fulltext.study @t Gmail

Enhancing the H2 evolution from water–methanol solution using Mn2+–Mn+3–Mn4+ redox species of Mn-doped TiO2 sol–gel photocatalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
53674 46979 2016 8 PDF Available
Title
Enhancing the H2 evolution from water–methanol solution using Mn2+–Mn+3–Mn4+ redox species of Mn-doped TiO2 sol–gel photocatalysts
Abstract

•The Mn-doped TiO2 sol–gel photocatalysts were obtained.•The H2 evolution is improved by sacrificial molecule and Mn dopant in TiO2.•The Mn incorporation in TiO2 enhance the optical absorption in UV–vis region.•A mixture of oxidation states of Mn is obtained after calcination in air.•The role of manganese is decrease the electron–hole recombination.

Mn-doped TiO2 materials synthetized by the sol–gel method were obtained and tested in the photocatalytic hydrogen production from a methanol–water solution. The Mn amount was varied between 1.0–10.0%wt. Powder X-ray diffraction patterns and Raman spectra of the synthesized solids showed the anatase as the predominant crystalline phase. A high specific surface area was found in the Mn-doped sol–gel catalysts between 88–136 m2/g while in bare TiO2 sample 64 m2/g only. Mn-doped TiO2 solids evaluated in the production of H2 showed higher photoactivities (1376 μmol h−1 g−1 for 1.0%wt. Mn and 1736 μmol h−1g −1 for 5.0%wt. Mn) in comparison with the bare TiO2 semiconductor (264 μmol h−1g −1). This improvement in photoactivity is suggested as a combination of charge separators Mn2+, Mn3+ and Mn4+ which can act simultaneously as electron and hole traps respectively. The synergetic effect between the manganese oxidation states and electrons transferred from methanol toward TiO2 particles favored the H2 production.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (296 K)Download as PowerPoint slide

Keywords
Hydrogen production; Mn-doped titania; Mn-doped photocatalysts; Sol–gel TiO2; Mn charge separator; Manganese oxidation states
First Page Preview
Enhancing the H2 evolution from water–methanol solution using Mn2+–Mn+3–Mn4+ redox species of Mn-doped TiO2 sol–gel photocatalysts
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 266, 15 May 2016, Pages 9–16
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