Facile synthesis of urchin-like hierarchical Nb2O5 nanospheres with enhanced visible light photocatalytic activity
Facile synthesis of urchin-like hierarchical Nb2O5 nanospheres with enhanced visible light photocatalytic activity
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DOI：
10.1016/j.jallcom.2017.08.266
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发表时间：
2017-12-25
影响因子：
6.2
通讯作者：
Zhang, Yonghui
中科院分区：
文献类型：
--
作者：
Chen, Junli;Wang, Hai;Zhang, Yonghui
采用一种简便的无模板法合成了具有300-500 nm总直径的海胆状Nb 2 O 5纳米球，其中包含直径为5-10 nm，长度约为100 nm的有序独立纳米棒。X射线衍射（XRD）和场发射扫描电子显微镜（SEM）结果表明，Nb 2 O 5的形貌可以通过调节起始溶液中水/乙醇的比例来调节。高分辨率透射电子显微镜图像表明，纳米棒的生长沿着[001]区方向。通过XRD和透射电子显微镜研究了海胆状Nb 2 O 5的形成机理。在水/乙醇比为1/1的条件下制备的海胆状Nb 2 O 5 -1-1纳米球对罗丹明B（RhB）的可见光催化降解活性最高，约为Nb 2 O 5 -1-4的4.4倍，约为TiO 2（P25）的4.1倍。利用对苯二甲酸光致发光技术和光电化学方法研究了RhB在海胆状Nb 2 O 5纳米球上的降解机理。结果表明，染料敏化光降解过程是可见光照射下RhB降解的主要机理。(C)2017爱思唯尔B. V.保留所有权利。
Urchin-like Nb2O5 nanospheres having an overall diameter of 300-500 nm and containing well-ordered independent nanorods with a diameter of 5-10 nm and a length of about 100 nm were synthesized using a facile and template-free method. X-ray diffraction (XRD) and field emission scanning electron microscopy results showed that the morphology of Nb2O5 can be regulated by adjusting the ratio of water/ethanol in the starting solution. High-resolution transmission electron microscopy images indicated that the nanorods grew along the [001] zone direction. Then, the formation mechanism of the urchin-like Nb2O5 was investigated through XRD and transmission electron microscopy. The urchin-like Nb2O5-1-1 nanospheres obtained at a water/ethanol ratio of 1/1 exhibited the highest photocatalytic activity for the degradation of Rhodamine B (RhB) under visible light, showing about 4.4 times of the activity of Nb2O5-1-4 and about 4.1 times of that of TiO2 (P25). The degradation mechanism of RhB on the urchin-like Nb2O5 nanospheres was demonstrated by terephthalic acid photoluminescence technique and photoelectrochemical measurements. The results revealed that the dye-sensitized photodegradation process was the main mechanism of RhB degradation under visible light irradiation. (C) 2017 Elsevier B.V. All rights reserved.