Influences of Electron Scavenger and Conduction Band Position of Photocatalyst on the Degradation of a Pyrimidine Derivative

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Han-Su Lee²  Tak Hur²  Shawn Kim¹  Ho-In Lee² 

[1] BATU Enviro-Tek Inc.;School of Chemical Engineering and Research Center for Energy Conversion and Storage, Seoul National University

关键词: Electron Scavenger;    Photocatalytic Degradation;    Pyrimidine Derivative;    Crystal Structure;    Conduction Band Position;   

DOI  :  10.1252/jcej.37.174

来源: Maruzen Company Ltd

【 摘 要 】

References(18)Cited-By(3)Oxygen and ferric ions were used as electron scavengers in the photocatalytic degradation of a pyrimidine derivative (2-isopropyl-6-methyl-4-pyrimidinol, IMP) in order to elucidate the difference in activity with respect to the crystal structure. Commercial catalyst P-25 was used as-purchased (P-25) and as-calcined at 800°C (calcined P-25). The main crystal structure of P-25 was anatase and that of calcined P-25 was rutile. When oxygen was employed as an electron scavenger, IMP was decomposed easily over P-25 whereas very slowly over calcined P-25. On the contrary, calcined P-25 showed better activity than P-25 when using ferric ion as an electron scavenger. It suggests that rutile can also have good photocatalytic activity under a certain condition. The formation rate of ferrous ions, which are converted from ferric ions along with the reaction, decreased over P-25 with reaction time, but it remained constant over calcined P-25. The result was explained in terms of the adsorption ability of ferrous ions on the catalyst. The CO2 formation rate was slower with the addition of ferrous ion in the degradation of IMP, and anatase adsorbed more ferrous ions than rutile. Ceria impregnation on P-25 lowered the conduction band position to be more positive according to electron energy. Ceria-impregnated P-25 lost its photocatalytic activity in the case of using oxygen as an electron scavenger. However, it showed the same activity as P-25 when ferric ions replaced oxygen. The results proposed that the conduction band position is mainly responsible for the different activities of the crystal structures.

【 授权许可】

Unknown