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Preparation and Photo-catalytic Activity of TiO2 Hollow Spheres

Author: WangZuoHui
Tutor: ZhaoZongBin
School: Dalian University of Technology
Course: Functional Materials Chemistry and Chemical Engineering
Keywords: TiO2 Template Method Sol-gel Porous Hollow Spheres Photocatalysis
CLC: O643.36
Type: Master's thesis
Year: 2009
Downloads: 437
Quote: 2
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Abstract


Nowadays,the creation of effective photocatalytic materials with large specific surface area,high catalytic activity,visible-light-respond,become a hot topic in photo-catalytic research.The modifications of TiO2 photocatalyst is studied widely,such as metallic or non-metallic doping,noble metal depositing as well as supported TiO2.Porous hollow sphere materials,core-shell structure materials and macroporous materials with good stability,low density,large specific surface area and other characteristics,have promising applications in the catalytic reaction,optoelectronic devices,and environmental protection.In this paper,combined hydrothermal with so-gel and template methods,a series of TiO2-based photocatalysts were successfully synthesized,including porous hollow spheres, core-shell structure and macroporous materials.The structures,morphologies and compositions of the samples were characterized by SEM,TEM,X-ray diffraction, TGA-SDTA,FT-IR spectrometer and UV-Vis spectrophotometer.The photo-catalytic activities of the products were evaluated via the photo-catalytic degradation of methyl blue under UV-light irradiation.The main results are summarized as follows:1.A smart and compact floating-type photocatalytic reactor was designed,with the advantages of uniform light intensity,high light utilization and high mass transfer rate,reaction time automatic controlling,sampling convenience,safety and reliability.It can be used to investigate photo-catalyst activities and photocatalytic reaction factors scientifically and accurately.2.Carbonaceous micro-sphere templates with rich oxygen-containing groups on their surface were synthesized under hydrothermal condition using glucose as starting materials. TiO2,WO3 and W doped TiO2 porous hollow spheres were prepared through template-deposition-surface reaction method.The influence of W contents and calcination temperatures on the catalytic activites of W doped TiO2 porous hollow spheres was systematically examined.TiO2 macroporous catalyst was prepared by so-gel method,and the relationship between its photocatalytic activity and the amount of carbon microspheres used was also investigated.3.Ag@C core-shell micro-spheres with rich oxygen-containing groups on their surface were synthesized under hydrothermal condition using glucose and AgNO3 as starting materials.With Ag@C as templates,deposition-surface reaction was used to prepare Ag/TiO2, Ag/AgCl/TiO2 and Ag/WO3 porous hollow spheres,while so-gel method was used to prepare Ag/NiO,Ag/SnO2 and Ag/WO3 macroporous materials.4.Monodisperse polystyrene（PS） microspheres were synthesized through dispersion polymerization method,and their surface was modified by concentrated sulfuric acid.With the sulfonated PS microspheres as templates,Fe-TiO2-PS,Fe-TiO2,α-FeO（OH）-PS andα-Fe2O3 porous hollow microspheres were successfully prepared under hydrothermal condition.The influence of Fe-doped amount on the photocatalytic activity of Fe-TiO2 porous hollow microspheres was also examined.5.Monodisperse SiO2 microspheres were prepared by Stober method,then Ag nanoparticles were deposited on their surface by Ag+ reduction in aqueous solution, carbonaceous materials was sequentially encapsulated on Ag/SiO2 microspheres with glucose as the carbon precursor during hydrothermal process to form Ag/SiO2@C microspheres.With Ag/SiO2@C microsphere as templates,Ag/SiO2@TiO2 composites were successfully fabricated with template-deposition-surface reaction method.The photo-catalytic activity of the obtained Ag/SiO2@TiO2 was investigated.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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