Preparation of a cerium/titanium composite with porous structure and enhanced visible light photocatalytic activity using β-cyclodextrin polymer microspheres as the templateJinlong Li, Shuaiqiang Jia, Guozhe Sui, and Lijuan Du Qiqihar University, Qiqihar, China
E-mail: jinlong141@163.com Abstract: A porous Ce/TiO2 composite exhibiting high photocatalytic activity was successfully prepared by a sol–gel method using β-cyclodextrin (β-CD) polymer microspheres as the template. The structural and morphological characteristics of the prepared Ce/TiO2 composites were examined by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, low-temperature N2 adsorption–desorption, thermogravimetry–differential thermal analysis, diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. The characterization results revealed that after the calcination of as-prepared Ce/TiO2 at 500 °C, it exhibits a porous structure with a TiO2 anatase phase. The photocatalytic performance of the as-prepared samples according to their different molar ratios was evaluated toward the degradation of rhodamine B (RhB). Compared to commercial TiO2, the porous Ce/TiO2 composite exhibited a higher photocatalytic activity under visible light irradiation at room temperature, with a photodegradation rate of up to 80% for RhB (5 mg L−1) within 60 min. Addition of β-cyclodextrin polymer microspheres as the template not only renders a porous structure but also inhibits the crystal growth and anatase-to-rutile transformation of TiO2. Doping with Ce was hypothesized to decrease the radiative recombination of the photogenerated electrons and holes in TiO2, extending its light response to the visible region.
Keywords: Photocatalytic activity ; β-cyclodextrin polymer microspheres ; Cerium/titanium composite ; Visible light Full paper is available at www.springerlink.com. DOI: 10.1007/s11696-017-0286-5
Chemical Papers 72 (2) 369–379 (2018) |
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