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Study on the Controllable Preparation and the Photocatalytic Properties of Nano-TiO2

Author: DengAnPing
Tutor: HuangYingPing
School: Three Gorges University
Course: Ecology
Keywords: Titanium dioxide Controllable Preparation Microstructure Photocatalytic Mechanism
CLC: X13
Type: Master's thesis
Year: 2010
Downloads: 141
Quote: 0
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Abstract


Nano-TiO 2 because of its small particle size, large surface area, good dispersion, no secondary pollution in the practical application of the advantages of concern, nano TiO 2 of Preparation, Properties and Applications to become a research focus of domestic and foreign scholars. This paper studies the hydrothermal (solvothermal) preparation conditions of nano TiO 2 microstructure affect its catalytic properties under light irradiation on the degradation of toxic organic pollutants discussed the preparation conditions of nano TiO the 2 crystal form and morphology of TiO 2 catalytic properties prepared under different conditions, analysis TiO 2 spectral properties main active species in the photocatalytic system process · OH and H2O 2 changes, and by tracking analysis to explore the photocatalytic reaction mechanism. 1 using the solvent method was prepared under the conditions of the different solvent medium (water, NaOH solution, ethanol, OP emulsifiers, diethanolamine) Nano TiO 2 . Visits to the proportion of different solvents and solvent, NaOH solution concentration, temperature and other conditions TiO 2 crystal microstructure of photocatalytic degradation of organic dyes under UV irradiation performance test, analysis different microstructure of nano TiO 2 spectrum characteristics. 2 cryogenic solvent prepared TiO 2 powder, X-ray diffractometer (XRD), and the ratio of the surface area and pore size analyzer (BET) and transmission electron microscopy (TEM) TiO 2 carried A preliminary characterization. : Nano TiO 2 mainly anatase phase (containing brookite (121)), the specific surface area to 106.2m2 / g. Under UV light (λ ≤ 387nm) irradiation conditions, the organic dye rhodamine B (rhodamine B RhB) and colorless small molecule 2,4 - dichlorophenol (2,4 - dichlorophenol, 2,4-DCP) of Photocatalytic Degradation test reaction as a probe to study the catalytic activity. Indicating that a low temperature (50 ℃) prepared under the TiO 2 powder has a higher photocatalytic activity, preferably the degradation effect RhB and 2,4-DCP. By UV - visible spectroscopy (UV-vis), Fourier transform infrared spectroscopy (FTIR), and total organic carbon (TOC) was found TiO 2 / UV system enables RhB and 2,4-DCP effective degradation reaction after 5h RhB and 7h 2,4-DCP mineralization rates were 81.2% and 86.8%. At the same time, using horseradish peroxidase enzyme (POD), N, N-diethyl-p-phenylenediamine (DPD) spectrophotometry and spectrofluorimetry benzoate were measured in the degradation process the H2O 2 and the change of the hydroxyl radical (· OH), showed that TiO 2 photocatalytic mechanism related to the course of · OH. 3 as precursors to amorphous TiO 2 precipitation under hydrothermal conditions were prepared containing plates anatase TiO 2 nanoparticles investigated the hydrothermal reaction temperature and time and other factors 2 photocatalytic activity of anatase TiO containing plates . By XRD, TEM prepared TiO 2 preliminary characterization, and the photoactive probe reaction degradation of organic dyes combined photocatalysis (λ ≤ 387 nm), the results indicate that the hydrothermal temperature of 150 ° C, time can be obtained for 24 h with higher photocatalytic activity of nano-containing brookite TiO 2 . Photocatalytic test study the dye Sulforhodamine (Sulforhodmine B, SRB) fading and degradation and intermediate H2O 2 and · OH track determination that contain board anatase TiO 2 Photocatalytic involving · OH oxidation journey. 4 octylamine (n-octyl amine, OA) as a template by sol - precipitation method TiO 2 @ SiO 2 nanospheres were prepared by TEM, XRD, electrical chemical properties and organic dyes Sulforhodamine (Sulforhodamine B, SRB), rhodamine B (rhodamine B, RhB) photocatalytic probe reaction to explore TiO 2 @ SiO 2 the nanosphere preparation process acidity and calcination temperature on the morphology, crystal type and photocatalytic properties. The results show that: the reaction temperature of 50 ° C, 1 mol / L HCl medium conditions and the conditions of 550 ° C calcination temperature obtained TiO 2 @ SiO 2 powder ratio capacitor the highest dispersity good to anatase nanospheres; trial by spin resonance (Electron Spin Resonance, ESR), spectrophotometry, infrared spectroscopy, and total organic carbon analysis of the catalyst under ultraviolet light catalytic degradation of organic dyes the SRB and RhB and small molecule 2,4-DCP photocatalytic reaction characteristics of mineralization oxidation effect and degradation mechanism. The experiments show that: the photocatalytic effect with commercial P25 similar mineralization of organic pollutants good degradation process involving · OH oxidation mechanism. 5 tetrabutyl titanate and cerium nitrate and iodine and other raw materials by the sol - gel method and calcination temperature of 450 ℃ prepared by the proportion of different doping TiO 2 catalyst. XPS, XRD, TEM and TG catalyst characterization and optical properties of the test. The results show that: the co-doped TiO 2 band gap decreased from 3.03eV to 2.51eV the TiO 2 nano-size of about 13nm, mainly anatase Iodine and Cerium doped TiO 2 the lattice have good thermal stability, the catalyst is less than 2%, thermogravimetric. Degradation of RhB probe reaction to iodine cerium co-doped nano TiO 2 optimized oxide species and photocatalytic reaction system to track determination found under visible light doped TiO 2 degradation kinetic constants increased six-fold, and the photocatalytic process involves hole oxidation mechanism.

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