Study on the Photocatalytic Degradation of Azo Dyes over MOF-TiO2/RGO Composites under Simulated Sunlight Reactor

• Main Authors: Qing-Qian Tang, 湯慶謙
• Other Authors: Yung-Hsu Hsieh
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/vdu73f

碩士 === 國立中興大學 === 環境工程學系所 === 106 === Advanced Oxidation Processes (AOPs) as a feasible way to deal with dye wastewater. AOPs use physical and chemical means to degrade pollutants in the water and convert the pollutants to low-toxic or easily decomposable substances. Among them, the photocatalytic reaction is one of the AOPs that is often explored. Titanium dioxide is one of the most representative photocatalyst materials available today. It has the advantages of rich source, low cost, non-toxicity, high stability, strong oxidation and reduction ability, and no harmful substances in the reaction process to avoid secondary pollution. Titanium dioxide also has some shortcomings, such as high energy gap, low porosity and poor adsorption. According to the literature, Metal-organic frameworks (MOFs) possesses such features as high surface area, adjustable framework and adjustable aperture. The use of metal organic framework preparation of titanium dioxide, titanium dioxide in the frame after pyrolysis can still withstand a certain degree of permanent porosity, can demonstrate high contact area, adsorption efficiency and so on. Graphene is the lowest resistivity material in the world and possesses good electrical conductivity and light transmittance. These features make graphene play an electron transfer role in photocatalytic reaction. Promote photocatalytic titanium dioxide electron hole elongated recovery time, to provide better redox ability. In this study, the azo dye Acid Red 27(AR-27) was photocatalytically degraded by the composite MOF-TiO2/RGO. The experimental results show that photodegradation is best under acidic conditions. Addition of graphene at 5 %、10 %、15 %、20 % in the experiment. With the increase or decrease in the proportion did not increase but the best effect at 10%. The study also tried to use inorganic salts as a competitor and found that there is a certain degree of impact.