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シリカゲル担持金属ポルフィインの可視光殺菌効果
http://hdl.handle.net/10458/1686
http://hdl.handle.net/10458/168664b78785-33c7-465f-84f8-e6bde99e73e5
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
FuedaYoshiyuki.pdf (3.1 MB)
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| Item type | 学位論文 / Thesis or Dissertation(1) | |||||
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| 公開日 | 2008-12-08 | |||||
| タイトル | ||||||
| タイトル | Photocatalytic bactericidal effect of silica gel-supported metalloporphyrin complexes | |||||
| 言語 | en | |||||
| タイトル | ||||||
| タイトル | シリカゲル担持金属ポルフィインの可視光殺菌効果 | |||||
| 言語 | ja | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_46ec | |||||
| 資源タイプ | thesis | |||||
| 著者 |
笛田, 佳之
× 笛田, 佳之× Fueda, Yoshiyuki |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | This thesis on "Photocatalytic bactericidal effect of silica gel-supported metalloporphyrin complexes" is summarized as follows: Chapter 1 dealt with a silica gel-supported dihydroxo(tetraphenylporphyrinato)antimony(V) complex (SbTPP/Si02), which operated a bactericidal agent under visible light irradiation. The SbTPP/Si02 particles irradiated by fluorescent light in a test tube induced remarkable bactericidal activity for E. coli cells. The bactericidal activity of the SbTPP/Si02 was affected by both the concentration of the SbTPP/Si02 and the light intensity. Under irradiation by visible light, the SbTPP/Si02 photocatalyst showed much superior bactericidal activity to the commercially available Ti02. Moreover, under irradiation by sunlight, bactericidal activity of the SbTPP/Si02 was observed, and the bactericidal effect of the SbTPP/Si02 particles was effective for continuous treatment on a column photoreactor under fluorescent-light irradiation. Chapter 2 dealt with the bactericidal effect of SbTPP/Si02 on Legionella species. Experiment to reduce concentrations of Legionella species were performed using a cylindrical SbTPP/Si02-photocatalytic bactericidal apparatus in a cooling tower which held 800 dm3 of water. After 10 days, the concentrations of Legionella species were reduced to less than the detection limit, and these levels were kept until the irradiation was stopped. Also, a photocatalytic bactericidal experiment was conducted with a fountain that was filled with 13 m3 of water. The concentrations of Legionella species were reduced to less than the detection limit 12 days after the SbTPP/Si02 catalyst was installed in the fountain receiving sunlight irradiation. The concentrations of Legionella species were kept at less than 30 CFU/lOOml for 3 months until the catalyst was removed from the fountain. Thus, visible-light irradiation of the SbTPP/Si02 catalyst induced a remarkable bactericidal activity against Legionella species in the living environment. Chapter 3 dealt with dihydroxo- and dimethoxo(tetraphenylporphyrinato)phosphorus(V) complexes ([P(OR)2TPPt) immobilized on silica gel ([P(OR)2TPP]/Si02). In the case of [P(OHhTPP]/Si02, the amount of E. coli decreased linearly versus the irradiation time, showing that the bactericidal reaction obeyed zero-order kinetics. Adsorption of bacteria on the catalyst is thought to be a key pathway by analysis according to Michaelis-Menten's equation. [P(OMe)2TPP]/Si02 was more effective for sterilization than [P(OMe)2TPP]/Si02. Stabilities of the [P(ORhTPP]+ immobilized on silica gel beads were investigated in aqueous CaCh and NaCI solutions. The elution of the [P(OH)2TPPt chromophore from complex [P(OH)2TPP]/Si02 was faster than it was from [P(OMe)2TPP]/Si02. The catalyst [P(OMeh TPP]/Si02 with high stability and non-toxicity showed remarkable bactericidal activity towards E. coli under visible light irradiation. In conclusion, the author has considered visible light driven bactericidal effect of silica-gel supported metalloporphyrin complexes (MTPP/Si02) for E. coli and Legionella species from fundamental and practical stand points of view. As the results, the author have elucidated that the present bactericidal technique has the following unique features. 1) Silica gel is most suitable for visible light-driven catalyst support because silica gel is transmitted visible light effectively and immobilize porphyrin chromophores. Also, Si02 is easy to control the surface area, the pore volume, and the pore diameter which the attributes of these porphyrin complexes are required. 2) SbTPP and PTPP had high affinity with microorganisms owing to their cationic complexes. 3) The sterilization was able to be performed under the visible light irradiation. 4) Antimony porphyrin complex and phosphorous porphyrin complex had visible light-driven bactericidal effect. The bactericidal effect was mainly attributed to singlet oxygen 102 which was generated by energy transfer from the excited triplet state ofMTPP (M= Sb, P) to O2. 5) Since the toxicity of SbTPP and PTPP are low, we can use safety these catalysts in living environmental fields. |
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| 言語 | en | |||||
| 内容記述 | ||||||
| 宮崎大学大学院工学研究科博士論文 | ||||||
| 内容記述 | ||||||
| ja | ||||||
| 著者版フラグ | ||||||
| 出版タイプ | AM | |||||
| 出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||
