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master's thesis
Aktivnost i postojanost ZnO prevlaka kod fotokatalitičke razgradnje onečišćivala
Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology, 2018. urn:nbn:hr:149:612951
Kolenić, Mateja
University of Zagreb
Faculty of Chemical Engineering and Technology

Institutional repository: Repository of Faculty of Chemical Engineering and Technology University of Zagreb

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Kolenić, M. (2018). Aktivnost i postojanost ZnO prevlaka kod fotokatalitičke razgradnje onečišćivala (Master's thesis). Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:149:612951

Kolenić, Mateja. "Aktivnost i postojanost ZnO prevlaka kod fotokatalitičke razgradnje onečišćivala." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2018. https://urn.nsk.hr/urn:nbn:hr:149:612951

Kolenić, Mateja. "Aktivnost i postojanost ZnO prevlaka kod fotokatalitičke razgradnje onečišćivala." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2018. https://urn.nsk.hr/urn:nbn:hr:149:612951

Kolenić, M. (2018). 'Aktivnost i postojanost ZnO prevlaka kod fotokatalitičke razgradnje onečišćivala', Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, accessed 26 November 2024, https://urn.nsk.hr/urn:nbn:hr:149:612951

Kolenić M. Aktivnost i postojanost ZnO prevlaka kod fotokatalitičke razgradnje onečišćivala [Master's thesis]. Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology; 2018 [cited 2024 November 26] Available at: https://urn.nsk.hr/urn:nbn:hr:149:612951

M. Kolenić, "Aktivnost i postojanost ZnO prevlaka kod fotokatalitičke razgradnje onečišćivala", Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb, 2018. Available at: https://urn.nsk.hr/urn:nbn:hr:149:612951

Metadata
TitleAktivnost i postojanost ZnO prevlaka kod fotokatalitičke razgradnje onečišćivala
Title (english)Activity and stability of ZnO coatings during photocatalytic degradation of pollutants
AuthorMateja Kolenić
MentorJelena Macan (mentor)
Committee memberJelena Macan (predsjednik povjerenstva)
Committee memberDragana Mutavdžić Pavlović (član povjerenstva)
Committee memberDavor Dolar (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Chemical Engineering and Technology
Zagreb
Defense date and country2018-07-03, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Chemical Engineering
Chemical Engineering in Material Development
Abstract
Cilj ovog rada bio je ispitati aktivnost i postojanost prevlaka ZnO tijekom fotokatalitičke reakcije razgradnje onečišćivala. Prevlake ZnO sintetizirane su metodom kemijskog taloženja iz metanolnih otopina cinkovog acetata dihidrata koncentracija 0,15 i 0,50 mol dm^-3. Kao podloge, korištena su predmetna stakalca i staklena mrežica. Dobivene prevlake sintetizirane su 41 h pri 55 °C te su žarene u peći 2 h pri 400 °C. Sintetizirane prevlake karakterizirane su pretražnom elektronskom mikroskopijom. Fotokatalitička aktivnost sintetiziranih prevlaka tj. fotokatalizatora ispitana je u protočnom fotokatalitičkom reaktoru razgradnjom onečišćivala, 2,5-dihidroksibenzojeve kiseline, pod djelovanjem UV ili sunčevog zračenja. UV/Vis spektrofotometrom pratila se promjena koncentracije onečišćivala. Sve ispitane prevlake pokazale su fotokatalitičku aktivnost što je rezultiralo smanjenjem koncentracije otopine onečišćivala. Pod UV zračenjem nakon 4 h reakcije dolazi do smanjenja koncentracije za više od 40 %. Pod simuliranim sunčevim zračenjem koncentracija nakon 4 h smanji se za manje od 10 %. Analizirajući kinetiku reakcije, dobivene konstante brzine reakcija također su veće za reakcije pod UV zračenjem od onih pod simuliranim sunčevim zračenjem. Temperatura provođenja reakcije, podloga na koju se nanosi fotokatalizator ni morfologija sintetiziranih fotokatalizatora ne utječu znatno na njihovu djelotvornost.
Abstract (english)
The aim of this study was to investigate activity and stability of ZnO coatings during the photocatalytic degradation of pollutant. ZnO coatings were prepared by chemical bath deposition from zinc acetate dihydrate dissolved in methanol, concentration 0.15 and 0.50 mol dm^-3. As substrates were used microscope slides and glass mesh. Coatings were synthesised for 41 h at 55 °C and annealed 2 h at 400 °C. Prepared coatings were characterized by scanning electron microscopy. Photocatalytic activity of prepared photocatalyts was tested in circulating photocatalytic reactor. Degradation of pollutatant, 2,5- dihydroxybenzoic acid, was tracked under the UV or solar radiation. The change in concentration of 2,5-dihydroxibenzoic acid solution was monitored by UV/Vis spectrometry. All tested coatings were photocatalytically active, which was shown in decreasing of concentration of pollutant. Under UV radiation after 4 h of reaction the concentration of 2,5-dihydroxibenzoic acid solution decreased more than 40 %. Under solar radiation, concentration decreased less than 10 %. Reactions under UV radiation were much faster than reactions under solar radiation. Temperature of reaction, substrates on which coatings were deposited and morphology of prepared coatings didn’t significantly affect their photocatalytic efficiency.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:149:612951
Study programmeTitle: Chemical Engineering - Graduate study
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
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Created on2020-05-08 08:57:59