Chemical absorption process for degradation of VOC gas using heterogeneous gas-liquid photocatalytic oxidation: toluene degradation by photo-Fenton reaction.
Chemical absorption process for degradation of VOC gas using heterogeneous gas-liquid photocatalytic oxidation: toluene degradation by photo-Fenton reaction.
复制标题
DOI：
10.1016/j.chemosphere.2008.06.021
复制
发表时间：
2008-10
期刊：
影响因子：
8.8
通讯作者：
M. Tokumura;Rina Nakajima;H. Znad;Y. Kawase
中科院分区：
文献类型：
--
作者：
M. Tokumura;Rina Nakajima;H. Znad;Y. Kawase
研究了一种多相气液光催化氧化降解气相甲苯的新工艺。实验研究了液相光Fenton反应降解甲苯废气的效果。液相中的光Fenton反应通过增加传质驱动力，提高了甲苯的吸收速率，从而提高了废气中甲苯的去除率。入口气体中的甲苯浓度在0.0968至8.69gm− 3的范围内变化，初始过氧化氢浓度为400 mgl − 1，Fe剂量为5.0mgl−1。发现对于小于0.42gm-3的入口甲苯气体浓度，入口气体中的甲苯几乎完全溶解于水中并且在液相中降解。研究了光Fenton反应降解甲苯气体的动力学过程，为反应动力学和传质速率提供了依据。甲苯去除动力学分析表明，H2 O2浓度对光-Fenton降解有显著影响。采用简化的串联模型结合甲苯脱除动力学分析对实验结果进行了预测，结果令人满意。研究结果表明，光-Fenton非均相气-液光催化氧化化学吸收法对挥发性有机气体的降解是非常有效的。
A novel process for degradation of toluene in the gas-phase using heterogeneous gas–liquid photocatalytic oxidation has been developed. The degradation of toluene gas by photo-Fenton reaction in the liquid-phase has experimentally examined. The photo-Fenton reaction in the liquid-phase could improve the overall toluene absorption rate by increasing the driving force for mass transfer and as a result enhance the removal of toluene in the exhaust gas. The toluene concentrations in the inlet gas were varied in the range from 0.0968 to 8.69gm−3with initial hydrogen peroxide concentration of 400mgl−1and Fe dose of 5.0mgl−1. It was found that toluene in the inlet gas was almost completely dissolved into water and degraded in the liquid-phase for the inlet toluene gas concentration of less than 0.42gm−3. The dynamic process of toluene gas degradation by the photo-Fenton reaction providing information for reaction kinetics and mass transfer rate was examined. Toluene removal kinetic analysis indicated that photo-Fenton degradation was significantly affected by H2O2concentration. The experimental results were satisfactorily described by the predictions simulated using the simplified tanks-in-series model combined with toluene removal kinetic analysis. The present results showed that the proposed chemical absorption process using the photo-Fenton heterogeneous gas–liquid photocatalytic oxidation is very effective for degradation of volatile organic gases.