Synthesis and characterization of visible light responsive titanium dioxide from titanium oxalate complex and their photocatalytic study

經由草酸鈦錯合物製備的具可見光反應的二氧化鈦光觸媒之合成、光反應效率以及鑑定

張光德(Truong, Quang Duc)

指導教授 ： 凌永健

國立清華大學/理學院/化學系/碩士(2009年)

https://doi.org/10.6843/NTHU.2009.00305

摘要

This dissertation includes the review on recent progress of water-soluble titanium complex and its applications for synthesis of nanoparticles titanium dioxide (TiO2). New oxalato bridged titanium complex was synthesized and its structure was determined by Raman, 13C NMR, TGA. Nanocrystalline TiO2 powders were prepared from titanium oxalate complex by various methods. Anatase and rutile phase TiO2 could be selectively synthesized by tailoring the pH of medium. Anatase/brookite composite were obtained by hydrothermal treatment of titanium complex solution at high pH. FeTiO3/TiO2 composite was synthesized by chemical route using titanium oxalate. Crystalline phase and composition of the mixtures were characterized by XRD and Raman analysis. Effect of synthesis condition to morphology of particles was identified by SEM and TEM. The optical property was characterized by diffuse reflectance spectroscopy. The obtained particles are highly visible light absorption and their photocatalytic activity was evaluated by formic acid degradation and photoreduction of carbon dioxide. The highest activity corresponded to the powder consisting of two crystalline phase. By using both oxidation and reduction reaction, the mechanism of junction effect was clarified and demonstrated.

關鍵字

titanium dioxide ； visible light response ； titanium oxalate complex ； photocatalyst

參考文獻

(1) J. H. Braun, J. Coat. Technol. 1997, 69, 59.

(2) T. Horio, Fragrance J. 1991, 19, 15.

(5) A. L. Linsebigler, G. Lu, J. T. Yates, Chem. Rev. 1995, 95, 735.

(6) M. Schneider, A. Baiker, A. Catal. Rev. Sci. Eng. 1995, 37, 515.

(7) Y. Zheng, E. Shi, Z. Chen, W. Li, X. Hu, J. Chem. 2001, 11, 1547.