Research And Preparation Of Nano Titanium Dioxide Based Functional Composite Materials

In recent years, nano Titanium Dioxide(TiO2) materials as an n-type semiconductormaterial with unique physical and chemical properties, is playing an important role inmany fields,for exampal,being the ideal environmental pollution cleaning product、solarcells and other photocatalysis materials,also being materials in the adsorption of heavymetal ions.. Unfortunately, there still exists some key scientific and technologicalproblems with titanium dioxide based materials, such as low quantum efficiency andlow absorbtion of solar energy and the recombination of photogenerated electron-holepairs, which greatly restricts its widely practical applications in industry.In our study,we grafted varieties of functional shells on the surface of TiO2nanoparticles to preparedifferent kinds of functional composites. In this paper, the main research works are asfollows:1. We successfully prepared the functional nanocomposites, which possessing coresof nano titanium dioxide (TiO2) connected with special groups of the Dopaminemolecular and functional shells of brushlike glycidyl methacrylate (GMA). FTIR, TGA,XPS, UV-vis, and other methods were used to determine the composites’ chemicalstructure, thermal properties, and quantities of the grafted shells. FTIR results of thesamples monitored the synthesis process of the complex composites. The weight loss ofthe functional composites were dramatically elevated relative to that of pristine TiO2according to the TGA results which suggested GMA were covalently linked to the TiO2.UV-vis results demonstrated the successfully preparation of visible-light respondingphotocatalyst composites. The photo-degradation experiment of methylene bluesamples indicated that the performance of modified titanium dioxide is enhancedobviously.2. We studied the deposition of metal on the surfaces of TiO2nanoparticles. Thefunctional nanocomposites were modified with specific coupling agents, such as theepoxy groups. We used NH2-trz for the direct coupling with the epoxy groups to giverise to the TiO2-based nanoparticles, then the functional groups was used to attract Agions. After that, the irons were reduced by NaBH4. Finally, we successfully obtainedTiO2based nano composites with metal deposition on the shells of the complexmaterials.We use FTIR, TGA, SEM and XRD to characterize the synthesis of thefunctionalized hybrid composites. 3. In view of the poor performance of nano TiO2photocatalyst in dispersionand recycle, we designed a reasonable route for the preparation of TiO2nanoparticles based hybrid films. First, the surface of TiO2was modified bysilane coupling agent KH570(γ-methacryl trimethoxysilane). Surfacemodification by alkali treatment of Polyvinylidence Fluoride (PVDF) wasrealized to get double bond groups. Then classical radical polymerization ofTiO2-KH570、GMA and the modified PVDF monoter was initiated to obtain theternary copolymer compositesTiO2-GMA-PVDF. The plentiful epoxy groups ofPGMA brushes could be used for the direct coupling of4-amino-1,2,4-triazole toobtain hybrid functional materials to acquir excellent adsorption properties for metelions. The hybrid materials could be applied in the treatment of heavy metal poisoningwith its hydrophilic, high coordinition capacity.