期刊
CHEMICAL ENGINEERING JOURNAL
卷 180, 期 -, 页码 330-336出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2011.10.098
关键词
Monolayered titanate; CdS colloids; Exfoliation-restacking; Visible-light photodegradation
资金
- National Natural Science Foundation of China [21001093]
- Zhejiang Provincial Natural Science Foundation of China [Y4090285, Y4110418]
- Science Foundation of Zhejiang Sci-Tech University [0913840-Y]
CdS-pillared titanate as an efficient visible-light active photocatalyst has been synthesized through a simple reassembling reaction between negatively charged titanate sheets and positively charged CdS colloid nanoparticles. The formation of the heterostructure with the interlayer spacing of 2.7 nm was clearly evidenced by powder X-ray diffraction and high-resolution transmission electron microscopic analysis. The diffuse reflectance UV-visible measurement demonstrated that the nanocomposite displays dual band-gap character with E-g = 3.47 and 2.24 eV, corresponding to the values for titanate host layers and CdS nanoparticles. respectively, and the optical feature of CdS nanoparticles make them as the sensitizers to photosensitize titanate host layers under visible-light irradiation. The test of photocatalytic activity revealed that the methylene blue molecules could be photodegraded effectively under the visible-light irradiation (lambda > 420 nm). (C) 2011 Elsevier B.V. All rights reserved.
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