fulltext.study @t Gmail

Ti3+ self-doped TiO2−x anatase nanoparticles via oxidation of TiH2 in H2O2

Paper ID Volume ID Publish Year Pages File Format Full-Text
54289 47004 2014 10 PDF Available
Title
Ti3+ self-doped TiO2−x anatase nanoparticles via oxidation of TiH2 in H2O2
Abstract

•TiH2 and H2O2 were used as the precursor for prepared Ti3+ self-doped TiO2−x.•Ti3+ and oxygen vacancies exist in the bulk and surface of TiO2−xnanoparticles.•The sample exhibits higher photocatalytic degradation of methylene blue.•The sample exhibits higher photocatalytic activity for hydrogen evolution.

Anatase phase Ti3+ self-doped TiO2−x nanoparticles (NPs) has been successfully synthesized by a simple interface ion diffusion-redox reaction using TiH2 and H2O2 as precursors. The structure, crystallinity, morphology and other properties of the samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). The chemical states of Ti in the samples were confirmed by X-ray photoelectron spectra (XPS). Electron spin resonance (ESR) spectra confirm the presence of high concentration of Ti3+ in the bulk and surface of the as-prepared substoichiometric TiO2−x NPs. Composition of the samples was also analyzed by energy dispersive X-ray spectra (EDX) and the results indicate the exist of oxygen vacancies. UV–vis diffuse reflectance spectroscopy (UV–vis DRS) showed that Ti3+ self-doped TiO2−x NPs have a strong absorption between 400 and 800 nm. The formation mechanism of the Ti3+ self-doped TiO2−x NPs was also discussed. Methylene blue (MB) solutions were used as model wastewater to evaluate the visible-light photocatalytic activity of the samples. Under visible light radiation, the samples exhibit excellent ability in the photocatalytic degradation of MB and splitting of water to produce H2. The most active Ti3+ self-doped TiO2−x NPs obtained at 500 °C exhibits 68-fold enhancement for the visible light decomposition of MB in comparison to commercial P25 TiO2. The samples also show an excellent cyclic stability of the photocatalytic activity of degrading MB.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (226 K)Download as PowerPoint slide

Keywords
Ti3+ self-doped TiO2; Visible light photocatalytic; TiH2; Interface ion diffusion-redox reaction
First Page Preview
Ti3+ self-doped TiO2−x anatase nanoparticles via oxidation of TiH2 in H2O2
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 225, 15 April 2014, Pages 80–89
Authors
, , , , , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us