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Photocatalytic Activity of TiO2 Thin Films: Kinetic and Efficiency Study

  • Ivana Grčić EMAIL logo , Sanja Papić and Ivan Brnardić
Published/Copyright: March 23, 2017
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International Journal of Chemical Reactor Engineering
From the journal International Journal of Chemical Reactor Engineering Volume 16 Issue 1

Abstract

The aim of this work was to evaluate the photocatalytic activity of two distinct anatase thin films. Films were prepared following the sol-gel procedure from titanium (IV) isopropoxide (TF-1) and from commercial TiO2 P25 as a starting material (TF-2). The films were compared based on the salicylic acid (2-dihydroxybenzoic acid, 2-HBA) photocatalytic degradation in reactors of different geometry and under different irradiation conditions. Experiments were performed in (i) an annular photoreactors operated under turbulent flow (TAR1 and TAR2) and (ii) semi-annular reactor operated under laminar flow (LFR). The TF-1 and TF-2 were immobilized on the inner side of outer wall of TAR1 and TAR2 and on the bottom of LFR. Experimental study included sorption study and four consecutive photocatalytic runs (tirr= 8 h) using TF-1 and TF-2 in each reactor. Obtained results confirmed the stability and the similar photocatalytic activity of the both films. The 2,5-dihydroxybenzoic acid (2,5-DHBA) and 2,3-dihydroxybenzoic acid (2,3-DHBA) were identified as main 2-HBA degradation by-products. Kinetic models were developed accordingly. Incident photon flux was determined along the inner reactor wall in annular reactors and on the bottom of LFR, i. e. on the thin film surface (Itf, W m−2) using ESSDE radiation emission model. The irradiation factor, i. e. the product of absorption coefficient and incident photon flux at film surface (μItf(z))m was introduced into the kinetic models. Resulting reaction rate constants ki (min−1W−0.5 m1.5) were independent of reactor geometry, hydrodynamics, irradiation condition and the optical properties of thin films. Efficiencies of TF-1 and TF-2 in studied reactors were given on the basis of quantum yields (QY) for 2-HBA oxidation and overall mineralization toward CO2.

Keywords: sol-gel; TiO2 thin film; salicylic acid; degradation kinetics; photocatalytic quantum yield

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Published Online: 2017-3-23

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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  2. Role of Different Feedstocks on the Butanol Production Through Microbial and Catalytic Routes
  3. Research Articles
  4. Experimental Study of Batch Reactor Performance for Ethyl Acetate Saponification
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https://doi.org/10.1515/ijcre-2016-0153
Keywords for this article
sol-gel; TiO2 thin film; salicylic acid; degradation kinetics; photocatalytic quantum yield

Articles in the same Issue

  1. Review
  2. Role of Different Feedstocks on the Butanol Production Through Microbial and Catalytic Routes
  3. Research Articles
  4. Experimental Study of Batch Reactor Performance for Ethyl Acetate Saponification
  5. Photocatalytic Activity of TiO2 Thin Films: Kinetic and Efficiency Study
  6. Experimental and Modeling Assessment of Sulfate and Arsenic Removal from Mining Wastewater by Nanofiltration
  7. CFD-DEM Numerical Simulation and Experimental Validation of Heat Transfer and Two-Component Flow in Fluidized Bed
  8. Numerical and Experimental Study on a Microfluidic Concentration Gradient Generator for Arbitrary Approximate Linear and Quadratic Concentration Curve Output
  9. Zn2+, Fe2+, Cu2+, Mn2+, H+ Ion-exchanged and Raw Clinoptilolite Zeolite Catalytic Performance in the Propane-SCR-NOx Process: A Comparative Study
  10. Adsorption of Congo Red Dye from Aqueous Solutions by Montmorillonite as a Low-cost Adsorbent
  11. Modeling and Evaluating Zeolite and Amorphous Based Catalysts in Vacuum Gas Oil Hydrocracking Process
  12. Short Communication
  13. The Possibility of Hybrid-Bioreactor Heating by the Microwave Radiation
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