Preparation and Characterization of Porous Photocatalyst TiO2 and Its Application

• Main Authors: WEN- HSIEN HSU, 許文賢
• Other Authors: Yu-Li Yeh
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/68084746919594102552

碩士 === 明新科技大學 === 化學工程與材料科技系碩士班 === 101 === Photocatalyst has been extensively studied due to the rising of environmental consciousness. Titanium dioxide (TiO2), which is excited by photocatalytic reaction, will result in a high oxidation activity of free radicals, so that electron - hole pairs are with the properties such as being easy to restore. This property is not only efficient in treatment of wastewater but also having a good effect on sterilization, disinfection. Therefore , Titanium dioxide is widely applied to self-cleansing, wastewater treatment, sterilization, and environmental protection. Titanium dioxide (TiO2) in the wastewater can perform the photocatalytic reaction to achieve the effectiveness of removing organic pollutants. According to the analyzed data, by addition the surfactants to TiO2 to increase the surface volume should be able to improve its performance. This not only can be a potential way to resolve the problem of environmental pollution, but also offers better access to higher economic benefits. Therefore, more and more people start focusing on the photocatalyst research related to photocatalytic properties for the purpose of manufacturing the titanium dioxide composite particles with photocatalytic property; or increasing the TiO2 surface-active position to improve its efficiency. This research consists of two parts. The first part is the preparation of porous photocatalyst (TiO2) .Then analyzed the crystalline phases of porous photocatalyst TiO2 composition with XRD (X-ray diffraction), its surface structure with Scanning Electron Microscopy (SEM), and the specific surface area with BET. The second part is the comparison of wastewater treatment efficiency between the produced porous TiO2 and the commercially available nano-TiO2 for the treatment of the dye (FBL) (Everdirect supra turguoise blue) wastewater. The efficiency of wastewater treatment was decided by analyzing ADMI (American Dye Manufacturers Institute) and TOC(Total Organic Carbon) which show the true chroma and total organic carbon content of FBL. The XRD characteristic peak shows the produced porous photocatalyst TiO2 of adding surfactants or magnetic is anatase crystalline phase. The different produced porous photocatalyst TiO2 particle sizes can be seen through SEM, about 2 μm (adding (C4H6O2)n), 0.8 m (adding C18H34O2), and 0.16 μm（adding Ni Zn-Ferrite）. It is also found that specific surface areas of porous photocatalyst detected by the BET are approximately 49.7557 (m2/g)( adding C18H34O2), 162.5595 (m2/g)(adding (C4H6O2)n) , 71.7435(m2/g)（adding Ni Zn-Ferrite）. The specific surface areas of commercially available TiO2 are 176.717 (m2/g) (7nm) and 11.3019 (m2/g) (20 nm) respectively. The photocatalytic reaction experiment shows that, using the photocatalyst by adding a magnetic particle to treat the dye wastewater containing 100 ppm of COD, the COD and TOC removal efficiency reach 94.82%, the ADMI removal efficiency can be as high as 98.61%.