Degradation of Sucrose and Nitrate Over Titania Coated Nano-hematite Photocatalysts |
| |
| Authors: | Penpolcharoen Metta Amal Rose Brungs Michael |
| |
| Institution: | (1) Centre for Particle and Catalyst Technologies, School of Chemical Engineering and Industrial Chemistry, The University of New South Wales, Sydney, NSW, 2052, Australia;(2) Department of Civil Engineering, Mahanakorn University of Technology, Nong-Chok, Bangkok, 10530, Thailand |
| |
| Abstract: | Photodegradation of sucrose and/or nitrate in aqueous solutions was studied over the titania coated nano-hematite photocatalysts under near-UV irradiation. The efficiency of the photocatalytic oxidation and reduction of these coated particles was compared to the prepared single phase TiO2. It was found that in different environments (O2 or N2) the particles showed differences in the photocatalytic efficiency due to the different reaction mechanisms. Effect of nitrate on sucrose degradation was investigated. In aerobic conditions, sucrose was degraded effectively while nitrate reduction was insignificant due to the fast reoxidation of nitrite by O2 in the dark and by OH. in homogeneous reaction. Since nitrite competes with sucrose for hydroxyl radicals, it has an adverse effect when the aerobic system contains both substrates. Since reoxidation was suppressed in N2 conditions, greater reduction of nitrate was observed. The result showed clearly that in the absence of O2, CO2 production from sucrose mineralisation was limited by the amount of oxygen produced from the nitrate decomposition. Partial photodissolution of Fe ions for the coated samples was also observed in both environments. |
| |
| Keywords: | photocatalysis titanium dioxide hematite iron oxide sucrose nitrate reduction |
| 本文献已被 SpringerLink 等数据库收录！ |
|
