotokatalizator
• Keywords (english): photocatalysis; waste water; azo dye RR45; zinc oxide; conductive polymers; poly(3 4-ethylenedioxythiophene); nanocomposite photocatalyst
• Language: croatian
• URN:NBN: urn:nbn:hr:149:046905
• 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: 2018-02-19 12:42:30