期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 105, 期 3-4, 页码 335-345出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2011.04.028
关键词
Zinc oxide; Morphology; Ultrasonic; Photoluminescence; Photocatalysis; Mechanism
资金
- National Natural Science Foundation of China [20876110, 21076146]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20090032110013]
- University of China [NCET-07-0599]
- Program of Introducing Talents of Discipline [B06006]
The flower-like ZnO materials were hydrothermally synthesized with or without ultrasonic assistance. When low dosage of citric acid is used, ultrasonic treatment can enhance the distribution and complexation of Zn ions: the formed complicated citrates can serve as soft template directing the formation of seaweed-like ZnO/Zn(OH)(2) precursor: this precursor with citrates attaching on it serves as hard template for the formation of regular flower-like ZnO in the hydrothermal condition. The photoluminescence spectra have identified several kinds of defects in as-synthesized ZnO materials, such as oxygen vacancy (V-o), zinc vacancy (V-Zn) and interstitial zinc (Zn-i). The activity evaluation and kinetic calculation show that the samples with higher relative content of oxygen vacancy possess larger reaction rate constant and higher catalytic activity for Rhodamine B photodegradation. The employment of ultrasonic treatment during preparation decreases the relative content of oxygen vacancy, thus suppressing green emission and reducing the photocatalytic activity of such flower-like ZnO. (C) 2011 Elsevier B.V. All rights reserved.
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