Tungstophosphoric acid supported on polycrystalline TiO2 for the photodegradation of 4-nitrophenol in aqueous solution and propan-2-ol in vapour phase

被引：40

作者：

Carriazo, Daniel ^{[1
]}

Addamo, Maurizio ^{[2
]}

Marci, Giuseppe ^{[2
]}

Martin, Cristina ^{[1
]}

Palmisano, Leonardo ^{[2
]}

Rives, Vicente ^{[1
]}

机构：

[1] Univ Salamanca, Dept Quim Inorgan, GIR QUESCAT, E-37008 Salamanca, Spain

[2] Univ Palermo, Dipartimento Ingn Chim Proc & Mat, Schiavello Grillone Photocatalysis Grp, I-90128 Palermo, Italy

来源：

APPLIED CATALYSIS A-GENERAL | 2009年 / 356卷 / 02期

关键词：

Photocatalysis; Titania; Polyoxometalate; Surface acidity; PHOTOCATALYTIC DEGRADATION; TITANIUM-DIOXIDE; HETEROGENEOUS PHOTOCATALYSIS; 12-TUNGSTOPHOSPHORIC ACID; DYE POLLUTANTS; METAL-IONS; SURFACE; POLYOXOMETALATE; OXIDATION; SYSTEMS;

D O I：

10.1016/j.apcata.2009.01.010

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The present work reports the preparation of samples based on Millennium PC-500 TiO2 loaded with different amounts of tungstophosphoric acid (up to 30% in weight) and their characterisation by means of different physicochemical techniques: powder X-ray diffraction, N-2 adsorption-desorption at -196 degrees C, transmission electron microscopy, UV-vis and FT-IR spectroscopies and thermogravimetric analyses. The acidity of samples was evaluated by FTIR using pyridine as probe molecule, and the catalysts activity was tested for the photodegradation of 4-nitrophenol in aqueous solution and for the photo-oxidation of propan-2-ol in vapour phase. The results show a noticeable improvement (8 and 2.5 times faster in the photodegradation rate of 4-nitrophenol and propan-2-ol, respectively), in both regimes for these specific substrates, when tungstophosphoric acid is dispersed over the oxide up to a certain amount (20% in weight). A partial leaching of the polyoxometalate was also detected in solution for samples loaded with the largest amounts on this compound. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：172 / 179

页数：8

共 43 条

[1] PMMA-based composite materials with reactive ceramic fillers .1. Chemical modification and characterisation of ceramic particles [J].