master's thesis
Ana Veternik (Author), Albin Pintar (Mentor), Marco Bortoluzzi (Mentor)

Abstract

Since water is an essential substance for all life on earth, it is therefore vital to prevent its pollution and to improve wastewater purification processes. There is a vast number of pollutants which can contaminate water, of which bisphenol A (known as an endocrine disruptor) is the pollutant studied herein. In this study, several TiO2/GO based nanocomposites with various GO loadings (2, 4, 10, 20 and 40%) and differently shaped nanocrystalline TiO2 phases (titanate nanotubes (TNTs) and calcined titanate nanotubes (TNTs_500)) were synthesised. All of the nanocomposites were characterised through SEM, UV-vis-DR, TGA, BET, FT-IR and CHNS analyses and were used in the heterogeneous photocatalytic degradation of bisphenol A and compared to the activity of pure TNTs and TNT_500 photocatalysts. All TiO2/GO nanocomposites exhibit much better activity than pure TNTs and TNTs_500 catalysts. The conversion of the BPA was analysed using HPLC and the mineralisation was analysed using a TOC analysis. The best experiment was performed with TNTs_500 + 10% GO composite, which can be attributed to the TiO2 crystalline structure obtained. According to the results obtained, TiO2 + 10% GO was found to exhibit the best degradation ratio, which can be ascribed to the fact that excessive GO can act as a charge carrier recombination centre and promotes the recombination of electron-hole pairs in reduced GO.

Keywords

heterogeneous photocatalysis;titanium dioxide;graphene oxide;bisphenol A;

Data

Language: English
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UNG FZO - Faculty of Environmental Sciences
Publisher: [A. Veternik]
UDC: 54
COBISS: 4691963 Link will open in a new window
Views: 4997
Downloads: 285
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: Slovenian
Secondary title: HETEROGENA FOTOKATALITSKA OKSIDACIJA ZA ODSTRANITEV BISFENOLA A IZ VODE NA OSNOVI RAZLIČNIH TiO2/GRAFENOV OKSID (GO) NANOKOMPOZITOV
Secondary abstract: Voda je osnovni vir življenja, zato si moramo prizadevati za njeno čim manjšo onesnaženost in iskati alternative za izboljšanje čiščenja odpadne vode. Škodljivih spojin, ki onesnažujejo vodo, je vedno več. V naši raziskavi smo uporabili BPA, ki je le eden izmed množice teh spojin, znan predvsem kot hormonski motilec. Z različnimi sinteznimi pogoji smo vplivali na modifikacijo in strukturo TiO2 in tako pripravili TiO2 nanocevke (TNTs) in kalcinirane TiO2 nanocevke (TNTs_500). Te smo nato sintentizirali z različno količino grafenovega oksida (2, 4, 10, 20 in 40%). Vse pripravljene nanokompozite smo karakterizirani s SEM, UV-vis-DR, TGA, BET, FT-IR in CHNS analizami ter uporabili v heterogeni fotokatalitski oksidaciji bisfenola A v vodi. Pridobljene rezultate smo primerjali s TNTs in TNTs_500. Izkazalo se je, da vsi pripravljeni nanokompoziti rezultirajo v boljši in hitrejši razgradnji bisfenola A, v primerjavi s TiO2 strukturama. Razgradnjo BPA smo ovrednotili z uporabo HPLC, mineralizacijo pa s TOC analizo. Najboljši rezultat v razgradnji BPA spojine je bil dobljen z uporabo TNTs_500 + 10% GO nanokompozita, kar pripisujemo strukturni obliki TiO2. Rezultati so tudi pokazali, da so najboljši nanokompoziti pripravljeni z 10% GO. Iz tega lahko sklepamo, da je vsebnost 10% GO optimalna. V večjih količinah GO tvori rekombinacijske centre, ki povzročijo padec fotokatalitske aktivnosti in tako počasnejšo razgradnjo BPA spojine.
Secondary keywords: fotokataliza;titanov dioksid;grafenov oksid;bisfenol A;magistrske naloge;
URN: URN:SI:UNG
Type (COBISS): Master's thesis
Thesis comment: Univ. of Nova Gorica, School of Environmental Sciences & Ca' Foscari Univ. of Venice, School of Sustainable Chemistry and Technologies
Pages: XI, 60 str.
ID: 9576363