A kinetic model based on non-linear regression analysis is proposed for the degradation of phenol under UV/solar light using nitrogen doped TiO2

作者：Devi L Gomathi^*; Rajashekhar K Eraiah

来源：Journal of Molecular Catalysis A: Chemical , 2011, 334(1-2): 65-76.

DOI：10.1016/j.molcata.2010.10.025

• Nitrogen doped TiO2
• Ammonium persulfate
• Kinetic/mathematical modeling
• Phenol degradation

Nitrogen was doped into the TiO2 matrix in the concentration range of 0.05-0.20 at.% and the photocatalytic activities were tested for the degradation of phenol (Ph) under UV/solar light using hydrogen peroxide (HP) and ammonium persulfate (APS) as electron acceptors. The prepared photocatalysts characterized by various analytical techniques confirm the incorporation of nitrogen in the TiO2 lattice. The 0.15 at.% dopant concentration shows higher photocatalytic activity compared with sol-gel TiO2 (SG) and Degauss P25 TiO2 (P25) for the degradation process. Photoluminescence technique was used for studying the extent of hydroxyl radicals produced on TiO2 and TiO2-xNx (NT) surface in the presence of oxidants under UV/solar light irradiation. The kinetic rate equation obtained for the best system TiO2-xNx (x = 0.15 at.%)/APS/under solar irradiation is found to be: r(ap.solar) = 0.0041[NT](0.54)[APS](0.71)[Ph](0.70). kinetic/mathematical model was developed based on the nonlinear regression analysis for the various processes and the validity of the model was tested by comparing the experimental values with the theoretically calculated data as a function of variable parameters like catalyst dosage, concentration of electron acceptors and initial concentration of Ph.

• 出版日期2011-1-4