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Exploring the relationship between surface structure and photocatalytic activity of flame-made TiO2-based catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
46554 46441 2012 8 PDF Available
Title
Exploring the relationship between surface structure and photocatalytic activity of flame-made TiO2-based catalysts
Abstract

Bare titanium dioxides (TiO2) and doped with metal (Cu) or non-metal ion (F) were synthesized by a single-step flame spray pyrolysis (FSP) method. According to the BET, XRD, and TEM results, the Cu- and F-doped TiO2 nanoparticles synthesized by FSP possess comparable features in terms of surface area, crystallite size and phase composition, and morphology. However, the F-doped TiO2 exhibited the highest photocatalytic activity for the complete oxidation of acetaldehyde (ACE) even surpassing benchmarking Aeroxide TiO2 (P25). In contrast, Cu-doped TiO2 had a detrimental effect on the ACE photocatalytic oxidation. The proportion of native terminal hydroxyl groups, evaluated using high-field 1H MAS NMR, on the particle surface was varied by doping the TiO2 with either Cu or F ions during FSP synthesis. A relationship, whereby decreased terminal hydroxyl group content corresponded to elevated acetaldehyde photodegradation, was subsequently uncovered. The findings were reinforced by studying the XPS O 1s photopeaks in the region attributed to surface hydroxyl groups.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights▸ TiO2-based nanoparticles were controllably synthesized by one-step flame spray pyrolysis. ▸ Cu- or F-TiO2 gave comparable textural and morphological properties. ▸ Surface hydroxyl groups on the TiO2 play a key role in defining their activity. ▸ Low terminal hydroxyl group content is congruent with a high photocatalytic activity.

Keywords
Photodegradation; Acetaldehyde; Titanium dioxide; Dopants; Flame spray pyrolysis; Surface hydroxyl groups; 1H MAS NMR
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Exploring the relationship between surface structure and photocatalytic activity of flame-made TiO2-based catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 126, 25 September 2012, Pages 290–297
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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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