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发表刊物：Nanotechnology

摘要：Exfoliated hexaniobate nanosheets E-H2K2Nb6O17−x (E-HKNO) with broad light absorption (up to 850 nm) and high adsorption properties were prepared via ion exchange and transient annealing processes with micron-size K4Nb6O17 powders as the precursor. The as-prepared E-HKNO nanosheets show excellent visible light photodegradation performances when compared to degussa P25, which was evaluated in terms of degradation of Rhodamine B (Rh B). High adsorption and broad light absorption characteristics could beattributedtothe exfoliation behavior and the reduction of surface Nb5+ to Nb4+, which was confirmed by x-ray photoelectron spectroscopy (XPS) and Raman spectra. From the Mott–Schottky analysis, the E-HKNO is an n-type semiconductor and has a higher flat band voltage (−0.46V versus RHE at pH = 7),comparedwithK4Nb6O17.In addition, the electrochemical impedance spectroscopy (EIS) indicates that the E-HKNO nanosheets have an increased semiconductor–electrolyte charge transfer resistance, which is not conducive to the separation of photogenerated carriers (e−-h+). Accordingly, a small amount of holes scavenger (EDTA) was added to improve the photodegradation performance of the E-HKNO, since the holes scavenger can inhibit the recombination of the photogenerated carriers. This work provides not only a facile method for the preparation of an efficient E-HKNO nanosheets photocatalyst, but also new insights for further enhancing the photodegradation performance by adding trace scavenger.

全部作者：Peng Chen,Yapeng Tian,Jie Liu,Zuoli He,Huanfu Zhou,Ling Bing Kong

第一作者：Xiaobin Liu

论文类型：期刊论文

通讯作者：Wenxiu Que

期号：28

页面范围：235702 (12pp)

是否译文：否

发表时间：2017-05-01

收录刊物：SCI