Vinu R, Madras Giridhar
Department of Chemical Engineering, Indian Institute of Science, Bangalore, 560012, India.
Environ Sci Technol. 2009 Jan 15;43(2):473-9. doi: 10.1021/es8025648.
The current research work focuses on the combination of photocatalytic and sonocatalytic (sonophotocatalytic) degradation of anionic dyes, viz., Orange G, Remazol Brilliant Blue R, Alizarin Red S, Methyl Blue, and Indigo Carmine, with solution combustion synthesized TiO2 (CS TiO2) and commercial Degussa P-25 TiO2 (DP-25). The rate of sonophotocatalytic degradation of all the dyes and the reduction of total organic carbon was higher compared to the individual photo- and sonocatalytic processes. The effect of dissolved gases and ultrasonic intensity on the sonophotocatalytic degradation of the dyes was evaluated. A dual-pathway network mechanism of sonophotocatalytic degradation was proposed for the first time, and the rate equations were modeled using the network reduction technique. The kinetic rate coefficients of the individual steps were evaluated for all the systems by fitting the model with experimental data.
当前的研究工作聚焦于利用溶液燃烧合成的TiO₂（CS TiO₂）和商用德固赛P-25 TiO₂（DP-25），对阴离子染料（即橙黄G、雷马素亮蓝R、茜素红S、甲基蓝和靛蓝胭脂红）进行光催化和声催化（声光催化）降解的联合研究。与单独的光催化和声催化过程相比，所有染料的声光催化降解速率以及总有机碳的减少量更高。评估了溶解气体和超声强度对染料声光催化降解的影响。首次提出了声光催化降解的双途径网络机制，并使用网络简化技术对速率方程进行了建模。通过将模型与实验数据拟合，评估了所有体系中各个步骤的动力学速率系数。
