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Synthesis of TiO2-based Nano-sized Photocatalysts and Their Applications in Photocatalysis and Superhydrophilicity

Author: LiuZhaoYang
Tutor: QuanZuo；LiXinYong
School: Dalian University of Technology
Course: Environmental Engineering
Keywords: Sonochemical Composite photocatalyst TiO2 SiO2 Nanofibers Superhydrophilic Glass fiber cloth Coating
CLC: TQ426
Type: PhD thesis
Year: 2004
Downloads: 970
Quote: 3
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Abstract


This thesis is to improve the nano-TiO 2 and super-hydrophilic photocatalytic performance, made the following three were part of the study: (1) chemical synthesis using ultrasonic nano SiO 2 / TiO 2 composite oxide. This is based on a single distributed under ultrasonic irradiation control sol particles can form condensation and aggregation of pore size distribution of nano-pore structure of the idea. The prepared composite catalyst by differential thermal - thermal gravimetric analysis (TG-DTA), X-ray diffraction (XRD), transmission electron microscopy (TEM), infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and nitrogen adsorption - desorption for characterized. With formaldehyde gas (HCHO) as model organisms for their photocatalytic activity were evaluated. System discussed composite oxide prepared structure and physical and chemical properties, and their photocatalytic activity, and its relations; find out the composite catalyst prepared with a high photocatalytic activity causes. The results showed that ultrasound chemical preparation of mesoporous composite nano-catalyst showed photocatalytic activity than the product of the activity of the photocatalyst Degussa P25 is three times higher. Produce high photocatalytic activity because: Si, Ti elements closely to make TiO 2 catalyst emergence of new physical, chemical and structural properties, such as uniform mesoporous structure, high specific surface area, grain Quantization size of the reactants and a high absorption rate. Ultrasonic chemical preparation methods significantly improve the photocatalytic activity. Si / Ti ratio of 10 mass% of the composite catalyst reaches its highest photocatalytic activity. (2) Preparation of a three-dimensional mesh array ordered TiO 2 nano fiber membrane, the realization of TiO 2 nano fiber diameter and length of the effective control and TiO 2 nanofibers oriented growth. And ordered TiO 2 nanofiber membrane surface modification of the molecular assembly method SiO 2 thin layer of surface wettability modification. Systematically explored TiO 2 nanofibers photocatalytic air purification performance and ultra-hydrophilic properties of pollutants. The results showed that: in the photocatalytic oxidation of organic pollutants in surface adsorption rate of the air side, with a nano-fiber structure TiO 2 film than the flat surface of TiO 2 film 8 times faster. This is mainly due to the nano-fiber structure having a large porosity and specific surface area, which will help to increase the reaction area and the use of ultraviolet light. Nanofiber structure TiO 2 film in the dark without UV hydrophilic hold time is the common plane TiO 2 2-fold film, largely because of its rough surface three-dimensional capillary action caused; SiO 2 -modified TiO 2 nano fiber membrane can effectively improve the film's super-hydrophilic effect, in the absence of UV irradiation, its hydrophilic longer lasting, mainly because SiO 2 material is easily formed on the surface of the physically adsorbed water layer thick, the film can be maintained after stopping illumination hydrophilic long time. (3) using the sol - gel method nano-glass fiber cloth load TiO 2 photocatalyst film. System Dalian University of Technology doctoral thesis studied the carrier and TIO: interfacial interaction between the film and its photocatalytic activity, thus optimizing the TIO: photocatalyst film photocatalytic activity. The prepared glass fiber cloth load nano TIO: photocatalyst film with a large surface area, good air circulation, high light transmittance, good flexibility and environmental advantages of good stability, high polluting gases formaldehyde degradation efficiency . These materials in the indoor air purifier and so has broad application prospects. Keywords: ultrasonic chemistry; composite photocatalyst; TIOZ; 5102; nano fiber membrane; super-hydrophilic; glass fiber cloth; coating

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CLC: > Industrial Technology > Chemical Industry > Reagents and the production of pure chemicals > Catalyst ( catalyst )
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