The TiO2 coatings were fabricated in phosphate-based electrolyte on pure titanium by micro-arc oxidation (MAO); then, they were impregnated with Fe3+-containing electrolyte to produce the Fe3+/TiO2 composite coatings. The physical and chemical properties of two coatings were investigated by SEM, XRD, AFM, XPS and EDS. A UV–vis spectrophotometer was also used to study photocatalytic properties of the coatings. It is indicated that the coating formed in phosphate-based electrolyte were composed of anatase and rutile phase with varying fraction depending on the applied frequency. XPS results revealed that Ti 2p spin-orbit components of Fe3+/TiO2 composite coatings are shifted towards higher binding energy, with respect to TiO2 coatings, suggesting that some of the Fe3+ ions are incorporated into TiO2 lattice. The Fe3+/TiO2 composite coatings showed an obvious enhanced photocatalytic activity than that of the TiO2 coating under irradiation.
Medina-RamírezI, LiuJL, Hernández-RamírezA, Synthesis, characterization, photocatalytic evaluation, and toxicity studies of TiO2–Fe3+ nanocatalyst. J Mater Sci. 2014;49:5309–5323. doi: 10.1007/s10853-014-8234-z
2.
FotiouT, TriantisTM, KaloudisT, Photocatalytic degradation of water taste and odour compounds in the presence of polyoxometalates and TiO2: intermediates and degradation pathways. J Photochem Photobiol A: Chem. 2014;286:1–9. doi: 10.1016/j.jphotochem.2014.04.013
3.
DieboldU. The surface science of titanium dioxide. Surf Sci Rep. 2003;48:53–229. doi: 10.1016/S0167-5729(02)00100-0
BourasP, StathatosE, LianosP. Pure versus metal-ion-doped nanocrystalline titania for photocatalysis. Appl Catal B: Environ. 2007;73:51–59. doi: 10.1016/j.apcatb.2006.06.007
6.
MatsunagaT, TomodaR, NakajimaT, Photoelectrochemical sterilization of microbial cells by semiconductor powders. FEMS Microbiol Lett. 1985;29:211–214. doi: 10.1111/j.1574-6968.1985.tb00864.x
7.
ManessPC, SmolinskiS, BlakeDM, Bactericidal activity of photocatalytic TiO2 reaction: toward an understanding of its killing mechanism. Appl Environ Microbiol. 1999;65:4094–4098.
8.
OhnoT, TokiedaK, HigashidaS, Synergism between rutile and anatase TiO2 particles in photocatalytic oxidation of naphthalene. Appl Catal A: Gen. 2003;244:383–391. doi: 10.1016/S0926-860X(02)00610-5
9.
GopalJ, GeorgeRP, MuraleedharanP, Photocatalytic inhibition of microbial adhesion by anodized titanium. Biofouling. 2004;20:167–175. doi: 10.1080/08927010400008563
AkbarzadehR, UmbarkarSB, SonawaneRS, Vanadia–titania thin films for photocatalytic degradation of formaldehyde in sunlight. Appl Catal A: Gen. 2010;374:103–109. doi: 10.1016/j.apcata.2009.11.035
12.
ChenCC, HuSH, FuYP. Effects of surface hydroxyl group density on the photocatalytic activity of Fe3+-doped TiO2. J Alloys Comp. 2015;632:326–334. doi: 10.1016/j.jallcom.2015.01.206
13.
AnT, LiuJ, LiG, Structural and photocatalytic degradation characteristics of hydrothermally treated mesoporous TiO2. Appl Catal A: Gen. 2008;350:237–243. doi: 10.1016/j.apcata.2008.08.022
14.
EvansP, EnglishT, HammondD, The role of SiO2 barrier layers in determining the structure and photocatalytic activity of TiO2 films deposited on stainless steel. Appl Catal A: Gen. 2007;321:140–146. doi: 10.1016/j.apcata.2007.01.039
15.
RicoV, RomeroP, HuesoJL, Wetting angles and photocatalytic activities of illuminated TiO2 thin films. Catal Today. 2009;143:347–354. doi: 10.1016/j.cattod.2008.09.037
16.
KitanoM, MatsuokaM, UeshimaM, Recent developments in titanium oxide-based photocatalysts. Appl Catal A: Gen. 2007;325:1–14. doi: 10.1016/j.apcata.2007.03.013
17.
ZhangJZ, LiuX, GaoSM, From AgI/TiO2 to Ag/TiO2: effects of the annealing temperature on the compositions, porous nanostructures, and visible-light photocatalytic properties. Ceram Int. 2013;39:1011–1019. doi: 10.1016/j.ceramint.2012.07.021
18.
BayatiMR, Golestani-FardF, MoshfeghAZ. Visible photodecomposition of methylene blue over micro arc oxidized WO3–loaded TiO2 nano-porous layers. Appl Catal A: Gen. 2010;382:322–331. doi: 10.1016/j.apcata.2010.05.017
19.
BayatiMR, MoshfeghAZ, Golestani-FardF. On the photocatalytic activity of the sulfur doped titania nano-porous films derived via micro-arc oxidation. Appl Catal A: Gen. 2010;389:60–67. doi: 10.1016/j.apcata.2010.09.003
20.
XiangN, SongRG, XiangB, A study on photocatalytic activity of micro-arc oxidation TiO2 films and Ag+/MAO-TiO2 composite films. Appl Surf Sci. 2015;347:454–460. doi: 10.1016/j.apsusc.2015.04.136
21.
XiangN, ZhuangJJ, SongRG, Fabrication and photocatalytic activity of MAO-TiO2 films formed on titanium doped with cations. Mater Technol. 2016;31:332–336.
22.
WanL, LiJF, FengJY, Anatase TiO2 films with 2.2eV band gap prepared by micro-arc oxidation. Mater Sci Eng B. 2007;139:216–220. doi: 10.1016/j.mseb.2007.02.014
23.
KimYS, ShinKR, KimGW, Photocatalytic activity of TiO2 film containing Fe2O3 via plasma electrolytic oxidation. Surf Eng. 2016;32:443–447. doi: 10.1179/1743294415Y.0000000077
24.
YavariSA, NeculaBS, Fratila-ApachiteiLE, Biofunctional surfaces by plasma electrolytic oxidation on titanium biomedical alloys. Surf Eng. 2016;32:411–417. doi: 10.1179/1743294415Y.0000000101
25.
XiangN, SongRG, XiangB, Preparation and photocatalytic activity of MAO-TiO2 films formed on titanium doped with V2O5 and Ag2O. Mater Technol. 2016;31:58–63. doi: 10.1179/1753555715Y.0000000028
26.
ChenMA, OuYC, YuCY, Corrosion performance of epoxy/BTESPT/MAO coating on AZ31 alloy. Surf Eng. 2016;32:38–46. doi: 10.1179/1743294415Y.0000000105
27.
YerokhinAL, LeylandA, MatthewsA. Kinetic aspects of aluminium titanate layer formation on titanium alloys by plasma electrolytic oxidation. Surf Coat Technol. 2002;200:172–184.
28.
OhHJ, ChiCS. Eu–N-doped TiO2 photocatalyst synthesized by micro-arc oxidation. Mater Lett. 2012;86:31–33. doi: 10.1016/j.matlet.2012.07.021
29.
StojadinovicS, RadicN, GrbicB, Structural, photoluminescent and photocatalytic properties of TiO2:Eu3+ coatings formed by plasma electrolytic oxidation. Appl Surf Sci. 2016;370:218–228. doi: 10.1016/j.apsusc.2016.02.131
30.
YaoZP, JiangZH, SunXT, Influence of the frequency on the structure and corrosion resistance of ceramic coatings on Ti–6Al–4V alloy produced by micro-plasma oxidation. Mater Chem Phys. 2005;92:408–412. doi: 10.1016/j.matchemphys.2005.01.062
31.
KarthickSN, PrabakarK, SubramaniaA, Formation of anatase TiO2 nanoparticles by simple polymer gel technique and their properties. Powder Technol. 2011;205:36–41. doi: 10.1016/j.powtec.2010.08.061
