Photocatalytic degradation of methyl orange:: Influence of H2O2 in the TiO2-based system

被引：19

作者：

Andronic, Luminita ^{[1
]}

Manolache, Simona ^{[1
]}

Duta, Anca ^{[1
]}

机构：

[1] Transilvania Univ Brasov, Ctr Prod Design Sustainable Dev, Brasov 500036, Romania

来源：

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY | 2008年 / 8卷 / 02期

关键词：

heterogeneous photocatalysis; titanium dioxide; doctor blade; spray pyrolysis deposition; methyl orange;

D O I：

10.1166/jnn.2008.C169

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The purpose of this study was to investigate the photocatalytic oxidation of a reactive azo dye. The photocatalytic activity of the TiO2 was studied using a reactor equipped with UV-A sources, with maximum emission at 365 nm. The photocatalytic activity of the TiO2 powder (99.9% anatase) and thin films has been measured through the decomposition of methyl orange solutions. The thin film was prepared by doctor blade and spray pyrolysis deposition (SPD). The TiO2 suspensions were prepared at 1 g/L concentration, and the initial methyl orange concentration was fixed at 7.8125 mg/L. The influence of the TiO2 (powder or thin films) and/or O-2 and H2O2 on the photo-bleaching rate, was tested under different experiments, at pH = 5. Thin films (doctor blade) of TiO2 formed of mezo-sized aggregates formed of nanosized anatase crystallites show better photo-bleaching efficiency than thin film (SPD) due to their large internal surface. The rate is even higher in H2O2 compared to oxygen environment.

引用

页码：728 / 732

页数：5

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