20.500.12556/RUNG-2947-a37f1918-3bb3-db67-73b7-2af90c6a5f00
HETEROGENEOUS PHOTOCATALYTIC OXIDATION FOR THE REMOVAL OF BISPHENOL A FROM AQUEOUS SOLUTION OVER TiO2/GRAPHENE OXIDE (GO) BASED NANOCOMPOSITES
HETEROGENA FOTOKATALITSKA OKSIDACIJA ZA ODSTRANITEV BISFENOLA A IZ VODE NA OSNOVI RAZLIČNIH TiO2/GRAFENOV OKSID (GO) NANOKOMPOZITOV
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.
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.
heterogeneous photocatalysis
titanium dioxide
graphene oxide
bisphenol A
fotokataliza
titanov dioksid
grafenov oksid
bisfenol A
true
true
false
Angleški jezik
Slovenski jezik
Magistrsko delo/naloga
2017-02-06 22:50:22
2017-02-23 13:43:14
2023-06-09 03:19:36
0000-00-00 00:00:00
2017
0
Nova Gorica
0
0000-00-00
NiDoloceno
NiDoloceno
NiDoloceno
0000-00-00
0000-00-00
0000-00-00
4691963
URN:SI:UNG:REP:TRYCHOWP
Ana_Veternik.pdf
Ana_Veternik.pdf
1
1D8360BDDB24DF8D567D1A4B57CC88BE
3da3ac0775778e37bb7317a77b6fef0887b6c09a5948b4f33e8d8493bc9b0952
2ad59dba-05ce-11ee-9c48-5ef991fed68f
https://repozitorij.ung.si/Dokument.php?lang=slv&id=5656
Fakulteta za znanosti o okolju
0
0
0