Treatment of Methylene Blue and Escherichia Coli by Using Titanium Dioxide Photocatalyst Dopping with Cattle Dung Pyrolytic Carbon/Silver

• Main Authors: LIN, ZHE-AN, 林哲安
• Other Authors: LO, TSUI
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/ubbwg9

碩士 === 明志科技大學 === 環境與安全衛生工程系環境工程碩士班 === 106 === Utilizing the characteristics that cattle dung manure contains nitrogen, a novel dopant material was used to prepare pyrolytic carbon and serve as a support for titanium dioxide. The titanium dioxide photocatalyst was synthesized by sol-gel method. Besides, additional silver-doped titanium dioxide photocatalysts was also synthesized. The produced photocatalysts were evaluated by the methylene blue photodegradation experiment and the E. coli antibacterial experiment, and the effect of different doping ratios on the photocatalytic degradation ability was study. The prepared photocatalysts were respectively analyzed for their ash content, elemental analysis (EA), specific surface area (BET), scanning electron microscope (SEM), X-ray diffraction analyzer (XRD) and Fourier transform infrared spectrometry (FTIR) to understand the characteristics of the samples. The results show that the incorporation of cow dung into titanium dioxide photocatalysts facilitates photocatalytic reactions under visible light. The photocatalyst incorporating 3% of cow dung carbon (Ti-3% C) showed the best methylene blue degradation efficiency, achieving 66.67% methylene blue removal rate within 6 hrs. The E. coli antibacterial efficiency reached 100% within 90 mins. However, excessive doping of cattle dung pyrolytic carbon reduced the photocatalytic effect, indicating that an optimal proportion of doping ratio existed. The photocatalytic reaction of co-doping silver photocatalyst could also be performed under visible light. Degradation efficiency of methylene blue was 81.33% in 6 hrs, while the antibacterial efficiency in E. coli could reach 100% efficiency in dark environment. However, co-doping both cow dung carbon and silver photocatalyst did not show better methylene blue degradation efficiency when compared with the single-doped Ti-Ag photocatalyst under visible light. The possible reason might be that the co-doping photocatalyst might exceeds the optimal doping ratio.