奈米級含氮二氧化鈦應用於微量汞蒸氣去除之研究

粘聖宏

doi:10.6841/NTUT.2012.00309

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奈米級含氮二氧化鈦應用於微量汞蒸氣去除之研究

Photocatalytic study of nanoscale N-doped TiO2 on low-concentration mercury vapor remova

粘聖宏 , Masters　　Advisor：陳孝行;席行正　　

繁體中文 DOI： 10.6841/NTUT.2012.00309

元素汞蒸氣；含氮二氧化鈦；吸附效率；氧化效率； N-doped TiO2 ； photocatalysis ； elemental mercury ； continuous system

Abstract │ Reference (72) │ Times Cited (1) │ Altmetrics

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

Mercury was identified as one of hazardous air pollutants sourced from coal-fired because of its toxicity and bioaccumulation. The goal of this study was to remove gaseous elemental mercury by prepared N-doped TiO2. The subject was divided into two parts. The first is to prepare nitrogen doped titanium dioxide (TiOxNy) and analyze characteristic of photocatalyst. The second is to test removal efficiency for gaseous elemental mercury by adsorption of TiO2 and TiOxNy under various conditions. (oxygen concentrations, irradiations etc.). Finally the different results of removal efficiency for removal mercury between different catalysts were discussed. 
In first part, the molecular state nitrogen was successfully incorporated into TiO2 by calcination. The particle size of TiOxNy became lager because of high temperature and calcination with ammonia chloride. The FTIR measurement showed there are functional groups on the surface of TiOxNy.
In the second part, the removal efficiency increase with increasing oxygen concentration and imply an enhancement in the presence of light irradiation. The optimum removal efficiency of TiO2 and TiOxNy in 21%O2 condition were 68% and 72% individually and parts in this study. The affection of H2O molecules, was supposed to compete adsorption site with Hg and made a greatly desorption without oxygen under ultraviolet irradiation that decreased Hg0 removal. However doping nitrogen in TiO2 reduced proportions of desorption, and was attributed the chemical bonding to functional groups on catalyst surface. The adsorptive reaction of Hg at 50℃ was worse than at 25℃,and no efficiency at 100℃. This result indicated the Hg0 removal decreased with increasing temperature of reaction. 
The flue gases (NO, SO2 and HCl) were found an inhibitory effect on Hg0 removal over catalyst due to the competition of flue gases with Hg0 for the adsorption sites and radicals.

Reference ( 72 ) 〈TOP〉

1. Innanen, S., The ratio of anthropogenic to natural mercury release in Ontario: Three emission scenarios. Science of the Total Environment, 1998. 213(1-3): p. 25-32.
連結：
2. Hsu, B.C., Chen, S. S.,Su, C.,Liu, Y. T., Preparation and characterization of nitrogen-doped titanium dioxide. Journal of Nanoscience and Nanotechnology, 2007. 7(9): p. 3104-3110.
連結：
3. Pacyna, E.G., J.M. Pacyna, and N. Pirrone, European emissions of atmospheric mercury from anthropogenic sources in 1995. Atmospheric Environment, 2001. 35(17): p. 2987-2996.
連結：
5. Global mercury assessment, 2002, UNEP Chemicals.
連結：
7. Galbreath, K.C. and C.J. Zygarlicke, Mercury transformations in coal combustion flue gas. Fuel processing technology, 2000. 65: p. 289-310.
連結：

Times Cited (1) 〈TOP〉

潘郁采(2013)。利用含碳二氧化鈦光催去除微量氣態元素汞之研究。臺北科技大學環境工程與管理研究所學位論文。2013。1-150。

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