Chemical Engineering Department, University of Murcia, 30071, Murcia, Spain.
Chemical Engineering Department, University of Murcia, 30071, Murcia, Spain.
J Environ Manage. 2016 Dec 1;183(Pt 3):818-825. doi: 10.1016/j.jenvman.2016.09.033. Epub 2016 Sep 19.
Most photoprocesses follow a pseudo first order kinetic law and, commonly, the kinetic parameter depends on the initial concentration of the substrate. In this work, a kinetic model, which explains this dependence on the substrate concentration and on the other operational variables, has been developed. In the model, mass transfer of substrate from the bulk solution to the wall of the photoreactor was assumed as the step determining the rate of the process. To check the model, methylene blue (MB) has been used as model substrate and photodegradation experiments have been carried out in an exciplex KrCl flow-through photoreactor, It was observed that the methylene blue conversion improved with a decrease in its initial concentration, in good agreement with the model. Also, by fitting the experimental data to the model, high correlation coefficients and a high degree of agreement between experimental and calculated conversion was obtained, which validates the model.
大多数光化学反应遵循拟一级动力学规律，通常，动力学参数取决于底物的初始浓度。在这项工作中，开发了一种动力学模型，该模型解释了底物浓度和其他操作变量对其的依赖性。在该模型中，假定从主体溶液向光反应器壁的底物传质是决定过程速率的步骤。为了检验该模型，使用亚甲蓝（MB）作为模型底物，并在激基复合物 KrCl 流动式光反应器中进行了光降解实验。结果表明，与模型一致，随着亚甲蓝初始浓度的降低，其转化率提高。此外，通过将实验数据拟合到模型中，获得了高相关系数和实验与计算转化率之间的高度一致性，从而验证了该模型。
