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

Date

2019-03-01

Author

Erdogan, Nursev
PARK, JONGEE
Choi, Woohyuk
Kim, Soo Young
Öztürk, Abdullah

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

226
views

0
downloads

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.

Subject Keywords

General Materials Science, Bioengineering, General Chemistry, Condensed Matter Physics, Biomedical Engineering

URI

https://hdl.handle.net/11511/34983

Journal

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY

DOI

https://doi.org/10.1166/jnn.2019.16171

Collections

Department of Metallurgical and Materials Engineering, Article

Suggestions

OpenMETU
Core

B-N Polymer Embedded Iron(0) Nanoparticles as Highly Active and Long Lived Catalyst in the Dehydrogenation of Ammonia Borane Duman, Sibel; Metin, Onder; Özkar, Saim (American Scientific Publishers, 2013-07-01) B-N polymer embedded iron(0) nanoparticles (NPs) were in-situ generated from the reduction of iron(III) acetylacetonate during the dehydrogenation of ammonia borane (AB) in THF solution at 40.0 +/- 0.5 degrees C. The iron(0) NPs could be isolated as powder from the reaction solution by centrifugation and characterized by UV-Vis, TEM, and XRD. They are redispersible in polar solvent such as THF and yet highly active catalysts in the dehydrogenation of AB providing a TOF value of 202 h(-1) at 40.0 +/- 0.5 deg...
Hydrothermal synthesis of nanostructured TiO2 particles and characterization of their photocatalytic antimicrobial activity ERDURAL, Beril K.; YÜRÜM, Alp; BAKIR, Ufuk; Karakaş, Gürkan (American Scientific Publishers, 2008-02-01) Nanostructured titania particles were synthesized by using hydrothermal processing and the photocatalytic antimicrobial activities were characterized. Both sol-gel synthesized and commercial TiO2 (anatase) samples were processed with two step hydrothermal treatments, under alkaline and neutral conditions. Scanning Electron Microscope (SEM) images showed that alkaline treatment yields nanofibers and lamellar structured particles from the commercial anatase and sol-gel synthesized samples respectively. Furthe...
Characterization of iron oxide thin films prepared by sol-gel processing Karakuscu, Aylin; Ozenbas, Macit (American Scientific Publishers, 2008-02-01) Iron oxide thin films were prepared by spin-coating a gel solution of iron(III) nitrate dissolved in 2-methoxyethanol and acetylacetone on glass and quartz substrates. The film thickness was adjusted by changing the spinning rate of the spin coater, Annealing was carried out between 300 degrees C to 600 degrees C to investigate the phases present in the films. Viscosity of the main solution was found as 0.0035 Pa (.) s by viscosity measurement. TGA/DTA analyses showed that heat treatment should be done betw...
Synthesis of aromatic poly(pyridinium salt)s and their electrochromic properties Keshtov, M. L.; UDUM, YASEMİN; Toppare, Levent Kamil; Kochurov, V. S.; Khokhlov, A. R. (Elsevier BV, 2013-05-15) Synthesis of a series of new conjugated electrochromic polymeric pyridinium salts containing main-chain triphenylamine and their electrochromic properties were demonstrated. All polymers exhibit intense UV absorptions at 336-338 nm in DMF and 340-343 nm in thin film form and fluorescence centered at 410-438 nm in DMF and 460-461 nm in thin film form. The electrochromic properties of the films were investigated by electrochemical and spectroelectrochemical methods. Reversible redox signals with stable electr...
Nanoceria-Supported Ruthenium(0) Nanoparticles: Highly Active and Stable Catalysts for Hydrogen Evolution from Water Demir Arabacı, Elif; Önal, Ahmet Muhtar (American Chemical Society (ACS), 2018-02-21) Ruthenium(0) nanoparticles supported on nanoceria (Ru-0/CeO2) were prepared by reduction of Ru3+ ions on the surface of ceria using aqueous solution of NaBH4. The Ru-0/CeO2 samples were characterized by advanced analytical tools and employed as electrocatalysts on the glassy carbon electrode (GCE) in hydrogen evolution from water. The GCE, modified by Ru-0/CeO2 (1.86 wt % Ru), provides an incredible electrocatalytic activity with a high exchange current density of 0.67 mA.cm(-2), low overpotential of 47 mV ...

Citation Formats

N. Erdogan, J. PARK, W. Choi, S. Y. Kim, and A. Öztürk, “Alkaline Hydrothermal Synthesis, Characterization, and Photocatalytic Activity of TiO2 Nanostructures: The Effect of Initial TiO2 Phase,” JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, pp. 1511–1519, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/34983.