Modifikacija i karakterizacija PPy/TiO2 nanokompozitnog fotokatalizatora

undergraduate thesis

• Title (english): Modification and characterization of PPy/TiO2 nanocomposite photocatalyst
• Author: Anamarija Šijaković
• Mentor: Zlata Hrnjak-Murgić (mentor)
• Committee member: Zlata Hrnjak-Murgić (predsjednik povjerenstva)
• Committee member: Ljerka Kratofil Krehula (član povjerenstva)
• Committee member: Marijana Kraljić Roković (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2018-09-20, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Chemical Engineering in Material Development

Abstract

U ovom radu provedena je in situ sinteza vodljivog polimera polipirola (PPy) uz prisustvo nanočestica titanijeva dioksida (TiO2) za pripremu nanokompozitnog fotokatalizatora (PPy/TiO2). Modificiranje PPy/TiO2 fotokatalizatora provedeno je deprotoniranjem s amonijevim hidroksidom (NH4OH) dok je proces reprotoniranja proveden s klorovodičnom kiselinom (HCl) s ciljem da se istraži utjecaj promijene vodljivosti PPy na katalitičku efikasnost tijekom procesa fotokatalize. Postupci reprotoniranja i deprotoniranja provedni su u različitim vremenskim periodima. Uzorci su okarakterizirani infracrvenom spektroskopijom s Fourierovom transformacijom (FTIR) i mjerenjem elektrovodljivosti nultog i modificiranih PPy/TiO2 fotokatalizatora. Efikasnost fotokatalitičke razgradnje organskog azo bojila Reactive Red 45 (RR45), koje je korišteno kao onečišćenje u vodi, odnosno stupanj njegovog uklanjanja praćen je mjerenjem apsorbancije UV/VIS spektroskopijom. Također, određena je i mineralizacija RR45 bojila, odnosno određena je koncentracija ukupnog organskog ugljika (TOC) koji je prisutan u otpadnoj vodi nakon fotokalize. Iz rezultata fotokatalitičke aktivnosti PPy/TiO2 katalizatora vidljivo je da se ona mijenja s modifikacijom, tj. s promjenom vodljivosti PPy odnosu na čisti sintetizirani fotokatalizator.

Abstract (english)

In this paper, in situ synthesis of conductive polymer polypyrole (PPy) in the presence of nanoparticles titanium dioxide (TiO2) for the preparation of nanocomposite photocatalyst (PPy/TiO2) was performed. Modification of PPy/TiO2 photocatalyst was carried out by deprotonation with the ammonium hydroxide (NH4OH) while the reprotonation process was carried out with hydrochloric acid (HCl) to explore the influence of PPy conductivity variation on catalytic efficiency during photocatalysis. Reprotonation and deprotonation procedures are performed for different period of time. Samples are characterized by Infrared Fourier Transform Transformation (FTIR) spectroscopy and by measurement conductivity of pure and modified PPy/TiO2 photocatalysts. Efficacy of photocatalytic degradation of organic azo dye Reactive Red 45 (RR45) was followed, which was used as a water contaminant. The degree of RR45 removal was monitored by measuring the absorbance by UV/VIS spectroscopy. Also, the mineralization of RR45 was determined as it represents the concentration of total organic carbon (TOC) present in the wastewater after photocatalysis. From the photocatalytic activity of the PPy/TiO2 catalyst, it is apparent that it changes with modification, i.e. with the change of conductivity of PPy compared to the synthesized photocatalyst.

• Keywords: modifikacija polipirola; vodljivi polimeri; nanokompozitni fotokatalizatori; azo bojila; fotokataliza
• Keywords (english): modification of polypyrole; conductive polymers; nanocomposite photocatalysts; azo dyes; photocatalysis
• Language: croatian
• URN:NBN: urn:nbn:hr:149:843959
• Project: Number: IP-2013-11-5092; Title: Razvoj fotokatalitičkih polimernih nanokompozita za obradu otpadnih voda; Title: Development of Photocatalytic Polymer Nanocomposites for Wastewater Treatment; Acronym: DePoNPhoto; Leader: Zlata Hrnjak-Murgić; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: IP
• Study programme: Title: Materials Science and 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: 2022-05-26 13:40:36