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High Nuclear Polyoxometalates Based Composite Materials and Their Properties Research

Author: XiongTian
Tutor: ZhouYunShan
School: Beijing University of Chemical Technology
Course: Chemical Engineering and Technology
Keywords: Polyoxometalates Keplerate type multi- acid Large ship -type multi- acid Layer-by-layer assembly Nanotubes Photocatalytic Degradation of nitrogenous organic dyes
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 78
Quote: 1
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Abstract


Polyoxometalate (Polyoxometalates), referred to as multi-acid (POMs), mainly metal - oxygen species polynuclear complexes of transition metal ions. Multi-acid from the discovery of the past two centuries, has been active in various fields, so that multi-acid chemistry yet he is still a growing number of scientific and technological workers concerned about the hot research including acid nucleation, and more acid nanomaterials acid catalytic chemistry, and so on. High nucleation multi-acid origin nineties, the structure size achieve the nanometer level, building nanomaterials provides inherent advantages, coupled with its excellent features and multi-acid have been active in the field of catalysis , a high nucleation acid application prospects provide a reference. This article the high nuclear molybdenum cluster Keplerate-type multi-acid acid {Mo132} and the wheel of type {Mo154} structural unit, self-assembly method using the template, high nuclear acid polyelectrolyte combination of high nuclear technology to build a high-quality multi- acid organic and inorganic nanotubes. PC porous template of PEI, PSS and PAH first build a precursor film, then the high nucleation acid {Mo132} or {Mo154} by electrostatic interactions with the the polyelectrolytes PAH layers of self-assembled into a PC within the template. The get high nucleation acid compound nanotubes dissolved in chloroform PC. Through a series of characterization and study, we studied the conditions of the nanotubes into tube, confirmed the high nucleation acid {Mo132} or {Mo154} its complete structure is assembled to the nanotube, wherein a high nucleation molybdenum The clusters {Mo132} constructed nanotubes quality than the high nuclear molybdenum cluster {Mo154} constructed nanotubes quality is higher and the size and thickness of the nanotubes controllable. Then, select the acid the high nuclear molybdenum cluster Keplerate-type {Mo132} and its derivatives as a catalyst to study the photocatalytic degradation of nitrogen-containing organic dyes. Respectively to the high nuclear molybdenum cluster Keplerate-type acid {Mo132} DODA completely wrapped {Mo132}, and the the TBAB non-fully wrapped {Mo132} common nitrogen-containing organic dye Rhodamine B photocatalytic degradation found TBAB non-fully wrapped {Mo132} catalytic activity is much better than the other two. So he chose to focus on the object of study, explore the photocatalytic reaction, the initial solution pH, dye concentration and the amount of catalyst on the catalytic reaction, and the catalyst was recycled and experiment. Combined with previous studies and the present results, the photocatalytic mechanism discussed, proposed that this is a place in the acid surface OH · radical attack based photocatalytic reaction. This paper template self-assembly method to build a high nuclear acid inorganic and organic nanotubes, nanomaterials acid build high nuclear to provide a method and ideas. Addition, to start the the high nucleation multi acid and its derivatives photocatalytic properties of acid application to develop high nucleation pointed in one direction.

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