銀和硼摻雜於二氧化鈦奈米光觸媒之光催化特性探討

Investigation on the photocatalytic characteristics of Ag and B doped TiO2 nanophotocatalysts

張立澒(Li-Hung Chang)

指導教授 ： 卓君珮

國立暨南國際大學/科技學院/光電科技碩士學位學程/碩士(2014年)

摘要

銀摻雜二氧化鈦奈米粒子有助於可見光吸收，同時銀粒子在二氧化鈦表面也扮演電子接收器的角色，可促進光降解反應，然而過量的銀粒子沉積會使二氧化鈦表面積下降，增加電子電洞再結合的機率，導致光催化活性降低。本研究除了探討不同濃度的銀摻雜對於二氧化鈦光催化活性的影響，為了避免過量的銀粒子沉積，我們還在銀摻雜之後以不同濃度之硝酸溶液對二氧化鈦進行表面處理，藉此探討不同的銀粒子清除程度對於二氧化鈦光催化活性的影響。此外，我們也發現燒結次數會影響二氧化鈦之光催化活性，經由二次燒結方式所製備出同時具有金紅石相與銳鈦礦相且有適量銀摻雜的二氧化鈦光觸媒具有最優異的光催化活性。本研究也製備了硼摻雜二氧化鈦奈米粒子，並與銀摻雜二氧化鈦比較光催化活性，雖然硼摻雜二氧化鈦已具有不錯的光降解效率，但其光催化活性還是遜於銀摻雜二氧化鈦光觸媒。

關鍵字

二氧化鈦 ； 奈米光觸媒 ； 銀摻雜 ； 光催化 ； 光降解 ； 硼摻雜

並列摘要

Ag-doped TiO2 nanoparticles helps absorb visible light, while the surface of the silver particles in TiO2 also plays the role of electronic receivers, can promote the photodegradation reaction, but an excess of silver particles depositing TiO2 surface area will decrease, increasing the electron-hole re-combined probability of binding, resulting in reduced photocatalytic activity. This study investigated for different concentrations of silver doped TiO2 photocatalytic activity, in order to avoid excessive deposition of silver particles, then we are still silver doped with different concentrations of nitric acid solution for surface treatment of TiO2, thereby explore different Clear the extent of silver particles of TiO2 photocatalytic activity. In addition, we also found that the number of firing would affect the photocatalytic activity of TiO2, prepared by sintering a secondary both anatase and rutile phase and have the right amount of silver doped TiO2 photocatalyst has the most superior photocatalytic activity. The study also prepared boron-doped TiO2 nanoparticles and compare the photocatalytic activity of TiO2 doped with silver, although boron-doped TiO2 already has a good photodegradation efficiency, but it is still inferior to the photocatalytic activity of silver-doped TiO2 photocatalyst .

並列關鍵字

TiO2 ； nanophotocatalyst ； Ag doped ； photocatalysis ； photodegradation ； B doped

參考文獻

1. S. E. Jorgensen and B. Fath, Encyclopedia of Ecology (2008).

2. A. Fujishima and K. Honda, Electrochemical Photolysis of Water at a Semiconductor Electrode, Nature, 238, 37(1972).

3. S. N. Frank and J. Bard, Heterogeneous Photocatalytic Oxidation of Cyanide Ion in Aqueous Solutions at TiO2 powder, J. Am. Chem. Soc. 99, 303 (1997).

4. C. D. Valentin, G. Pacchioni, A. Selloni, S. Livraghi and E. Giamello, Characterization of Paramagnetic Species in N-Doped TiO2 Powders by EPR Spectroscopy and DFT Calculations, J. Phys. Chem. B. 109, 11414 (2005).

5. X. Chen and C. Burda, The Electronic Origin of the Visible-Light Absorption Properties of C-, N- and S-Doped TiO2 Nanomaterials, J. Am. Chem. Soc. 130, 5018 (2008).