Preparation and Activities of TiO2-PVDF Composite Thin Film Photocatalyst

• Main Authors: HUANG, YU-QI, 黃裕琦
• Other Authors: HUNG, CHUNG-HSUANG
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/gq83qa

碩士 === 國立高雄第一科技大學 === 環境與安全衛生工程系碩士班 === 106 === In this study, the TiO2-PVDF photocatalyst thin films made from compositing both titanium dioxide (TiO2-PVDF) and polyvinylidene difluoride (PVDF) together by an immersion-precipitation method were applied as photocatalysts for water purification. PVDF has many superior characteristics including high plasticity, low mechanical resistance, good chemical resistance, high flexibility, and various thicknesses of thin films available for various applications. PCDF can be cut into various sizes and shapes. PVDF also has the advantages of high temperature resistance, oxidation resistance, weather resistance, and radiation resistance. Thus, The TiO2-PVDF composit thin film photocatalysts were prepared and applied in this study. Accordingly, this study aimed to prepare TiO2-PVDF composite thin-film photocatalysts, co-doped by carbon nanotubes (CNTs) or graphene (GR), for sulfadiazine (SDZ) removal. SZD is widely used an antibiotic for treating diseases due to the infections of bacteria and protozoa. But SDZ has been also classified as an emerging pollutant that can be potentially harmful to environmental ecology and human health. Thus, the experiments for the photocatalysis of SDZ was conducted in a batch reactor under near ultraviolet (UV, λ = 365 nm) or visible blue light (LED, λ = 470 nm). The experimental results demonstrated that the prepared porous TiO2-PVDF, TP-G and TP-C composite thin-film photocatalysts had good photocatalytic capabilityies for SDZ removal. The photocatalysis of SDZ follows the first-order reaction kinetics. The titanium dioxide photocatalyst doped with 2.0% graphene has the highest photocatalytic activity (kUV = 0.354 hr-1, kLED = 0.042 hr-1), followed by a catalyst that is doped with 2.0% carbon nanotubes (kUV = 0.348 hr-1, kLED = 0.040 hr-1), and the slowest SDZ dehrdation rate is by TiO2-PVDF (kUV = 0.018 hr-1, kLED = 0.024 hr-1). In general, SDZ degraded fast in acidic conditions. The doping of nanomaterials not only can increase the activity of TiO2 under near-UV light, but also promote its photocatalytic activity while using LED blue ligh as a ligh source.