Synthesis and photocatalytic activity of ZnO/ZnO2 cornposite

被引：95

作者：

Hsu, CC ^{[1
]}

Wu, NL ^{[1
]}

机构：

[1] Natl Taiwan Univ, Dept Chem Engn, Taipei 106, Taiwan

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 2005年 / 172卷 / 03期

关键词：

photocatalysis; ZnO; ZnO2; hydrothermal synthesis;

D O I：

10.1016/j.jphotochem.2004.12.014

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：

ZnO/ZnO2 composite photocatalysts were synthesized by hydrothermal treatment at 120-180 degrees C of ZnO2, which in turn was obtained from an aqueous solution of ZnSO4 and H2O2. The composite particles showed morphology of ZnO prismatic crystallites with small ZnO2 granules "fused" at surface. Photocatalytic activity was characterized based on photocatalytic degradation of methyl orange under UV-light (300 nm) illumination, and the maximum activity was observed for the powder with an intermediate ZnO2-to-ZnO conversion. The enhanced activity, as compared with the pure ZnO crystallites, has been attributed to the presence of the intimately bonded ZnO/ZnO2 surface hetero-structure. This study also points out a new approach to synthesize a composite photocatalyst containing strongly coupled constituents by phase transformation reactions among the constituents. (c) 2004 Elsevier B.V. All rights reserved.

引用

页码：269 / 274

页数：6

共 18 条

[1]

ALQARADAWI S, 2002, J PHOTOCH PHOTOBIO A, V148, P161, DOI DOI 10.1016/S1010-6030(02)00086-2

[2] PHOTOELECTROCHEMISTRY IN SEMICONDUCTOR PARTICULATE SYSTEMS .16. PHOTOPHYSICAL AND PHOTOCHEMICAL ASPECTS OF COUPLED SEMICONDUCTORS - CHARGE-TRANSFER PROCESSES IN COLLOIDAL CDS-TIO2 AND CDS-AGI SYSTEMS [J].