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Enhanced photocatalytic degradation of dyes by TiO2 nanobelts with hierarchical structures

Paper ID Volume ID Publish Year Pages File Format Full-Text
27169 44006 2013 9 PDF Available
Title
Enhanced photocatalytic degradation of dyes by TiO2 nanobelts with hierarchical structures
Abstract

TiO2 nanobelt membranes with hierarchical structure were successfully synthesized by sequentially autoclaving Ti at 190 °C for 3 d in the presence of 10 M NaOH and 10 M KOH solutions. Microstructural characterization revealed TiO2 nanoparticles joining together and on the surface of nanobelts. These hierarchical structures form a three dimensional porous membrane which significantly enhances both surface specific area and light absorption, resulting in improved chemical adsorption capacity and photocatalytic degradation efficiency relative to nanobelts with smooth surfaces using methylene blue as a model molecule. The adsorption of methylene blue to these structures follows a pseudo-second order kinetics chemisorption mechanism with rate-limited diffusion correlated to pore structure and size. The dominant reactive oxygen species are identified as hydroxyl radicals and valence band holes through the scavenging reaction. The synergistic enhancement of filtration through surface adsorption and photocatalytic degradation is also demonstrated in a prototype photocatalytic membrane reactor with UV excitation at 365 nm. The reuse of nanobelt membranes after annealing shows the excellent recovery of TiO2 catalyst. These studies may contribute to additional applications of hierarchical TiO2 nanobelt membranes, including those harnessing sunlight for water treatment.

Graphical abstractHierarchical TiO2 nanobelt membranes for high efficient photocatalytic degradation.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A facile method to synthesize hierarchical TiO2 nanobelt membranes. ► Combine enhanced chemical adsorption and photocatalytic degradation. ► TiO2 nanobelt membranes are robust and reusable for methylene blue removal.

Keywords
TiO2 nanowires; Hierarchical structure; Surface adsorption; Photocatalytic degradation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 256, 15 March 2013, Pages 7–15
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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