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Materials Frontier No.133

Title: Crystalstructure characterisation of titanate based photocatalytic nanomaterials for the degradation of organic compounds

Speaker: Dong Zhi-Li, School of Materials Science & Engineering, Nanyang Technological University 

Date/Time: 2014-03-26,10:00

Venue: Room.323,MaterialBuildingD

Inviter: Prof.Di ZHANG


Zhi-Li Dong is an Associate Professor in Nanyang Technological University of Singapore. 

Dong received his PhD in Materials Science and Engineering and Bachelor of Engineering fromTsinghua University,China. During his study towards a PhD degree, he was granted a Japanese Government Scholarship and studied atOsakaUniversityin 1987 and 1988. He completed his PhD work in 1989 under the MOE Joint PhD Programme.

Dong was trained as a materials scientist and engineer during his undergraduate and postgraduate study atTsinghua UniversityChinaandOsaka UniversityJapan. He has almost thirty years experience in x-ray diffraction and transmission electron microscopy of materials.

Dong developed his research in the areas of materials engineering, electronic structure-crystal structure-property relationships, interface structure analysis, and surface modification when he was working in different institutions. He has graduated a few PhD students in those areas.

Dong’s teaching in NTU is mainly focused on (1) metallic & ceramics materials, and (2) crystallography, X-ray diffraction and transmission electron microscopy of materials.

Prior to joining the School of Materials Science & Engineering of NTU, Dong worked at the Environmental Technology Institute of Singapore as a senior research scientist,SchoolofMechanicaland Production Engineering of NTU as a research fellow,UniversityofBarcelonaas a visiting professor. He was a lecturer atTsinghuaUniversitybefore joining theUniversityofBarcelona.


Layered titanate nanomaterials, traditionally synthesized by alkaline hydrothermal process, have exhibited excellent properties for ion-exchange, catalytic reduction, molecular absorption, photoelectronicity and wettability [1-4]. So far, the synthesis of one and two-dimensional nano-titanate has been widely investigated with many interesting properties reported. For examples, 1D titanate nanotubes, nanowires, nanorods, and 2D titanate nanosheets have been synthesized through hydrothermal, high-temperature oxidation, molten-salt synthesis, and exfoliation methods. However, these approaches either take multiple steps or require a long time in order to ensure complete reaction, which poses a limit to the productivity and often results in high production cost. Here, we discuss a 3D hierarchical titanate micro-spherulite catalysts obtained from a simple, fast, and inexpensive method. The crystal structures of those materials are characterized using X-ray diffraction and high resolution transmission electron microscopy. The obtained titanate powders show relatively good ion-exchange ability and high adsorption rate with toxic Pb2+ ion and the methylene blue dye due to its specific morphology and crystal structure.

1. T. Kasuga, M. Hiramatsu, A. Hoson, T. Sekino, and K. Niihara, Langmuir 14, 3160 (1998).

2. D. V. Bavykin, J. M. Friedrich, and F. C. Walsh, Adv. Mater. 18, 2807 (2006).

3. X. M. Sun and Y. D. Li, Chem. Eur. J. 9, 2229 (2003).

4. D. J. Yang, Z. F. Zheng, H. Y. Zhu, H. W. Liu, and X. P. Gao, Adv. Mater. 20, 2777 (2008).



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