Hydrothermal fabrication and enhanced photocatalytic activity of hexagram shaped InOOH nanostructures with exposed {0 2 0} facets
Hydrothermal fabrication and enhanced photocatalytic activity of hexagram shaped InOOH nanostructures with exposed {0 2 0} facets
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DOI：
10.1016/j.apcatb.2012.10.027
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发表时间：
2013-02
影响因子：
22.1
通讯作者：
Hua Zhao;Wenyan Yin;Mingyuan Zhao;Yuzhe Song;Heqing Yang
中科院分区：
文献类型：
--
作者：
Hua Zhao;Wenyan Yin;Mingyuan Zhao;Yuzhe Song;Heqing Yang
在180 ~ 220℃的温度下，将incl3与NaAc、乙二醇和H2O体系水热反应12h，大量合成了{020}面外露的六角形InOOH纳米结构。六边形纳米结构的六个组成纳米锥体通过定向附着过程沿垂直于正交InOOH的(200)/（2¯00）、(101)/（1¯01¯）和（1¯01）/（101¯）面生长，六边形的上下表面主要被{020}面包围。用乙二醇稳定{020}晶面，控制InOOH晶体的生长。随着水热反应温度的升高，六边形InOOH纳米结构的尺寸减小，（020）面的比表面积和织构系数（TC）增大，从而增强了其光催化活性。在220°C下获得的六边形InOOH纳米结构对罗丹明b的降解表现出比Degussa P25 tio2更高的本禀光催化活性，其优异的本禀光催化活性归因于六边形纳米结构的暴露{020}面百分比高。
Hexagram shaped InOOH nanostructures with exposed {020} facets were synthesized in large quantities via the hydrothermal reaction of InCl3with NaAc, ethylene glycol and H2O system at 180–220°C for 12h. The six constituent nanocones of the hexagram shaped nanostructure grew along the directions perpendicular to (200)/(2¯00), (101)/(1¯01¯) and (1¯01)/(101¯) facets of the orthorhombic InOOH through the oriented attachment process, and the top and bottom surfaces of the hexagrams were dominantly enclosed by the {020} facets. The {020} facets were stabilized by ethylene glycol, which was employed to control the growth of InOOH crystals. When the hydrothermal reaction temperature increased, the size of hexagram shaped InOOH nanostructures decreased, their specific surface area and the texture coefficient (TC) of (020) plane increased, and thus their photocatalytic activity was enhanced. The hexagram shaped InOOH nanostructures obtained at 220°C showed higher intrinsic photocatalytic activity than Degussa P25 TiO2for degradation of rhodamine B. The superior intrinsic photocatalytic activity was attributed to the high percentage of exposed {020} facets of the hexagram shaped nanostructures.