Alkaline Hydrothermal Synthesis, Characterization, and Photocatalytic Activity of TiO2 Nanostructures: The Effect of Initial TiO2 Phase

Erdogan N., PARK J., Choi W., Kim S. Y., ÖZTÜRK A.

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, cilt.19, sa.3, ss.1511-1519, 2019 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 19 Sayı: 3
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1166/jnn.2019.16171
  • Dergi Adı: JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED)
  • Sayfa Sayıları: ss.1511-1519
  • Anahtar Kelimeler: TiO2, Hydrothermal Process, 1D Structure, Nanoribbons, Photocatalytic Activity, TITANATE NANOSHEETS, NANOTUBES, DYES
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

One-dimensional (1D) titanate nanostructures were synthesized by hydrothermal route, using commercially available TiO2 (P25) and anatase powders as precursor materials and strong NaOH solution as catalyzer. The prepared titanates were calcined, followed by protonation to produce TiO2 nanostructures having enhanced photocatalytic and photovoltaic properties. The synthesized TiO2 1D nanostructures were characterized using field-emission scanning electron microscope, high-resolution electron microscope, X-ray diffraction analysis, and UV-Vis photospectroscopy to understand the effect of initial TiO2 phase on morphological and crystallographic features, and bandgap. Methylene blue degradation test was applied to evaluate the photoactivity of the products obtained after different stages of the process. The findings indicate that 1D TiO2 nanostructures form by different mechanisms from dissolved aggregates during hydrothermal process, depending on the crystal structure of the initial precursor used. Photocatalytic test results reveal that protonated titanates have considerable adsorption capability, while photocatalytic degradation depends on TiO2 transformation.