Research Article
Photocatalytic Activity of Toluene under UV-LED Light with TiO2 Thin Films
Table 1
Surface properties of dip-coated TiO2 thin films on stainless steel substrates.
| Surface properties | | Catalysts | | TiO2 | 0.3% Fe-TiO2 | 0.5% Fe-TiO2 | 0.7% Fe-TiO2 |
| Crystalline phase | Anatase | Anatase | Anatase | Anatase | Optical band gap (eV) | 3.27 | 3.28 | 3.22 | 2.82 | Grain size (nm) | 20–250 | 20–150 | 50–180 | 30–100 | RMS average roughnesses (nm) | 18.30 | 11.92 | 18.40 | 12.92 | Apparent surface area (m2 m−2) (1) | 1.08 | 1.06 | 1.11 | 1.09 | Total weight of TiO2 on substrate (g m−2) (2) | 0.15 | 0.15 | 0.15 | 0.14 | Total apparent surface area per total weight of TiO2 (m2 g−1) (3) = (1)/(2) | 7.13 | 7.07 | 7.66 | 7.81 | BET surface area (m2 g−1) | 36.98 | 21.61 | 32.57 | 42.73 | Adherence | | | | | Classification | 4B | 4B | 4B | 4B | Rank | Good | Good | Good | Good | Corrosion test | ✓ | ✓ | ✓ | ✓ |
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✓: no visible damage.
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