Photocatalytic decolorization of methylene blue in the presence of TiO2/ZnS nanocomposites

被引：202

作者：

Franco, A. ^{[1
,2
]}

Neves, M. C. ^{[3
]}

Ribeiro Carrott, M. M. L. ^{[4
]}

Mendonca, M. H. ^{[1
,2
]}

Pereira, M. I. ^{[1
,2
]}

Monteiro, O. C. ^{[1
,2
]}

机构：

[1] Univ Lisbon, CCMM, P-1749016 Lisbon, Portugal

[2] Univ Lisbon, Dept Chem & Biochem, P-1749016 Lisbon, Portugal

[3] Univ Aveiro, Dept Chem, CICECO, P-3810193 Aveiro, Portugal

[4] Univ Evora, Colegio LA Verney, Dept Chem, CQE, P-7000671 Evora, Portugal

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2009年 / 161卷 / 01期

关键词：

TiO2; Methylene blue; Decolorization; Photocatalysis; TiO2/ZnS nanocomposites; DEGRADATION; PHOTODEGRADATION; DECOMPOSITION; NANOPARTICLES; SPHERES; DYES;

D O I：

10.1016/j.jhazmat.2008.03.133

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The synthesis of distinct nanocrystalline TiO2 capped ZnS samples was carried out using a chemical deposition method. The materials characterization showed that the presence of ZnS onto TiO2 surface results in a red shift of the material band edge when compared with the initial semiconductor The photocatalytic activity of the prepared nanocomposites was tested on the decolorization of methylene blue (MB) aqueous solutions. The dye photodecolorization process was studied considering the influence of experimental parameters such as catalyst concentration, TiO2/ZnS ratio, pH and methylene blue adsorption rate. The material with the best catalytic activity towards the methylene blue photodecolorization was the TiO2 doped with 0.2% of ZnS. The complete photodecolorization of a 20 ppm methylene blue Solution, at natural pH was achieved in less than 20 min, nearly 70 min faster than the TiO2 photoassisted process. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：545 / 550

页数：6

共 26 条

[21] CONTROLLED GROWTH OF MONODISPERSE SILICA SPHERES IN MICRON SIZE RANGE [J].