Environmental Engineering Research

Korean Society of Environmental Engineers (대한환경공학회)
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Study of COD Removal Efficiency from Synthetic Wastewater by Photocatalytic Process

  • Rojviroon, Orawan (Department of Civil Engineering, Faculty of Engineering, Rajamangala University of Technology Thanyaburi) ;
  • Rojviroon, Thammasak (Department of Civil Engineering, Faculty of Engineering, Rajamangala University of Technology Thanyaburi) ;
  • Sirivithayapakorn, Sanya (Department of Environmental Engineering, Faculty of Engineering, Kasetsart University)
  • Received : 2014.05.23
  • Accepted : 2014.08.26
  • Published : 2014.09.30
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Abstract

In this research, we compared the COD removal efficiencies of titanium dioxide ($TiO_2$) thin films coated on the surfaces of borosilicate glass that prepared by three different numbers of coating layer; i) 3 layers ii) 4 layers and iii) 5 layers by sol-gel method. All of the prepared $TiO_2$ thin films consisted of pure anatase crystalline structure with grain sizes in the range 20-250 nm. The calculated optical band gaps of the $TiO_2$ thin films were 3.24. The total apparent surface area per total weight of $TiO_2$ thin films were 4.74, 3.86 and $2.79m^2g^{-1}$ for 3, 4 and 5 layers coating, respectively. The kinetics of the photodegradation reactions of COD under UVA light source were described by the Langmuir-Hinshelwood (L-H) kinetic model. The specific rates of the photodegradation of $TiO_2$ thin films at 3 layers coating was $1.40{\times}10^{-4}min^{-1}mW^{-1}$, while for the 4 layers coating and the 5 layers coating were $1.50{\times}10^{-4}$ and $4.60{\times}10^{-4}min^{-1}mW^{-1}$, respectively. The photocatalytic performance of COD degradation was higher with smaller grain size, higher surface area and narrow optical band gaps. Moreover, the numbers of coating layer on substrate also have great influence for kinetic of COD removal.

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References

  1. Zhao N, Liu Y, Chen J. Regional industrial production's spatial distribution and water pollution control: A plant-level aggregation method for the case of a small region in China. Sci. Total Environ. 2009;407:4946-4953. https://doi.org/10.1016/j.scitotenv.2009.05.023
  2. Hu Y, Cheng H. Water pollution during China's industrial transition. Environmental Development 2013;8:57-73. https://doi.org/10.1016/j.envdev.2013.06.001
  3. Hegazi HA, Removal of heavy metals from wastewater using agricultural and industrial wastes as adsorbents. HBRC Journal 2013;9:276-282. https://doi.org/10.1016/j.hbrcj.2013.08.004
  4. Dvorak L, Lederer T, Jirku V, Masak J, Novak R. Removal of aniline, cyanides and diphenylguanidine from industrial wastewater using a full-scale moving bed biofilm reactor. Process Biochem. 2014;49:102-109. https://doi.org/10.1016/j.procbio.2013.10.011
  5. Barrera-Diaz C, Frontana-Uribe B, and Bilyeu B. Removal of organic pollutants in industrial wastewater with an integrated system of copper electrocoagulation and electrogenerated $H_2O_2$. Chemosphere 2014;105:160-164. https://doi.org/10.1016/j.chemosphere.2014.01.026
  6. Javadian H, Ahmadi M, Ghiasvand M, Kahrizi S, Katal R. Removal of Cr(VI) by modified brown algae Sargassum bevanom from aqueous solution and industrial wastewater. J. Taiwan Inst. Chem. Eng. 2013;44: 977-989. https://doi.org/10.1016/j.jtice.2013.03.008
  7. Rajaram T, Das A. Water pollution by industrial effluents in India: Discharge scenarios and case for participatory ecosystem specific local regulation. Futures 2008;40:56-69. https://doi.org/10.1016/j.futures.2007.06.002
  8. Zhang Y, Deng Y, Zhao Y, Ren H. Using combined bio-omics methods to evaluate the complicated toxic effects of mixed chemical wastewater and its treated effluent. J. Hazard. Mater. 2014;272:52-58. https://doi.org/10.1016/j.jhazmat.2014.02.041
  9. Yin W-J, Chen S, Yang J-H, Gont X-G, Yan Yanfa, Wei S-H. Effective band gap narrowing of anatase $TiO_2$ by strain along a soft crystal direction. Appl. Phys. Lett. 2010;96:221901. https://doi.org/10.1063/1.3430005
  10. Yuan Z, Zhang J, Li B, Li J. Effect of metal ion dopants on photochemical properties of anatase $TiO_2$ films synthesized by a modified sol-gel method. Thin Solid Films 2007;515:7091-7095. https://doi.org/10.1016/j.tsf.2007.02.101
  11. Xiao X, Zhang WD. Facile synthesis of nanostructured BiOI microspheres with high visible light-induced photocatalytic activity. J. Mater. Chem. 2010;20: 5866-5870. https://doi.org/10.1039/c0jm00333f
  12. Yan J, Zhou F. $TiO_2$ nanotubes: Structure optimization for solar cells. J. Mater. Chem., 2011;21:9406-9418. https://doi.org/10.1039/c1jm10274e
  13. Awitor KO, Rafqah S, Geranton G, et al. Photo-catalysis using titanium dioxide nanotube layers. J. Photochem. Photobiol. A: Chem. 2008;199:250-254. https://doi.org/10.1016/j.jphotochem.2008.05.023
  14. Boulamanti AK, Philippopoulos CJ. Photocatalytic degradation of C5-C7 alkanes in the gas-phase. Atmos. Environ. 2009;43:3 168-3174. https://doi.org/10.1016/j.atmosenv.2009.03.036
  15. Gamage McEvoy J, Zhang Z. Antimicrobial and photocatalytic disinfection mechanisms in silver-modified photocatalysts under dark and light conditions. Journal of Photochemistry and Photobiology C: Photochemistry Reviews, 2014;19:62-75. https://doi.org/10.1016/j.jphotochemrev.2014.01.001
  16. Long M, Wang J, Zhuang H, Zhang Y, Wu H, Zhang J. Performance and mechanism of standard nano-$TiO_2$ (P-25) in photocatalytic disinfection of foodborne microorganisms- Salmonella typhimurium and Listeria monocytogenes. Food Control 2014;39:68-74. https://doi.org/10.1016/j.foodcont.2013.10.033
  17. Akpan UG, Hameed BH. The advancements in sol-gel method of doped-$TiO_2$ photocatalysts. Applied Catalysis A: General 2010;375:1-11. https://doi.org/10.1016/j.apcata.2009.12.023
  18. Hasan MM, Haseeb A, Masjuki HH, Saidur R. Adhesion and wear behavior of nanostructured titanium oxide thin films. International Journal of Mechanical and Materials Engineering, 2010;5:5-10.
  19. Rojviroon T, Sirivithayapakorn S. Properties of $TiO_2$ thin films prepared using sol-gel process. Surf. Eng. 2013;29:77-80. https://doi.org/10.1179/1743294412Y.0000000076
  20. Lu X, Ma Y, Tian B, Zhang J. Preparation and characterization of Fe-$TiO_2$ films with high visible photoactivity by autoclaved-sol method at low temperature. Solid State Sci. 2011; 13:625-629. https://doi.org/10.1016/j.solidstatesciences.2010.12.036
  21. Rojviroon T, Laobuthee A, Sirivithayapakorn S. Photocatalytic Activity of Toluene under UV-LED Light with $TiO_2$ Thin Films. Int. J. Photoenergy 2012; 2012:8, Article ID 898464.
  22. Eshaghi A, Pakshir M, Mozaffarinia R. Preparation and characterization of $TiO_2$ sol-gel modified nanocomposite films. J. Sol-Gel Sci. Technol. 2010;55:278-284. https://doi.org/10.1007/s10971-010-2246-1
  23. Hamdy MS, Saputera WH, Groenen EJ, Mul G. A novel $TiO_2$ composite for photocatalytic wastewater treatment. J. Catal. 2014;310:75-83. https://doi.org/10.1016/j.jcat.2013.07.017
  24. Gao Y, Wang H, Wu J, Zhao R, Lu Y, Xin B. Controlled facile synthesis and photocatalytic activity of ultrafine high crystallinity $TiO_2$ nanocrystals with tunable anatase/rutile ratios. Appl. Surf. Sci. 2014;294:36-41. https://doi.org/10.1016/j.apsusc.2013.12.107
  25. Augugliaro V, Loddo V, Palmisano G, Palmisano L, Pagliaro M. Clean by light irradiation practical applications of supported $TiO_2$. 1st ed. 2010, Cambridge: The Royal Society of Chemistry. 278.
  26. Ge L, Xu M, and Fang H. Photo-catalytic degradation of methyl orange and formaldehyde by Ag/$InVO_4$-$TiO_2$ thin films under visible-light irradiation. J. Mol. Catal. A: Chem. 2006;258:68-76. https://doi.org/10.1016/j.molcata.2006.05.026
  27. Murphy AB. Band-gap determination from diffuse reflectance measurements of semiconductor films, and application to photoelectrochemical water-splitting. Sol. Energy Mater. Sol. Cells 2007;91:1326-1337. https://doi.org/10.1016/j.solmat.2007.05.005
  28. Prochazka J, Kavan L, Shklover V, et al. Multilayer Films from Templated $TiO_2$ and Structural Changes during their Thermal Treatment. Chem. Mater. 2008;20:2985-2993. https://doi.org/10.1021/cm071452e
  29. Yu J, Zhou M, Yu H, Zhang Q, Yu Y. Enhanced photoinduced super-hydrophilicity of the sol-gel-derived $TiO_2$ thin films by Fe-doping. Mater. Chem. Phys. 2006;95:193-196. https://doi.org/10.1016/j.matchemphys.2005.09.021
  30. Xu N, Shi Z, Fan Y,Dong J, Shi J, Hu MZC. Effects of Particle Size of $TiO_2$ on Photocatalytic Degradation of Methylene Blue in Aqueous Suspensions. Ind. Eng. Chem. Res. 1999;38:373-379. https://doi.org/10.1021/ie980378u
  31. Tsai M-C, Lee J-Y, Chen P-C, et al. Effects of size and shell thickness of $TiO_2$ hierarchical hollow spheres on photocatalytic behavior: An experimental and theoretical study. Appl. Catal. B, 2014;147:499-507. https://doi.org/10.1016/j.apcatb.2013.09.033
  32. Montazerozohori M, Nasr-Esfahani M, Joohari S, Photocatalytic degradation of an organic dye in some aqueous buffer solutions using nano titanium dioxide: a kinetic study. Environ. Prot. Eng. 2012;38:45-55.
  33. Velusamy P, Pitchaimuthu S, Rajalakshmi S, Kannan N. Modification of the photocatalytic activity of $TiO_2$ by $\beta$-Cyclodextrin in decoloration of ethyl violet dye. Journal of Advanced Research, 2014;5:19-25. https://doi.org/10.1016/j.jare.2012.10.001