Adsorption and Reactions of Melamine on Powdered TiO2

• Main Authors: Yu-ChengLin, 林郁丞
• Other Authors: Jong-Liang Lin
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/81410532397617957254

碩士 === 國立成功大學 === 化學系碩博士班 === 101 === Fourier-transform infrared spectroscopy has been employed to investigate the adsorption and reactions of 1,3,5-triazine-2,4,6-triamine (melamine) on powdered TiO2. Melamine on TiO2 is subjected to thermal decomposition, producing surface species of NCO, azide and CN- and/or NH2-containing intermediates under vacuum. In the presence of O2, gaseous CO2 is generated in addition to these surface species. The decomposition temperature of melamine in the presence of O2 or under vacuum is similar, indicating that O2 has negligible effect on the thermal decomposition pathways and kinetics of melamine on TiO2. Photodegradation of melamine on TiO2 generates cyanamide and dicyandiamide. O2 can enhance the melamine photodecomposition rate and further analysis reveals that the molar ratio of cyanamide/dicyandiamide formed is 10.7.