本論文發表了利用光敏劑以及鍍上鉑金屬的二氧化鈦(Pt/TiO2),來光催化降解鹵代有機化合物的研究。我們利用Pt-3,3’(dcpy)Cl2 和1,2-benzenedithiol 在室溫下反應製備出所使用的染料Pt(3,3’-dcpy)(bdt);此染料已用NMR(1H、13C)、FTIR、高解析質譜儀(HR-FAB)及元素分析來進行鑑定。光降解反應時,將吸附染料的鍍鉑二氧化鈦(Pt/TiO2/Pt(bdt))加入二氯甲烷水溶液中,以中心波長為419 nm的可見光照射,並定時取樣由GC及NMR檢測其降解反應。並以不同取代的此種染料Pt(3,3’-dcpy)(bdt)和Pt(4,4’-dcpy)(bdt)在光降解效率上做比較。結果發現Pt(3,3’-dcpy)(bdt)無論在各種基質降解效率上都優於Pt(4,4’-dcpy)(bdt)。我們推測原因為Pt(3,3’-dcpy)(bdt)因為立體障礙導致分子結構扭曲產生的效應,文中以UV吸收光譜、螢光放射光譜及電化學對其進行探討。
Photocatalytic degradation of halogenated compounds using photosensitizer and platinized TiO2 (Pt/TiO2) has been investigated. The Pt-based photosensitizer Pt(3,3’-dcpy)(bdt) (dcpy = dicarboxyl-2,2’-bipyrindine, bdt = 1,2-benzenedithiolate) was prepared by reacting Pt-3,3’(dcpy)Cl2 with 1,2-benzenedithiol in THF/H2O (V/V = 1/1) at room temperature. The dye [Pt(3,3’-dcpy)(bdt)] has been characterized by NMR( 1H、13C)、FTIR、HR-FAB and EA. Pt/TiO2/ Pt(3,3’-dcpy)(bdt) powder which was prepared by immersing the Pt/TiO2 nanoparticle in the Pt(3,3’-dcpy)(bdt)-containing DMSO solution for 24 hours and then recovered the dried particles was added in CH2Cl2-containing aqueous solution, under visible light irradiation (λ = 419 nm) lead to the dechlorination of CH2Cl2 and analysis by GC and NMR. We compared the efficiency between two differently disubstituted bipyridine-containing dyes, ,which are Pt(3,3’-dcpy)(bdt) and Pt(4,4’-dcpy)(bdt), in the photocatalytic degradation of halogenated compounds under the visible light irradiation. We found that Pt(3,3’-dcpy)(bdt) has a better efficiency than Pt(4,4’-dcpy)(bdt) in visible light-driven photodegradation,, and used UV-Vis、PL and CV to explain the possible mechanism.