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The Synthesis of TiO2Nanomaterials in Lamellar Liquid Crystal and Study of Catalysis Performance

Author: LiuLiHua
Tutor: WangFuMin; JinDengChao
School: Tianjin University
Course: Chemical Engineering
Keywords: lamellar liquid crystal template method capping agent TiO2 nanomaterials
CLC: O614.411
Type: Master's thesis
Year: 2012
Downloads: 49
Quote: 0
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Abstract


Lamella liquid crystal has characteristic of anisotropy and easy to be adjusted andcontrolled, which promotes intensive study of preparation of nanomaterials templatedby lyotropic liquid crystalline. TiO2nanomaterials with controllable size andmorphology were prepared in lamella liquid crystal phase in this work. Polarizationmicroscope （POM） and small angle X-ray scattering （SAXS） were used fordetermining the phase structure of lyotropic liquid crystal. The produced sampleswere characterized by X-ray diffraction （XRD）, fourier transform infraredspectrometer （FT-IR）, transmission electron microscopy （TEM）, scanning electronmicroscopy （SEM） and their photocatalytic performance were tested usingdegradation of dye Rh-B as model reaction.TiO2nanoplate and mesoporous microsphere have been successfully synthesizedusing CTAB as the capping agent in the lamellar liquid crystal consisted ofTritonX-100and TiOSO4aqueous solution by direct precipitation method andhydrothermal method, respectively. The effect of reactant concentration andCTAB/TX-100mass ratio on the morphology and size of the products were studiedsystematically. The photocatalytic activity of TiO2samples was evaluated by thedegradation of dye Rh-B. A possible formation mechanism was proposed.TiO2nanomaterials were prepared using TiOSO4as reactant, NH3·H2O asprecipitator by homogeneous precipitation method and lyotropic liquid crystal as softtemplate, which was formed by CTAB/n-C5H11OH/H2O ternary system. The effect ofreactant concentration on the shape and size of the samples was investigated andresults show that TiO2with specific shape can be obtained by adjustment of thereactant concentration.The rigid lamellar liquid crystal, which is ternary multicomponent systemcomprising TX-100, n-C6H12OH, TiOSO4aqueous solution, and cyclohexane （C6H12）can be formed in a microemulsion system. TiO2nanomaterials have been synthesizedusing this LLC as template by homogeneous precipitation method. The results showthat the reactant concentration and O/W volume ratio have an effect on the morphology and size of the products. The formation mechanisms of different shapesamples were discussed.A novel, simple and effective method to prepare TiO2nanomaterials withcontrollable size and shape was developed in this work. The structure of lamellarliquid crystal has an important effect on the shape and size of the final products. Thestructure and performance of nanomaterials can be controlled by adjustment of thecomposition of the lamellar liquid crystal. It is expected that this method can be usedto prepare other nanomaterials with specific performance.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Section Ⅳ group metal elements and their compounds > The titanium Vice family ( IV B group metal elements) > Ti Ti
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