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Isocyanate-modified TiO2 visible-light-activated photocatalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
48134 46494 2009 8 PDF Available
Title
Isocyanate-modified TiO2 visible-light-activated photocatalyst
Abstract

Visible-activated TiO2 photocatalysts were prepared by surface modification to TiO2 with different isocyanates, including conjugated structured Tolylene-2,4-diisocyanate (TDI) and unconjugated structured m-Xylylene diisocyanate (m-XDI). These two isocyanates could be anchored on the TiO2 surface via π-conjugated chemical bonds of –NHCOOTi, which were formed through the reaction between –NCO groups of isocyanates and the hydroxyl groups of TiO2, and confirmed by FT-IR, XPS and UV–Vis spectra. As a result, donor–acceptor type π-conjugated systems came into being between isocyanate and TiO2. Because the TDI molecules were conjugated themselves, perfect π-conjugated systems were produced in TDI-modified TiO2 samples. Nevertheless, m-XDI-modified TiO2 samples showed poor π-conjugation due to the lack of conjugation of m-XDI. Therefore, TDI-modified TiO2 materials exhibited stronger visible absorption than m-XDI-modified TiO2 in the range from 400 to 600 nm. Methylene blue, as a photodegradation target, was used to evaluate the photocatalytic performance, TDI-modified TiO2 materials exhibited higher photocatalytic activity than m-XDI-modified TiO2 and unmodified TiO2. Moreover, the higher dosage of isocyanate would lead to the better photocatalytic activity.

Keywords
Surface organic-modification; TiO2; Visible photocatalysis
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Isocyanate-modified TiO2 visible-light-activated photocatalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 88, Issues 1–2, 29 April 2009, Pages 165–172
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