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Study of COD Removal Efficiency from Synthetic Wastewater by Photocatalytic Process
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  • Journal title : Environmental Engineering Research
  • Volume 19, Issue 3,  2014, pp.255-259
  • Publisher : Korean Society of Environmental Engineering
  • DOI : 10.4491/eer.2014.S1.002
 Title & Authors
Study of COD Removal Efficiency from Synthetic Wastewater by Photocatalytic Process
Rojviroon, Orawan; Rojviroon, Thammasak; Sirivithayapakorn, Sanya;
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 Abstract
In this research, we compared the COD removal efficiencies of titanium dioxide () 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 thin films consisted of pure anatase crystalline structure with grain sizes in the range 20-250 nm. The calculated optical band gaps of the thin films were 3.24. The total apparent surface area per total weight of thin films were 4.74, 3.86 and 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 thin films at 3 layers coating was , while for the 4 layers coating and the 5 layers coating were and , 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.
 Keywords
Kinetic;Nano-sized ;Sol-gel;Thin film;Wastewater treatment;
 Language
English
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