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The Preparation, Characterization and Performance of TiO2 Microsphere Photocatalysts Prepared by Ultrasound Assisted Hydrothermal Process and Their Application for the Photocatalytic Degradation of Bisphenol A in Wastewater

Author: YeChangYing
Tutor: QuanXueJun
School: Chongqing University of Technology
Course: Biomedical Engineering
Keywords: TiO2 microspheres Actual photocatalytic efficiency Photocatalytic Degradation Endocrine disruptors Bisphenol A
CLC: X703.5
Type: Master's thesis
Year: 2011
Downloads: 59
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Abstract


Endocrine disruptors, also known as environmental hormones, mainly that affect the organisms and the human body's own natural hormone synthesis, secretion, metabolism, thus destroying organisms and normal human metabolism, secretion and reproductive functions of exogenous chemical substances. Bisphenol A as an important organic chemical raw materials, is a common endocrine disruptors in the environment, great harm organisms and humans. The the TiO 2 as a semiconducting photocatalytic materials, because of its security, the reaction rate is fast completely oxidized, low energy consumption, no secondary pollution, endocrine disruptors are widely used in processing . The focus from the Existing TiO 2 Business P25 application difficult recovery or efficiency of photocatalytic degradation of low angle of view, the use of ultrasound-assisted - Hydrothermal Synthesis of TiO 2 doped rare earth element Gd preparation Gd-TiO 2 microspheres microspheres and adsorption - heating method, and phenol as a model of organic matter, the evaluation of the photocatalytic activity; Determination of adsorption capacity;, and higher activity TiO 2 microspheres and Gd-TiO 2 microsphere contrast to P25 photocatalytic activity evaluation using XRD, BET, SEM and FT-IR were characterized ; Finally TiO 2 microspheres for Gd-TiO 2 microspheres as a photocatalyst, the research group developed a new type of light source built-in gas - liquid - solid The circulating fluidized bed slurry photocatalytic reactor, degradation of endocrine disruptors - bisphenol A study to examine established for actually containing bisphenol A wastewater treatment technology and process model. The research conclusions are as follows:? Impact on the preparation process of TiO 2 microspheres photocatalytic activity of factors such as the concentration of water in the ethanol solution, n (H 2 O) / n (Ti), n (Ti) / n (P123), the ultrasonic time and the calcination temperature is conducted a comparative study, the results of the optimization are as follows: the concentration of water in the ethanol solution is approximately 10% (V / V), n (H 2 O) / n (Ti) ≈ 5, n (Ti) / n (P123) ≈ 46, ultrasonic dispersion time of 90 min, calcination temperature of 400 ° C hydrothermal stereotypes doped by adsorption - heating method; based on rare earth elements Gd, and investigated the calcination temperature of the material, the amount of Gd doping and doping n (Gd) / n (Ti) its photocatalytic activity. to obtain optimal conditions for the preparation: The material for the uncalcined TiO 2 Microspheres, n (Gd) / N (Ti) = 1.5%, calcination temperature of 600 ° C. 2, TiO 2 microspheres and Gd-TiO 2 the actual photocatalytic efficiency of the microspheres P25 respectively 3.5 and 6.5 times; the both adsorption performance is basically the same; while the morphology are micron and nanometer scale multi-level structure of the interface microspheres; BET characterization Gd-TiO 2 microspheres doped TiO 2 micro ball in the specific surface area of ??185 m 2 / g; dominated both polymorphs mainly anatase, the ratio were 73% and 85%; doped Gd-TiO < sub> 2 microspheres the TiO 2 the microspheres FT-IR-peak OH bond and surface hydroxyl groups. 3, TiO 2 microsphere degradation of endocrine disrupting chemicals - bisphenol A single factor results show: When the catalyst concentration of 4 g / L, and the superficial gas velocity Ug = 8.34 × 10 -3 m / s, superficial liquid velocity Ul = 8.34 × 10 -3 m / s, the handling capacity of 1800 ml, the initial bisphenol A concentration of 10 mg / L, The degradation rate of 94%; by response surface methodology degradation model equation: y = 94.44 5.70x -0.084x 2 -0.18x , < / sub>-2.48x 1 x 2 2.64x 1 x 3 -13.64x 1 < / sub> 2 -2.42x 2 2 -3.99x 3 2 further optimize the the best degradation process: the catalyst dosage Cs = 4.5 g / L, the superficial gas velocity Ug = 7.83 × 10 -3 m / s and superficial liquid speed Ul = 8.62 × 10 -3 m / s, this condition TiO 2 microspheres bisphenol A degradation rate reached 95.1%, while under the same conditions of Gd-TiO 2 microsphere degradation of bisphenol A degradation rate of up to 99%. 4, Gd-TiO 2 to reuse experimental microsphere degradation of bisphenol A: Repeat three times after the catalyst degradation efficiency changed little, roughly about 5% in the material has reusability application in practical applications. Therefore mesoporous TiO 2 microspheres and Gd-TiO 2 microspheres with good settling properties, high photocatalytic activity as a photocatalyst in gas - liquid - solid circulating processing endocrine disruptor bisphenol A slurry photocatalytic reactor has a better application prospects.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization > Additives
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