Preparation of photocatalytic membrane by doping titanium dioxide with waste fluorescent powder of lanthanum

• Main Authors: Szu-Yu Kuo, 郭思妤
• Other Authors: Sheng-Jie You
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/66385823656874325490

碩士 === 中原大學 === 生物環境工程研究所 === 104 === In this study, the waste fluorescence powder used acid leaching to rare earth metal leach out and doped with titanium dioxide (TiO2). This reduced the TiO2 energy gap, making the light source can be changed to visible light from ultraviolet light, which can effectively reduce energy problem. Membrane treatment procedure for the widespread use of the current technology. Literature indicated by photocatalyst coating material was applied on the membrane hydrophilic, it could effectively improve performance and reduced the impact of fouling materials. In this study, the modified PVDF membrane by low temperature plasma and preparation of lanthanum-doped titanium dioxide coated on it. The modified membrane surface properties and photocatalytic reaction which reduced the fouling material and eliminate it. The results showed that in acid leaching, use 5M nitric acid and solid-liquid ratio is 1: 5；1M HNO3 → 5M HNO3 → 5M HCl combination leaching 6 hours can obtained better lanthanum content. Photocatalytic reaction results showed that the amount of additive with 1wt% lanthanum had best additive amount of experiments. It showed lanthanum-doped titanium dioxide the amount exceeds 3wt%, the photocatalytic degradation efficiency tends to be slow. Experimental test different light sources the display blue light was best, and tested for their photocatalyst repeatability results show times can be repeated up to 11 times. One wt% La-TiO2 coated on the membrane, its photocatalytic degradation efficiency of the dye decreased, but still has the ability of photocatalytic. La-TiO2/PVDF membrane is hydrophilic but it lead to increased pressure through the mold.