Primjena WO3/BiVO4 elektrode u fotoelektrokemijskoj razgradnji amoksicilina

master's thesis

• Title (english): Application of WO3/BiVO4 electrode for the photoelectrochemical degradation of amoxicillin
• Author: Iva Mihaljević
• Mentor: Marijana Kraljić Roković (mentor)
• Committee member: Marijana Kraljić Roković (predsjednik povjerenstva)
• Committee member: Zoran Mandić (član povjerenstva)
• Committee member: Danijela Ašperger (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2022-09-28, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Cilj ovog rada bio je ispitati strukturna, optička i fotoelektrokemijska svojstva WO3 i WO3/BiVO4 fotoaktivnih materijala te izraditi elektrode pogodne za primjenu u fotoelektrokemijskim procesima. Pri tome su ispitane WO3 fotoelektrode, fotoelektrode WO3/BiVO4 dvoslojne strukture, i fotoelektrode WO3/BiVO4 homogene smjese. Struktura fotoelektroda određena je metodom rendgenske difrakcije praha, a optička svojstva ispitana su metodom ultraljubičaste/vidljive spektroskopije. Za elektrokemijsku karakterizaciju korištene su metode linearna voltametrija, elektrokemijska impedancijska spektroskopija, Mott-Schottky analiza, te je praćen potencijal otvorenog kruga u vremenu. Fotoelektrokemijski proces degradacije amoksicilina proveden je metodom kronoamperometrije. Promatran je utjecaj različitih elektrolita (NaCl i Na2SO4) i žarenja fotoelektroda na uspješnost degradacije amoksicilina. Učinkovitost procesa određena je praćenjem promjena koncentracija amoksicilina tekućinskom kromatografijom visoke djelotvornosti. Rezultati karakterizacije elektrokemijskim metodama pokazali su dobru fotoaktivnost WO3 i WO3/BiVO4 fotoelektroda. Praćenjem promjene potencijala otvorenog kruga i Mott-Schottky analizom pokazano je da su analizirani fotokatalitički materijali poluvodiči n-tipa. Rezultati HPLC analize ukazuju da su WO3/BiVO4 fotoelektrode dvoslojne strukture najučinkovitije u degradaciji amoksicilina.

Abstract (english)

The main goal of this study was to examine the structural, optical and photoelectrochemical properties of WO3 and WO3/BiVO4 photoactive materials and to create electrodes suitable for use in photoelectrochemical processes. Therefore, WO3 photoelectrodes, WO3/BiVO4 photoelectrodes with two-layer structure and WO3/BiVO4 homogeneous mixture photoelectrodes were tested. The structure of the photoelectrodes was determined by the X-ray powder diffraction method, and the optical properties were examined by the ultraviolet/visible spectroscopy method. For electrochemical characterization, methods of linear voltammetry, electrochemical impedance spectroscopy, Mott-Schottky analysis were used, and the open circuit potential was monitored over time. The photoelectrochemical process of amoxicillin degradation was carried out using chronoamperometry. The influence of different electrolytes (NaCl and Na2SO4) and photoelectrode annealing on the success of amoxicillin degradation was observed. The efficiency of the process was determined by monitoring changes in amoxicillin concentration using high-performance liquid chromatography. The results of electrochemical characterization showed good photoactivity of WO3 and WO3/BiVO4 photoelectrodes. Monitoring the change of the open circuit potential and Mott-Schottky analysis showed that the analyzed photocatalytic materials were n-type semiconductors. The results of the HPLC analysis indicated that WO3/BiVO4 photoelectrodes with a two-layer structure are the most effective in the degradation of amoxicillin.

• Keywords: amoksicilin; bizmutov vanadat; fotoelektrokemijski proces; fotokatalizator; volframov (VI) oksid
• Keywords (english): amoxicillin; bismuth vanadate; photoelectrochemical process; photocatalyst; tungsten (VI) oxide
• Language: croatian
• URN:NBN: urn:nbn:hr:149:773483
• Project: Number: IP-2018-01-1982; Title: Nano-katalizatori aktivirani Sunčevim zračenjem u tehnologijama zaštite okoliša; Title: Nano-sized solar-active catalysts for environmental technologies; Acronym: NaSCEnT; Leader: Hrvoje Kušić; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: IP
• Project: Number: KK.01.1.1.04.0001; Title: Pročišćavanje vode i dobivanje energije korištenjem novih kompozitnih materijala uz Sunčevo zračenje; Leader: Hrvoje Kušić; Jurisdiction: eu; Funder: EC; Funding stream: KF
• Study programme: Title: Applied Chemistry - Graduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Environmental chemistry and green technologies; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra primijenjene kemije (magistar/magistra primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access; Embargo expiration date: 2023-09-01
• Created on: 2023-03-28 10:03:24