e-journal

Isocyanate-modified TiO2 visible-light-activated photocatalyst

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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 p-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 p-conjugated systems came into being between
isocyanate and TiO2. Because the TDI molecules were conjugated themselves, perfect n-conjugated
systems were produced in TDI-modified TiO2 samples. Nevertheless, m-XDI-modified TiO2 samples
showed poor n-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-XDImodified
TiO2 and unmodified TiO2.Moreover, the higher dosage of isocyanatewould lead to the better
photocatalytic activity.

Keywords: Surface organic-modification, TiO2, Visible photocatalysis

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Informasi Detail

Judul Seri

Applied Catalysis B: Environmental

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Applied Catalysis B: Environmental 88 (2009) 165–172

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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