SYNTHESIS AND CHARACTERIZATION OF TiO2 FOR PHOTOCATALYTIC DEGRADATION OF METHYLENE BLUE
Main Article Content
Abstract
Background: Photocatalytic technology using TiO2 Nanowires on TiO2 Nanotubes Arrays (TNWs/TNAs) grown directly on a titanium substrate is believed to have high efficiency in the photodegradation of methylene blue - a harmful agent causing water pollution and posing risks to human health. Objectives: 1) To synthesize TiO2 Nanowires on TiO2 Nanotubes Arrays by the anodization method; 2) To investigate the properties of TNWs/TNAs during the photocatalytic degradation of methylene blue (morphology, chemical composition, and reusability of TNWs/TNAs). Material and methods: TNWs/TNAs were synthesized using the anodization method. The material's properties were characterized using X-ray Diffraction (XRD) with Cu Kα radiation (λ= 1.5406 Å) and the Scherrer formula, Scanning Electron Microscopy (SEM, JEOL JSM-6500), and EnergyDispersive X-ray Spectroscopy (EDS) equipped on the SEM. The stability of the TiO2-based material was evaluated in the photocatalytic degradation of methylene blue after 5 usage cycles, based on the Langmuir-Hinshelwood kinetic model after 2 hours of UV irradiation. Results: Pure anatase phase TNWs/TNAs was successfully synthesized (crystallite size ~ 28.12 nm). The TNWs/TNAs structure (diameter ~ 124.55 nm, film thickness ~ 4.8 µm) remained stable after the photocatalytic process. The methylene blue degradation efficiency reached approximately 59% after 2 hours of UV irradiation, and the reaction rate constant maintained about 94.4% of its initial value after 5 cycles. Conclusion: The synthesized TNWs/TNAs possesses a durable structure and exhibits stable photocatalytic efficiency in the degradation of methylene blue.
Keywords
TiO2, TNWs/TNAs, photocatalysis
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