Novel photocatalyst, Bi2Sn2O7, for photooxidation of As(III) under visible-light irradiation

Novel photocatalyst, Bi2Sn2O7, for photooxidation of As(III) under visible-light irradiation
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新型光催化剂 Bi2Sn2O7,用于可见光照射下 As(III) 的光氧化

DOI:
10.1016/j.apcata.2012.03.005
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发表时间:
2012-05
期刊:
Applied Catalysis A: General
影响因子:
--
通讯作者:
Liu, Ping
Liu, Ping
中科院分区:
其他
文献类型:
--
作者:
Zhuang, Ji;ong;Wang, Jixin;Xie, Liyan;Liu, Ping

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采用水热法合成了纳米晶Bi2Sn2O7可见光催化剂,首次用于去除水溶液中的亚砷酸盐。采用x射线衍射、n2吸附-解吸、紫外-可见漫反射光谱、透射电镜、电子自旋共振、x射线光电子能谱和电化学技术对合成的bi2sn2o7产物进行了表征。结果表明,样品的平均粒径约为10nm,比表面积为51.3m2/g,带隙为2.88eV。此外,bi2sn2o7纳米粒子在可见光照射下对As(III)的氧化表现出较高的光催化活性(高达96.8%)。O2−和h+被认为是负责as (III)氧化的主要活性物质。同时,还提出了砷(III)在bi2sn2o7上光氧化的可能机理。
Nanocrystalline Bi2Sn2O7, a visible-light photocatalyst synthesized via a facile hydrothermal route, is used to remove arsenite from aqueous solution for the first time. The as-synthesized Bi2Sn2O7product is characterized by X-ray diffraction, N2sorption–desorption, UV–vis diffuse reflectance spectroscopy, transmission electron microscopy, electron spin resonance, X-ray photoelectron spectra, and electrochemistry technology. The results reveal that the sample has an average particle size of approximately 10nm, a specific surface area of 51.3m2/g, and a band gap of 2.88eV. Moreover, the Bi2Sn2O7nanoparticles exhibit a high photocatalytic activity in the oxidation of As(III) (up to 96.8%) under visible-light irradiation. O2−and h+are recognized as the primary active species responsible for As(III) oxidation. Meanwhile, a possible mechanism for the photo-oxidation of As(III) over Bi2Sn2O7is also proposed.
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