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Photocatalytic hydrogen evolution over SiO2-pillared and nitrogen-doped titanic acid under visible light irradiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
41541 45892 2010 6 PDF Available
Title
Photocatalytic hydrogen evolution over SiO2-pillared and nitrogen-doped titanic acid under visible light irradiation
Abstract

Silica-pillared and non-pillared H2Ti4O9 samples were doped with nitrogen from urea as a nitrogen precursor for visible light photocatalysis. The photocatalytic activities of the nitrogen-doped samples were evaluated for hydrogen evolution from aqueous methanol solution. Techniques such as XRD, FT-IR, TG-DSC, SEM, XPS, and UV–visible diffuse reflectance spectroscopy were adopted to explore the characteristics of the materials. The silica-pillared H2Ti4O9 sample is more stable than the non-pillared one, and its layered structure was retained well at temperatures up to 500 °C. The interlayer spacing of H2Ti4O9 was expanded from 2.7 Å to 7.2 Å after being pillared with silica. Silica pillaring could have a profound impact on nitrogen doping and the resultant photocatalytic activity. The interlayer spacing of the silica-pillared H2Ti4O9 did not change after nitrogen doping; in contrast, that of the non-pillared H2Ti4O9 was reduced by 44% after the same doping process, despite the fact that the non-pillared sample showed better nitrogen doping properties. With expanded interlayer spacing and better retained layered structure, the silica-pillared and nitrogen-doped H2Ti4O9 performed much better than the non-pillared counterpart for hydrogen evolution under visible light irradiation.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (92 K)Download as PowerPoint slideResearch highlights▶ Silica-pillared and non-pillared H2Ti4O9 samples were doped with nitrogen for visible light photocatalysis. ▶ SiO2–H2Ti4O9–N has expanded interlayer spacing and better retained layered structure than H2Ti4O9–N. ▶ The SiO2–H2Ti4O9–N sample showed much higher photocatalytic activity for H2 evolution than non-pillared H2Ti4O9–N.

Keywords
Photocatalysis; Visible light; Titanic acid; Nitrogen doping; Hydrogen evolution
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Photocatalytic hydrogen evolution over SiO2-pillared and nitrogen-doped titanic acid under visible light irradiation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 390, Issues 1–2, 20 December 2010, Pages 195–200
Authors
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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