金屬有機骨架於光催化反應之應用

本研究主要是探討利用具有不同的中心金屬及能隙的金屬有機骨架作為光催化劑，來進行染料光分解反應。本實驗所使用的染料為甲基橙、甲烯基藍，使用的光源分別為紫外光及可見光。紫外光部分是固定染料及金屬有機骨架的濃度進行光催化降解實驗，可見光部分是藉由改變催化劑濃度與染料濃度進行光催化降解實驗，利用紫外光-可見光吸收光譜特徵峰變化，在同一催化劑下利用不同初始濃度來觀察降解能力的差異或利用不同的催化劑在相同初始濃度下來探討其降解變化，並討論不同中心金屬離子及配位基對催化效果的影響。一般來說造成光催化的原因有電洞、羥基自由基和臭氧，我們可以藉由自由基抑制實驗來驗證造成光催化的因素。本實驗也利用Michaelis–Menten方程式做出Lineweaver-Burk圖並計算出vmax與Km值。我們也利用Michaelis–Menten方程式計算出金屬有機骨架-甲基橙光催化之反應速率常數值，並探討其數值與光催化之關係。詳細之結果將於論文中討論。

關鍵字

金屬有機骨架；光催化；甲基橙；甲烯基藍

並列摘要

This study mainly explored the photolysis of dyes using metal-organic frameworks (MOFs) with different metal centers and band gaps as photocatalysts. Dyes used in this study were methyl orange and methylene blue, while ultraviolet (UV) and visible (VIS) light were used as light sources. Photolysis experiments performed under UV light involved using fixed concentrations of dyes and MOFs, while photolysis experiments performed under visible light involved variable concentrations of dyes and MOFs. Variations in the characteristic peaks of UV-VIS absorption spectra were analyzed. Different initial concentrations of the same catalyst were applied to observe differences in the decomposition ability, while different catalysts with the same initial concentration were applied to examine changes in the decomposition. The influences of different metal ion centers and ligands on the catalytic effect were also explored. Generally speaking, reasons for the occurrence of photocatalysis include electron holes, hydroxyl radicals, and ozone, and the factors causing photocatalysis can be determined through a radical inhibition test. In this study, the Michaelis-Menten equation was adopted to generate Lineweaver-Burk plots, from which vmax and Km values were calculated. Moreover, the Michaelis-Menten equation was also used to calculate the reaction rate constant of MOF-MO photocatalysis, and the relation between its value and photocatalysis was explored. Detailed results are presented and discussed in the article.

並列關鍵字

Metal-Organic Frameworks ； Photocatalysis ； methyl orange ； methylene blue

參考文獻

32. H. Li, M. Eddaoudi, M. O. Keeffe and O. M. Yaghi, “Design and synthesis of an exceptionally stable and highly porous metal-organic framework”,Nature,402, 276–279(1999)

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金屬有機骨架於光催化反應之應用

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