Sinteza nanokompozitnog ZnO fotokatalizatora; razgradnja Acid Blue 25 bojila

undergraduate thesis

• Title (english): Synthesis of nanocomposite ZnO photocatalyst; degradation of Acid Blue 25 dye
• Author: Ivan Vrban
• 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: 2017-09-20, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Chemical Engineering in Material Development

Abstract

Polianilin/cinkov oksid (PANI/ZnO) nanokompozitni fotokatalizatori sintetizirani su in situ, kemijskom oksidativnom polimerizacijom monomera anilina uz prisustvo ZnO nanočestica. Sinteza PANI/ZnO nanokompozitih fotokatalizatora provodila se u kiselom vodenom mediju i u neutralnom mediju s određenim udjelom organskog otapala (dietilen glikol). Pri sintezi PANI/ZnO nanokompozitnih fotokatalizatora u kiselom mediju modificiran je maseni odnos monomera anilina i cinkovog oksida (50%, 100%, 200%) te su dobiveni uzorci PANI/0,5ZnO, PANI/1ZnO i PANI/2ZnO. Sinteza PANI/ZnO nanokompozitnih fotokatalizatora u neutralnom mediju provodila se s različitim koncentracijama dietilen glikola ( 0,02 mol/dm^3, 0,024 mol/dm^3, 0,04 mol/dm^3). Maseni odnos monomera anilina i cinkova oksida pri sintezi u neutralnom mediju iznosio je 75 %. Sintezom u neutralnom mediju s određenim udjelom organskog otapala dobivena su tri uzorka (15PANI/ZnO/0,02DEG, 15PANI/ZnO/0,024DEG, 15PANI/ZnO/0,04DEG). Čisti ZnO i sintetizirani PANI/ZnO nanokompozitni fotokatalizatori karakterizirani su FTIR spektroskopijom te određivanjem elektrovodljivosti. Fotokatalitička učinkovitost PANI/ZnO nanokompozitih fotokatalizatora je bila ispitivana razgradnjom Acid Blue 25 bojila pod djelovanjem simulirane Sunčeve svjetlosti i mjerenjem apsorbancije na UV/Vis spektrometru. Rezultati istraživanja pokazuju da PANI/ZnO nanokompozitni fotokatalizatori sintetizirani u kiselom vodenom mediju pokazuju značajnu adsorpcijsku moć i manju efikasnost fotokatalitičke razgradnje AB25 bojila, a PANI/ZnO nanokompoziti fotokatalizatori sintetizirani u vodenom mediju s određenim udjelom organskog otapala slabiju adsorpcijsku moć te znatno višu efikasnost fotokataltičke razgradnje AB25 bojila.

Abstract (english)

Polyaniline/zinc oxide (PANI/ZnO) nanocomposites were synthesized by the chemical oxidative in situ polymerization of monomer aniline with the presence of ZnO nanoparticles. Synthesis has been carried out in acidic aqueous solution and in neutral aqueous solution with predefined percentage of organic solvent (Diethylene glycol). Samples PANI/0,5ZnO, PANI/1ZnO and PANI/2ZnO were synthesized in the acidic medium and the mass ratio of aniline monomer and zinc oxide was modified (50%, 100%, 200%). Synthesis of the PANI/ZnO nanocomposite photocatalysts in the neutral medium was carried out with different concentrations of diethylene glycol (0.02 mol /dm^3, 0.024 mol/dm^3, 0.04 mol/dm^3). The mass ratio of aniline and zinc oxide monomers in neutral media was 75%. Three samples (15PAN / ZnO / 0.02DEG, 15PAN / ZnO / 0.024DEG, 15PAN / ZnO / 0.04DEG) were synthesized in a neutral medium with a specific amount of organic solvent. Pure ZnO and PANI/ZnO nanocomposite photocatalysts were characterized by FTIR spectroscopy and electroconductivity. Photocatalytic efficiency of PANI/ZnO nanocomposite photocatalysts were investigated by the degradation of Acid Blue 25 dye under simulated solar irradiation and by measuring the absorbance with the UV/Vis spectrometer. The results of the research show that PANI / ZnO nanocomposite photocatalysts synthesized in acidic aqueous medium exhibit significant adsorption ability and lower efficiency of photocatalytic degradation of AB25 dye and PANI / ZnO nanocomposites synthesized in aqueous medium with a certain amount of organic solvent lower adsorption ability and significantly more efficiency of photocatalytic degradation of AB25 dye.

• Keywords: PANI/ZnO nanokompozitni fotokatalizatori; FTIR spektroskopija; fotokatalitička efikasnost; Acid Blue 25 bojilo
• Keywords (english): PANI/ZnO nanocomposite photocatalyst; FTIR spectroscopy; photocatalytic efficiency; Acid Blue 25 dye
• Language: croatian
• URN:NBN: urn:nbn:hr:149:128770
• 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: 2021-03-15 12:14:53