Elektrokemijska karakterizacija tankih fotokatalitičkih filmova

master's thesis

• Title (english): Electrochemical characterisation of photocatalytic thin films
• Author: Nicole Mesaroš
• Mentor: Marijana Kraljić Roković (mentor)
• Committee member: Marijana Kraljić Roković (predsjednik povjerenstva)
• Committee member: Helena Otmačić Ćurković (član povjerenstva)
• Committee member: Marin Kovačić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2019-07-08, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Cilj ovog rada bio je elektrokemijski okarakterizirati metalne okside koji se koriste u procesu fotokatalize. Provedeno je ispitivanje nanokompozita TiO2/SnS2 u otopini NaCl, s dodatkom i bez dodatka diklofenaka (DCF) te u otopini Na2SO4, s dodatkom i bez dodatka DCF. Osim toga, provedeno je ispitivanje elektrokemijski formiranog TiO2, koji je dobiven metodom kronoamperometrije na način da je titanska elektroda polarizirana tijekom 120 s na potencijalu od 1 V. Nanokompozitni fotokatalizator TiO2/SnS2 pripremljen je hidrotermalnom sintezom, a imobilizacija na titansku elektrodu je provedena metodom rotacijskog nanošenja. Elektrokemijske metode karakterizacije koje su korištene u ovom radu su ciklička voltametrija (CV), elektrokemijska impedancijska spektroskopija (EIS) i Mott-Schottky analiza. Pokazano je da je zaista došlo je do adsorpcije DCF-a na površinu fotokatalizatora, budući da se impedancijski spektar promijenio nakon njegova dodatka. Također, u ovom radu je dokazano da adsorpcija organskih tvari utječe na svojstva vanjskog, poroznog i unutarnjeg, kompaktnog sloja fotokatalizatora te na formiranje sloja prostornog naboja.

Abstract (english)

The objective of this research was electrochemical characterization of the metal oxide used in the photocatalytic processes. A study of the nanocomposite TiO2/SnS2 was performed in NaCl solution, with and without addition of diclofenac (DCF) and in Na2SO4 solution, also with and without DCF. In addition, an electrochemically-formed TiO2 was also tested. The electrochemically-formed TiO2 was obtained by using chronoamperometry method by polarization of titanium electrode for 120 s at potential of 1 V. The nanocomposite photocatalyst TiO2/SnS2 was prepared by hydrothermal method and immobilization on titanium electrode was carried out by spin-coating method. Methods of electrochemical characterization used in this work were cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and Mott-Schottky analysis. In the presence of DCF in the investigated solution the impedance spectrum was changed due to the DCF adsorption on the photocatalyst surface. It was also shown that adsorption of organic substances influence the properties of the outer, porous layer and inner, compact layer of the photocatalysts, as well as space charge layer.

• Keywords: diklofenak; elektrokemijska karakterizacija; fotokataliza; nanokompozitni fotokatalizator
• Keywords (english): diclofenac; electochemical characterization; photocatalysis; nanocomposite photocatalyst
• Language: croatian
• URN:NBN: urn:nbn:hr:149:046850
• 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
• Study programme: Title: Materials Science and 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 resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2022-02-26 09:47:15