期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 442, 期 -, 页码 1-7出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2014.11.060
关键词
Anatase-brookite TiO2; Sol-gel method; Heterogeneous catalysis; Photocatalysis
资金
- National Institute for International Education (NIIED), South Korea
- Korean Government Scholarship Program (KGSP)
- Ministry of Trade, Industry and Energy of Korea through Human Resources Development program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) [20124030200130]
TiO2 photocatalysts with a mixture of different TiO2 crystal polymorphs have customarily been synthesized hydrothermally at high temperatures using complicated and expensive equipment. In this study TiO2 nanoparticles with a mixture of TiO2 crystals were synthesized using a modified sol-gel method at low temperature. In order to form nanoparticles with different polymorphs a series of samples were obtained at pH 2, 4, 7 and 9. Raw samples were calcined at different temperatures ranging from 200 to 800 degrees C to evaluate the effect of the calcination temperature on the physico-chemical properties of the samples. XRD results revealed that a mixture of anatase and brookite can be obtained in the as-synthesized samples and in those calcined up to 800 degrees C depending on the pH used to obtain the final product. Indeed, a mixture of anatase brookite and rutile; or a sample with only rutile phase can be yielded through further calcination of the as-prepared samples at temperatures >= 600 degrees C due to phase transformation. The photocatalytic performance of the samples with a mixture of anatase-brookite; anatase-brookite-rutile; and anatase-rutile (Degussa P25 TiO2) was exquisitely investigated in the degradation of methylene blue solutions. The samples obtained at pH 2 and calcined at 200 degrees C possessed the highest activity of all due to its superior properties. This study elucidates a facile method suitable for the synthesis of TiO2 with different mixtures of TiO2 polymorphs with desirable properties for various applications. (C) 2014 Elsevier Inc. All rights reserved.
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