期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 190, 期 1-3, 页码 566-573出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2011.03.079
关键词
Nanostructure; Titanium oxide; Hydrothermal synthesis; Single crystal
资金
- Zhejiang Provincial Natural Science Foundation [Y4080001]
Anatase single crystals with exposed (0 0 1) facets have been the focus of many researches in recent years. This paper reports the hydrothermal synthesis of (0 0 1)-exposed anatase single crystals through reactions of Ti plates in aqueous HF solutions with mass concentrations of 0.15-0.80%, in an autoclave at 180 degrees C for 2-12 h. The size of the achieved anatase single crystals varied from 0.4 to 13.6 mu m, exposing 15-49% (0 0 1) facets. The crystal size and the (0 0 1) fraction increased with increasing HF concentrations. For a prolonged reaction time, anatase crystals with larger sizes and reduced fractions of (0 0 1) facets were achieved. The activity of the anatase crystals to assist photodegradation of rhodamine B in water increased with decreasing sizes and increasing fractions of (0 0 1) facets. Selective erosion of the anatase single crystals along the high-energy (0 0 1) facets was noted, for the first time, which resulted in cone-shaped walls with a thickness ranging from several to hundreds of nanometers. The selective erosion contributed to the photocatalytic activity of the (0 0 1)-exposed anatase single crystals. (C) 2011 Elsevier B.V. All rights reserved.
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