文献类型：期刊文献

英文题名：Molten salt synthesis of crystalline photocatalytic potassium octatitanate whiskers from KCl melt

作者：Wang, Qiang[1];Guo, Qingjun[1];Wang, Heng[1];Li, Bing[1]

机构：[1]E China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2015

卷号：155

起止页码：38

外文期刊名：MATERIALS LETTERS

收录：;EI(收录号：20152000846670);WOS:【SCI-EXPANDED(收录号:WOS:000356739300011)】；

基金：This work was supported by National Natural Science Foundation of China (No.51274102).

语种：英文

外文关键词：Microstructure; Semiconductors; Potassium octatitanate; X-ray techniques; Photocatalysis

摘要：High-quality potassium octatitanate (K2Ti8O17) whiskers were successfully synthesized by reaction of rutile TiO2 with stoichiometric K2CO3 from KCl melt at 760-800 degrees C. The characterization results from Xray diffraction and Energy dispersive X-ray spectroscopy revealed single-phase K2Ti8O17 whiskers with highly crystalline nanostructure have been obtained. The scanning electron microscopy combined with transmission electron microscopy showed the well dispersive K2Ti8O17 whiskers have a uniform length ranging from 5 mu m to 10 mu m with 40-80 nm in diameter. Selected area electron diffraction and high-resolution transmission electron microscopy indicated the K2Ti8O17 whiskers have grown preferentially along the [010] direction. According to UV-vis absorption spectrum, the direct band gap of the K2Ti8O17 whiskers was estimated to be 3.31 eV. Furthermore, the K2Ti8O17 whiskers have shown good photocatalytic activity in the photodegradation of methyl orange under ultraviolet (UV) light irradiation. (C) 2015 Elsevier B.V. All rights reserved.