Coupling with a narrow-band-gap semiconductor for the enhancement of visible-light photocatalytic activity: preparation of Bi2OxS3-x/Nb6O17 and application to the degradation of methyl orange
Coupling with a narrow-band-gap semiconductor for the enhancement of visible-light photocatalytic activity: preparation of Bi2OxS3-x/Nb6O17 and application to the degradation of methyl orange
复制标题
与窄带隙半导体耦合增强可见光光催化活性：Bi2OxS3-x/Nb6O17的制备及其在甲基橙降解中的应用
DOI：
10.1039/c6dt02338j
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发表时间：
2016-01-01
影响因子：
4
通讯作者：
Li, Yangguang
中科院分区：
文献类型：
--
作者：
Yan, Gang;Shi, Hongfei;Li, Yangguang
以Bi3+交换的K4Nb6O17和硫脲（NH2CSNH2）为原料，采用水热硫化法合成了一系列二维片状Bi2OxS3-x/Nb6O17 （Bi/Nb）异质结构光催化剂。XRD结果证实异质结构由Bi2OxS3-x和Nb6O17组成。HRTEM表明Bi2OxS3-x被成功嵌入到K4Nb6O17层中。这种大的界面接触有利于光生载流子的转移和分离。因此，复合材料在可见光照射下（λ > 400 nm）表现出良好的光催化降解甲基橙（MO）的性能，优于纯Bi2S3和K4Nb6O17两种前驱体。自由基捕获实验表明，光生成的空穴h（+）和o中心点(2)-在MO的光降解过程中起着重要的作用，并基于半导体的紫外-可见漫反射光谱（DRS）和带隙，提出了这些复合材料可见光光催化活性增强的机理。
A series of 2D sheet Bi2OxS3-x/Nb6O17 (Bi/Nb) heterostructure photocatalysts were synthesized through a facile hydrothermal vulcanization method between Bi3+ exchanged K4Nb6O17 and thiourea (NH2CSNH2). XRD results confirm that the heterostructures were composed of Bi2OxS3-x and Nb6O17. HRTEM indicates that Bi2OxS3-x was successfully intercalated into layers of K4Nb6O17. Such large interfacial contacts can be beneficial to the transfer and separation of photogenerated charge carriers. Thus the composites exhibit good photocatalytic performance for the degradation of methyl orange (MO) under visible light irradiation (lambda > 400 nm), which is superior to that of both precursors, pure Bi2S3 and K4Nb6O17. Radical capture tests reveal that photogenerated holes h(+) and O-center dot(2)- play important roles in the photodegradation of MO. And based on the UV-visible diffuse reflectance spectra (DRS) and the band gap of the semiconductors, the mechanism of the enhanced visible light photocatalytic activity of these composites has been proposed.