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Title:HETEROGENEOUS PHOTOCATALYTIC OXIDATION FOR THE REMOVAL OF BISPHENOL A FROM AQUEOUS SOLUTION OVER TiO2/GRAPHENE OXIDE (GO) BASED NANOCOMPOSITES
Authors:Veternik, Ana (Author)
Pintar, Albin (Mentor) More about this mentor... New window
Bortoluzzi, Marco (Mentor) More about this mentor... New window
Files:.pdf Ana_Veternik.pdf (2,96 MB)
 
Language:English
Work type:Master's thesis/paper (mb22)
Tipology:2.09 - Master's Thesis
Organization:FZO - Faculty of Environmental Sciences
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
Year of publishing:2017
Source:Nova Gorica
COBISS_ID:4691963 Link is opened in a new window
URN:URN:SI:UNG:REP:TRYCHOWP
Views:2343
Downloads:206
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Secondary language

Language:Slovenian
Title:HETEROGENA FOTOKATALITSKA OKSIDACIJA ZA ODSTRANITEV BISFENOLA A IZ VODE NA OSNOVI RAZLIČNIH TiO2/GRAFENOV OKSID (GO) NANOKOMPOZITOV
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.
Keywords:fotokataliza, titanov dioksid, grafenov oksid, bisfenol A


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