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
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.
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