Electrophoretic deposition (EPD) of TiO2 thin film was carried out at room temperature on low cost steel substrate using microwave synthesized nanoparticles (NPs) of TiO2. Synthesized NPs and EPD thin film were characterized at different stages of synthesis for its crystal structure, morphology, elemental analysis, and surface area. Spherical particle morphology and formation of TiO2 were confirmed by scanning electron micrograph (SEM), energy dispersive spectrometer (EDS), and X-ray diffraction (XRD). Synthesized NPs were formed in anatase phase having crystallite size of about 12.3？nm from Scherrer's formula using full width half maxima (FWHM). Surface area was found to be 43.52？m2/g by BET giving particle size of 33？nm. Photocatalytic (PC) behavior of TiO2 NPs and EPD TiO2 film on steel substrate was investigated under UV light for two commercial dyes and their photocatalysis efficiency was analyzed. NPs have shown better efficiency for methylene blue (MB) dye than EPD film whereas EPD film have shown higher PC activity for methyl red (MR) dye. 1. Introduction TiO2 is one of the transition metal oxides, having excellent optical, electrical, PC properties [1, 2]. It is optically transparent, nontoxic, wide band gap, and sensitive to UV-radiations. Apart from high photoactivity, TiO2 is biologically and chemically inert, abundantly available, and cheap. TiO2, being very reactive with both light and water, exhibits exceptional resistance to corrosion and photocorrosion in aqueous environments. Therefore, TiO2 in water exhibits stable properties over a prolonged period of time. Other than PC activity, TiO2 finds applications in the fields of gas sensors, supercapacitors, cosmetics, and solar cells [3, 4]. Because of its strong UV light absorbance, TiO2 is applied as a sunscreen blocker. The applications of TiO2 also include self-cleaning coatings, hydrophilic coatings, and antifogging coatings. Under normal atmospheric conditions and UV-Vis light, organisms that are virulent and hard to be decomposed can be thoroughly oxidized to molecules, such as H2O and CO2 by using anatase TiO2 under UV irradiation. PC reaction in the presence of TiO2 consists of a free radical reaction initiated by absorption of the photon with energy equal to or greater than the band gap of TiO2. Charge separation, leading to enhanced concentration of electron and holes at the surface, results in a substantial increase of the oxidation power of TiO2 when immersed in water. Anatase TiO2 is the most widely explored material for PC applications due to its wide band gap, for example,
References
[1]
K. Hashimoto, H. Irie, and A. Fujishima, “TiO2 photocatalysis: a historical overview and future prospects,” Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, vol. 44, no. 12, pp. 8269–8285, 2005.
[2]
J. W. Kim, H. S. Kim, K. H. Yu, A. Fujishima, and Y. S. Kim, “Enhanced photocatalytic activity of 3,4,9,10-perylenetetracarboxylic diimide modified titanium dioxide under visible light irradiation,” Bulletin of the Korean Chemical Society, vol. 31, no. 10, pp. 2849–2853, 2010.
[3]
B. Tan and Y. Wu, “Dye-sensitized solar cells based on anatase TiO2 nanoparticle/nanowire composites,” Journal of Physical Chemistry B, vol. 110, no. 32, pp. 15932–15938, 2006.
[4]
P. I. Gouma, M. J. Mills, and K. H. Sandhage, “Fabrication of free-standing titania-based gas sensors by the oxidation of metallic titanium foils,” Journal of the American Ceramic Society, vol. 83, no. 4, pp. 1007–1009, 2000.
[5]
J. A. Herrera Melian, J. M. Dona Rodriguez, A. V. Suarez et al., “The photocatalytic disinfection of urban wastewaters,” Chemosphere, vol. 41, pp. 323–327, 2000.
[6]
T. Sugimoto, X. Zhou, and A. Muramatsu, “Synthesis of uniform anatase TiO2 nanoparticles by gel-sol method: 3. Formation process and size control,” Journal of Colloid and Interface Science, vol. 259, no. 1, pp. 43–52, 2003.
[7]
J. Tang, F. Redl, Y. Zhu, T. Siegrist, L. E. Brus, and M. L. Steigerwald, “An organometallic synthesis of TiO2 nanoparticles,” Nano Letters, vol. 5, no. 3, pp. 543–548, 2005.
[8]
S. Jeon and P. V. Braun, “Hydrothermal synthesis of Er-doped luminescent TiO2 nanoparticles,” Chemistry of Materials, vol. 15, no. 6, pp. 1256–1263, 2003.
[9]
D. Byun, Y. Jin, B. Kim, J. Kee Lee, and D. Park, “Photocatalytic TiO2 deposition by chemical vapor deposition,” Journal of Hazardous Materials, vol. 73, no. 2, pp. 199–206, 2000.
[10]
M. O. Abou-Helal and W. T. Seeber, “Preparation of TiO2 thin films by spray pyrolysis to be used as a photocatalyst,” Applied Surface Science, vol. 195, no. 1–4, pp. 53–62, 2002.
[11]
S. Takeda, S. Suzuki, H. Odaka, and H. Hosono, “Photocatalytic TiO2 thin film deposited onto glass by DC magnetron sputtering,” Thin Solid Films, vol. 392, no. 2, pp. 338–344, 2001.
[12]
P. Periyat, N. Leyland, D. E. McCormack, J. Colreavy, D. Corr, and S. C. Pillai, “Rapid microwave synthesis of mesoporous TiO2 for electrochromic displays,” Journal of Materials Chemistry, vol. 20, no. 18, pp. 3650–3655, 2010.
[13]
L. Pan, Z. Sun, and C. Q. Sun, “Nanocatalysts synthesized via microwave-assisted solution phase synthesis for efficient photocatalysis,” Journal of Materials Chemistry A, vol. 1, pp. 8299–8326, 2013.
[14]
J.-G. Yu, H.-G. Yu, B. Cheng, X.-J. Zhao, J. C. Yu, and W.-K. Ho, “The effect of calcination temperature on the surface microstructure and photocatalytic activity of TiO2 thin films prepared by liquid phase deposition,” Journal of Physical Chemistry B, vol. 107, no. 50, pp. 13871–13879, 2003.
[15]
B. Neppolian, H. C. Choi, S. Sakthivel, B. Arabindoo, and V. Murugesan, “Solar/UV-induced photocatalytic degradation of three commercial textile dyes,” Journal of Hazardous Materials, vol. 89, no. 2-3, pp. 303–317, 2002.
[16]
W. Baran, A. Makowski, and W. Wardas, “The effect of UV radiation absorption of cationic and anionic dye solutions on their photocatalytic degradation in the presence TiO2,” Dyes and Pigments, vol. 76, no. 1, pp. 226–230, 2008.
[17]
M. Zhou, J. Yu, S. Liu, P. Zhai, and L. Jiang, “Effects of calcination temperatures on photocatalytic activity of SnO2/TiO2 composite films prepared by an EPD method,” Journal of Hazardous Materials, vol. 154, no. 1–3, pp. 1141–1148, 2008.
[18]
I. Corni, M. P. Ryan, and A. R. Boccaccini, “Electrophoretic deposition: from traditional ceramics to nanotechnology,” Journal of the European Ceramic Society, vol. 28, no. 7, pp. 1353–1367, 2008.
[19]
U. G. Akpan and B. H. Hameed, “Parameters affecting the photocatalytic degradation of dyes using TiO2-based photocatalysts: a review,” Journal of Hazardous Materials, vol. 170, no. 2-3, pp. 520–529, 2009.
[20]
D. S. Kim and S.-Y. Kwak, “The hydrothermal synthesis of mesoporous TiO2 with high crystallinity, thermal stability, large surface area, and enhanced photocatalytic activity,” Applied Catalysis A: General, vol. 323, pp. 110–118, 2007.
[21]
J. Zhang, X. Xiao, and J. Nan, “Hydrothermal-hydrolysis synthesis and photocatalytic properties of nano-TiO2 with an adjustable crystalline structure,” Journal of Hazardous Materials, vol. 176, no. 1–3, pp. 617–622, 2010.
[22]
M. Song, L. Bian, T. Zhou, and X. Zhao, “Surface ζ potential and photocatalytic activity of rare earths doped TiO2,” Journal of Rare Earths, vol. 26, no. 5, pp. 693–699, 2008.
[23]
I. K. Konstantinou and T. A. Albanis, “TiO2-assisted photocatalytic degradation of azo dyes in aqueous solution: kinetic and mechanistic investigations: a review,” Applied Catalysis B: Environmental, vol. 49, no. 1, pp. 1–14, 2004.
[24]
D. Jiang, H. Zhao, S. Zhang, and R. John, “Kinetic study of photocatalytic oxidation of adsorbed carboxylic acids at TiO2 porous films by photoelectrolysis,” Journal of Catalysis, vol. 223, no. 1, pp. 212–220, 2004.
[25]
J. Li, L. Zheng, L. Li, Y. Xian, and L. Jin, “Fabrication of TiO2/Ti electrode by laser-assisted anodic oxidation and its application on photoelectrocatalytic degradation of methylene blue,” Journal of Hazardous Materials, vol. 139, no. 1, pp. 72–78, 2007.
[26]
N. Koura, T. Tsukamoto, H. Shoji, and T. Hotta, “Preparation of various oxide films by an electrophoretic deposition method: a study of the mechanism,” Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes & Review Papers, vol. 34, no. 3, pp. 1643–1647, 1995.
[27]
P. B. Bagdare, S. B. Patil, and A. K. Singh, “Phase evolution and PEC performance of ZnxCd(1-x)S nanocrystalline thin films deposited by CBD,” Journal of Alloys and Compounds, vol. 506, no. 1, pp. 120–124, 2010.
[28]
J. Wang, J. Polleux, J. Lim, and B. Dunn, “Pseudocapacitive contributions to electrochemical energy storage in TiO2 (anatase) nanoparticles,” Journal of Physical Chemistry C, vol. 111, no. 40, pp. 14925–14931, 2007.
[29]
A. K. Singh and U. T. Nakate, “Photocatalytic properties of microwave-synthesized TiO2 and ZnO nanoparticles using malachite green dye,” Journal Nanoparticles, vol. 2013, Article ID 310809, 7 pages, 2013.
[30]
S. Ghasemi, S. Rahimnejad, S. Rahman Setayesh, S. Rohani, and M. R. Gholami, “Transition metal ions effect on the properties and photocatalytic activity of nanocrystalline TiO2 prepared in an ionic liquid,” Journal of Hazardous Materials, vol. 172, no. 2-3, pp. 1573–1578, 2009.
[31]
T. Bak, J. Nowotny, N. J. Sucher, and E. D. Wachsman, “Photocatalytic water disinfection on oxide semiconductors: part 1—basic concepts of TiO2 photocatalysis,” Advances in Applied Ceramics, vol. 111, no. 1-2, pp. 4–15, 2012.
