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Visible light-activated N-F-codoped TiO2 nanoparticles for the photocatalytic degradation of microcystin-LR in water

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Abstract.
In this study, we developed nonmetal-doped TiO2 nanoparticles (N-F-TiO2) by a novel synthesis route
employing a simple sol–gel method containing a nonionic fluorosurfactant as pore template material to
tailor-design the structural properties of TiO2 and fluorine dopant as well as ethylenediamine as nitrogen
source for the photocatalytic response towards visible light. The synthesized photocatalyst was
characterized by XRD, UV–vis spectroscopy, XPS, HR-TEM, ESEM and porosimetry measurements. The
resulting nanoparticles exhibited enhanced structural properties such as high surface area (141 m2/g),
high porosity (49%), mesoporous structure (2–10 nm pore size) and low degree of agglomeration (1.07).
A reduction in the effective band gap (2.75 eV) was observed compared with reference TiO2 (3.00 eV) due
to the red-shift in the optical absorption spectrum of the nonmetal-doped TiO2 photocatalyst. We also
focused on the environmental application of the prepared nanoparticles for the destruction of
microcystin-LR (MC-LR) under visible light irradiation (y > 420 nm). Under acidic conditions (pH
3.0 + 0.1), the highest MC-LR degradation rate was achieved with N-F-TiO2. The electrostatic interactions
between the toxin and the N-F-codoped TiO2 favored the photocatalytic degradation. Beneficial effects
induced by codoping with nitrogen and fluorine are responsible for higher photocatalytic activity than TiO2
nanoparticles with only fluorine or nitrogen doping. Also, commercially available visible light-activated TiO2 showed lower degradation rate per unit surface area of the material.

Keywords:
Visible light
Microcystin-LR
Titanium dioxide
Photocatalysis
Fluorine doping
Nitrogen doping
Sol–gel method

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Informasi Detail

Judul Seri

Catalysis Today

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Catalysis Today 144 (2009) 19–25

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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