| Summary: | 碩士 === 國立屏東科技大學 === 環境工程與科學系所 === 104 === PCBs are one kind of high stability pollutants in the natural environment and hard to be biodegraded. PCBs have created serious contamination in the environment. Many studies have been used to design and fabricate TiO2 photocatalyst with highly photocatalytic efficiency. Among the various researches, there are two efforts which could enhance the performance of photocatalysts. One approach is to fabricate special morphological TiO2 photocatalyst. The other approach uses metals or non-metallic doping. For the fabrication, biotemplate method has been demonstrated to be very effective in synthesizing special materials without complex preparation. Thus, in this study, the synthesis of porous-TiO2 and TiO2 hollow spheres by using yeast cell as bio-template was studied. To further explore the treatment of methylene bule and PCBs aqueous solutions, the porous-TiO2 and TiO2 hollow spheres were compared.
The results of XRD analysis were used to compare the JCPDS authentication database for Porous TiO2 in this study. The crystal types not only include anatase and rutile but also carbon peak. The SEM results, Yeast template is a major factor to form the porous structure and hollow microspheres. EDS elemental analysis proved yeast not only used as template but also as carbon dopants for TiO2. BET results using yeast as bio-template to synthesis porous TiO2 show the increase of 85% ~ 108% of the surface area. Degradation percentages for Porous-600 of methylene bule were 95% under natural sunlight after 1 hour. It is a kind of synergism, which is resulted from the increased of BET surface area that can provide more reactive sites and carbon doped of higher electron–hole pair separation efficiency compared to pure TiO2. At last, using the best experimental factor to study the degradation of PCBs. At last, using the best experimental factor to study the degradation of PCBs. The degradation percentage was 51% and microtox inhibition percentage dropped by 12.1% after the photocatalysis. Durability experiment confirmed that self-prepared catalysts in this study can be economically benefitial for the applications of environmental protection studies.
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