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Journals / Journal of the Turkish Chemical Society Section A: Chemistry / 2018 / Cilt: 5 - Sayı: 1

EFFECT OF ANNEALING TEMPERATURES ON THE CRYSTALLIZATION AND PHOTOCATALYTIC ACTIVITY OF MICRO-NANOPOROUS TiO2 FILMS PRODUCED BY ELECTROCHEMICAL ANODIZATION

Melis Yurddaskal
Metin Yurddaskal
Tuncay Dikici
Hülya Durmuş
Pages
85–92
Publication Date
2017-12-15
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

XRD results indicated that at annealing temperatures higher than 600°C, anatase started to transform into rutile.

📌 3 Key Takeaways

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Objective & Hypothesis:In this study, micro-nanoporous TiO2 films were prepared by electrochemical anodization of titanium (Gr-2) in an aqueous solution containing 0.5 wt. % HF solution at a constant potential of 30 V and then annealed in ambient air at 500, 600, 700 and 800 °C for 2 h to obtain crystalline structures.
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Key Findings & Data:The photocatalytic performances of the samples were evaluated by the photocatalytic degradation of aqueous methylene blue (MB) solutions under UV light illumination for different periods.
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Conclusion & Impact:XRD results indicated that at annealing temperatures higher than 600°C, anatase started to transform into rutile.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Nanostructured TiO2 · anatase · surface morphology

Abstract

In this study, micro-nanoporous TiO2 films were prepared by electrochemical anodization of titanium (Gr-2) in an aqueous solution containing 0.5 wt. % HF solution at a constant potential of 30 V and then annealed in ambient air at 500, 600, 700 and 800 °C for 2 h to obtain crystalline structures. The crystalline phase and surface morphology of the samples were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The photocatalytic performances of the samples were evaluated by the photocatalytic degradation of aqueous methylene blue (MB) solutions under UV light illumination for different periods. XRD results indicated that at annealing temperatures higher than 600°C, anatase started to transform into rutile. Increasing annealing temperatures resulted in reduced micro-nanopores diameter and increased wall thickness. At 800°C, the structure completely disappeared. The results demonstrated that changes in both the crystalline structure and surface morphology have a strong influence on the photoactivity of the nanostructured TiO2 films.

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Cite This Article

Yurddaskal, M., Yurddaskal, M., Dikici, T., Durmuş, H. (2017). EFFECT OF ANNEALING TEMPERATURES ON THE CRYSTALLIZATION AND PHOTOCATALYTIC ACTIVITY OF MICRO-NANOPOROUS TiO2 FILMS PRODUCED BY ELECTROCHEMICAL ANODIZATION. Journal of the Turkish Chemical Society Section A: Chemistry, Cilt: 5 - Sayı: 1, 85–92. https://ajindex.com/articles/781456

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