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Characterization and photocatalytic activity of noble-metal-supported surface TiO2/SiO2

Characterization and photocatalytic activity of noble-metal-supported surface TiO2/SiO2
Characterization and photocatalytic activity of noble-metal-supported surface TiO2/SiO2
M-TiO2/SiO2 photocatalysts were prepared by the photodeposition method using noble-metal salts (M: Pt4+, Pd2+, and Ag+) as precursors and the surface bond-conjugated TiO2/SiO2 as supporter in N2 atmosphere. The photocatalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflection spectra (DRS), photoluminescence (PL) spectra, and zeta-potential. Their photocatalytic activities were evaluated using reactive Brilliant Red K-2G (K-2G) and Cationic Blue X-GRL (CBX) that showed different types of adsorption behavior on the oxides. XPS analysis verified that the introduction of noble metal led to the changes of the electronic environmental of Ti cations and the zeta-potential of oxides. As a result, K-2G has higher adsorption on Pt-TiO2/SiO2 than on TiO2/SiO2, while the adsorption of CBX has little change on the modified TiO2/SiO2 catalysts. At the same time, Pt-modified catalyst shows 2.8 times higher photoactivity than TiO2/SiO2 for the photodegradation of K-2G, but has a decrease in activity for CBX degradation. These noble-metal-supported TiO2/SiO2 can efficiently extend the light absorption to the visible region. The PL results demonstrated that the noble metal dopant acted as electron acceptor to hinder the recombination of the photoinduced electron–hole pairs.
azo dyes, adsorption, noble metal, surface modification, titania/silica
0926-860X
389-396
Hu, Chun
64ad5d38-5768-480a-97a0-739cab58f4c0
Tang, Yuchao
60b60362-b5c2-46d5-bfe9-cbd5d6b343c7
Jiang, Zheng
bcf19e78-f5c3-48e6-802b-fe77bd12deab
Hao, Zhengping
ddb48896-0a13-41b1-9eb0-bc7ec1c4cdec
Tang, Hongxiao
bd12f88c-6393-412b-8140-5078819ab1c9
Wong, Po Keung
f0a73d3e-c81c-479b-aff8-d71a4e89ec80
Hu, Chun
64ad5d38-5768-480a-97a0-739cab58f4c0
Tang, Yuchao
60b60362-b5c2-46d5-bfe9-cbd5d6b343c7
Jiang, Zheng
bcf19e78-f5c3-48e6-802b-fe77bd12deab
Hao, Zhengping
ddb48896-0a13-41b1-9eb0-bc7ec1c4cdec
Tang, Hongxiao
bd12f88c-6393-412b-8140-5078819ab1c9
Wong, Po Keung
f0a73d3e-c81c-479b-aff8-d71a4e89ec80

Hu, Chun, Tang, Yuchao, Jiang, Zheng, Hao, Zhengping, Tang, Hongxiao and Wong, Po Keung (2003) Characterization and photocatalytic activity of noble-metal-supported surface TiO2/SiO2. Applied Catalysis A: General, 253 (2), 389-396.

Record type: Article

Abstract

M-TiO2/SiO2 photocatalysts were prepared by the photodeposition method using noble-metal salts (M: Pt4+, Pd2+, and Ag+) as precursors and the surface bond-conjugated TiO2/SiO2 as supporter in N2 atmosphere. The photocatalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflection spectra (DRS), photoluminescence (PL) spectra, and zeta-potential. Their photocatalytic activities were evaluated using reactive Brilliant Red K-2G (K-2G) and Cationic Blue X-GRL (CBX) that showed different types of adsorption behavior on the oxides. XPS analysis verified that the introduction of noble metal led to the changes of the electronic environmental of Ti cations and the zeta-potential of oxides. As a result, K-2G has higher adsorption on Pt-TiO2/SiO2 than on TiO2/SiO2, while the adsorption of CBX has little change on the modified TiO2/SiO2 catalysts. At the same time, Pt-modified catalyst shows 2.8 times higher photoactivity than TiO2/SiO2 for the photodegradation of K-2G, but has a decrease in activity for CBX degradation. These noble-metal-supported TiO2/SiO2 can efficiently extend the light absorption to the visible region. The PL results demonstrated that the noble metal dopant acted as electron acceptor to hinder the recombination of the photoinduced electron–hole pairs.

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Published date: October 2003
Keywords: azo dyes, adsorption, noble metal, surface modification, titania/silica
Organisations: Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 352776
URI: http://eprints.soton.ac.uk/id/eprint/352776
ISSN: 0926-860X
PURE UUID: 0c5a0040-6e78-435e-be04-3be551a93a5d
ORCID for Zheng Jiang: ORCID iD orcid.org/0000-0002-7972-6175

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Date deposited: 10 Jun 2013 13:49
Last modified: 10 Dec 2019 01:35

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Contributors

Author: Chun Hu
Author: Yuchao Tang
Author: Zheng Jiang ORCID iD
Author: Zhengping Hao
Author: Hongxiao Tang
Author: Po Keung Wong

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