Ocjena efikasnosti fotokatalitičke razgradnje bojila PANI/TiO2 nanokompozitom

master's thesis

• Title (english): Efficiency assessment of photocatalytic degradation of dye with PANI/TiO2 nanocomposites
• Author: Katarina Novaković
• Mentor: Zlata Hrnjak-Murgić (mentor)
• Committee member: Zlata Hrnjak-Murgić (predsjednik povjerenstva)
• Committee member: Zvonimir Katančić (član povjerenstva)
• Committee member: Mark Žic (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2016-07-15, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Chemical Engineering in Material Development

Abstract

Titanijev dioksid (TiO2) kao metalni poluvodič sve više se istražuje u procesima pročišćavanja otpadnih voda. U takvim procesima koristi se kao fotokatalizator, za fotokatalitičku razgradnju brojnih organskih onečišćenja u otpadnim vodama. TiO2 se pojavljuje u trima kristalnim oblicima: anatas, rutil i brukit; pri čemu fotokatalitičku aktivnost pokazuju anatas i rutil. Budući da vidljivi dio Sunčevog zračenja nema dovoljnu energiju da bi se aktivirao anatas oblik TiO2, on se može aktivirati samo pod djelovanjem UV svjetla, koje čini svega oko 5% ukupnog Sunčevog zračenja. Upravo zbog toga, sintetiziraju se polimerni nanokompoziti s vodljivim polimerima, kako bi se povećala aktivnost TiO2 u vidljivom dijelu spektra Sunčevog zračenja. U radu su sintetizirani polimerni nanokompoziti s polianilinom (PANI) u prisustvu i TiO2 gdje je modificiran udio PANI polimera (1, 5, 10, 15, 20 i 25 %) tijekom polimerizacije, a kao oksidans korišten je amonijev persulfat (APS). Tako pripremljeni uzorci karakterizirani su; infracrvene spektroskopije s Fourierovim transformacijama (FTIR), UV/Vis spektroskopijski te im je određena elektrovodljivosti. Fotokatalitička učinkovitost sintetiziranih PANI/TiO2 polimernih nanokompozita praćena je fotokatalitičkom razgradnjom azo bojila Reactive Red 45 (RR45) pod simulacijskim Sunčevim zračenjem i mjerenjem apsorbancije (A) na UV/Vis spektrometru. Ukupno organsko onečišćenje praćeno je TOC analizama. Rezultati istraživanja pokazuju da najveću fotokatalitičku učinkovitost ima sintetizirani 15PANI/TiO2 polimerni nanokompozit te je fotokatalitička djelotvornost navedenog polimernog nanokompozita pod vidljivim svjetlom učinkovitija u odnosu na čisti TiO2.

Abstract (english)

Titanium dioxide, TiO2 as metal semiconductor is increasingly being investigated in wastewater treatment processes. In such processes it is used as a photocatalyst for the photocatalytic decomposition of many organic pollutants in waste water. TiO2 appears in three crystalline forms: anatase, rutile and brookite; where the photocatalytic activity shows anatase and rutile. The visible part of the solar irradiation does not enough sufficient energy to activate the TiO2 anatase form; it can be activated only under UV light, which is only 5% of the total solar irradiation. Because of this, synthesized polymer nanocomposites with conductive polymers, increase the activity of TiO2 in the visible part of spectrum of solar irradiation. Polymer nanocomposites of various mass fraction of polyaniline (PANI), and TiO2 were synthesized by chemical oxidation polymerization, where the oxidizing agent ammonium persulfate (APS) was used. The photocatalytic efficiency of the synthesized PANI/TiO2 nanocomposites was followed by a photocatalytic degradation of azo dye Reactive Red 45 (RR45) under simulated solar irradiation and by measuring the absorbance (A) with the UV/Vis spectrometer. Characterization methods were electroconductivity, Fourier transform infrared spectroscopy (FTIR) and UV/Vis reflection. Total organic carbon was measured by TOC analysis. The research results show that the highest photocatalytic efficiency has synthesized polymer nanocomposite (w(PANI/TiO2) = 15%) 15PANI/TiO2 and the photocatalytic efficiency of this polymer nanocomposite under visible light is more effective comapred to pure TiO2.

• Keywords: titanijev dioksid (TiO2); vodljivi polimeri; polianilin (PANI); fotokatalitička aktivnost; Reactiv Red 45 azo bojilo
• Keywords (english): titanium dioxide (TiO2); conductive polymers; polyaniline (PANI); photocatalytic activity; Reactive Red 45 azo dye
• Language: croatian
• URN:NBN: urn:nbn:hr:149:080355
• Study programme: Title: Environmental Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka ekoinženjerstva (magistar/magistra inženjer/inženjerka ekoinženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Repository: Repository of Faculty of Chemical Engineering and Technology University of Zagreb
• Created on: 2017-07-06 13:08:56