New insights into self-modification of mesoporous titania nanoparticles for enhanced photoactivity: effect of microwave power density on formation of oxygen vacancies and Ti3+ defects
作者： Nur Farhana Jaafar , Aishah Abdul Jalil , Sugeng Triwahyono , N Shamsuddin
DOI: 10.1039/C5RA15120A
关键词: Nanoparticle 、 Crystallinity 、 Adsorption 、 Band gap 、 Visible spectrum 、 Nanotechnology 、 Power density 、 Charge carrier 、 Materials science 、 Catalysis 、 Chemical engineering
摘要: Mesoporous titania nanoparticles (MTN) were successfully prepared by a microwave (MW)-assisted method under various power densities. The catalysts characterized XRD, FT-IR, surface area analysis, TEM, and ESR. characterization data indicated that higher density increased the crystallinity of MTN while decreasing particle size band-gap energy TiO2. Significantly, MW heating played an important role in formation oxygen vacancies (OV) Ti3+ site defects (TSD). (T1–T3) with 0.12, 0.37, 0.56 W g−1 found to degrade 84%, 88%, 96% 2-chlorophenol (2-CP) visible light, respectively, compared 69% commercial Besides narrowing band gap, OV TSD also acted as electron acceptors hindered electron–hole recombination, well facilitated charge carrier migration. kinetics study over T3 showed adsorption was controlling step 2-CP degradation, which followed pseudo-first-order Langmuir–Hinshelwood model. photocatalytic reaction still stable, even after five cycle runs without severe catalyst deactivation. This demonstrates uniform heat distribution provided is able produce are rich effective light irradiation.
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