Enhancement of photocatalytic performance in degradation of aqueous trichloroethylene and methylene blue by using TiO_2 thin film fabricated by cellulose nanocrystals templating and Nb doping

Fe–doped titanium dioxide–carbonized medium–density fiberboard (Fe/TiO2–cMDF) was evaluated for the photodegradation of methylene blue (MB) under a Blue (450 nm) light emitting diode (LED) module (6 W) and commercial LED (450 nm + 570 nm) bulbs (8 W, 12 W). Adsorption under daylight/dark conditions (three cycles each) and photodegradation (five cycles) were separately conducted. Photodegradation under Blue LED followed pseudo-second-order kinetics while photodegradation under commercial LED bulbs followed pseudo-first-order kinetics. Photodegradation rate constants were corrected by subtracting the adsorption rate constant except on the Blue LED experiment due to their difference in kinetics. For 8 W LED, the rate constants remained consistent at ~11.0 × 10−3/h. For 12 W LED, the rate constant for the first cycle was found to have the fastest photodegradation performance at 41.4 × 10−3/h. After the first cycle, the rate constants for the second to fifth cycle remained consistent at ~28.5 × 10−3/h. The energy supplied by Blue LED or commercial LEDs was sufficient for the bandgap energy requirement of Fe/TiO2–cMDF at 2.60 eV. Consequently, Fe/TiO2–cMDF was considered as a potential wood-based composite for the continuous treatment of dye wastewater under visible light.

Fe-Doped TiO2-Carbonized Medium-Density Fiberboard for Photodegradation of Methylene Blue under Visible Light.

TiO2-carbonized medium-density fiberboard (TiO2-cMDF), prepared by carbonization of MDF treated with 50% (v/v) titanium tetraisopropoxide (Ti-tip) in isopropyl alcohol (IPA) as a precursor, was investigated for adsorption and photodegradation in aqueous methylene blue (MB) solution under UV-C (254 nm) irradiation. After full adsorption of MB, four successive cycles of photodegradation were conducted. After the second cycle, the TiO2-cMDF was rinsed with water, dried, and subjected to photodegradation again. For every photodegradation cycle, the TiO2-cMDF practically removed MB. The photodegradation results of the second (unrinsed) and third (rinsed) cycle were similar, however, the result of the fourth (rinsed) cycle was lower than the third cycle. The rate constant of adsorption was 3.3 × 10–3/h and followed pseudo-first-order kinetics. The rate constant of photodegradation decreased from 11.0 × 10–3/h (first cycle) to 5.9 × 10–3/h (fourth cycle) and likewise followed pseudo-first-order kinetics. A reduction in Ti content on the surface of TiO2-cMDF was observed after photodegradation based on scanning electron microscope-energy dispersive X-ray spectrometer (SEM–EDS) analysis; nonetheless, photodegradation of MB was still accomplished. Although TiO2-cMDF in aqueous system exhibited slow photodegradation, it is due to the limited number of TiO2-cMDF slabs. The number of slabs must be increased to improve the photocatalytic performance.

TiO2-carbonized medium-density fiberboard for the photodegradation of methylene blue

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TiO2-carbonized medium-density fiberboard for the photodegradation of methylene blue