Mathematical model of a photocatalytic fiber-optic cable reactor for heterogeneous photocatalysis
Mathematical model of a photocatalytic fiber-optic cable reactor for heterogeneous photocatalysis
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DOI：
10.1021/es960874e
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发表时间：
1998-02-01
影响因子：
11.4
通讯作者：
Hoffmann, MR
中科院分区：
文献类型：
--
作者：
Peill, NJ;Hoffmann, MR
一个基本的数学模型来描述一个单一的化合物在光纤束阵列光催化间歇式反应器（OFR）的降解，使用Langmuir-Hinshelwood动力学表达式。一个经验的全球量子效率，φ（全球），它结合了反应参数，如吸收的光强度，固有速率常数，吸附的反应物的浓度，和反应中间体被用作拟合参数。描述涂覆光纤内的辐射场的经验项是通过实验得出的，并通过光纤涂层内的光催化剂颗粒浓度进行归一化，以解释在吸收光强度和反应量子效率之间观察到的反比关系。的数学模型的结果进行了比较，实验数据中产生的OFR的光催化氧化4-氯苯酚（4CP），五氯苯酚（PCP），和二氯乙酸（DCA）。发现全局量子效率phi（全局）与吸收光强度无关。计算的动力学曲线与实验观察非常吻合。
A basic mathematical model to describe the degradation of a single compound in a fiber-optic bundled array photocatalytic batch reactor (OFR) using a Langmuir-Hinshelwood kinetic expression is developed. An empirical global quantum efficiency, phi(global), that incorporates reaction parameters such as the absorbed light intensity, intrinsic rate constants, concentration of adsorbed reactants, and reaction intermediates is used as a fitting parameter. An empirical term to describe the radiation field within the coated fiber is derived experimentally and normalized by the photocatalyst particle concentration within the fiber optic coating to account for the inverse relationship observed between absorbed light intensity and reaction quantum efficiency. Results of the mathematical model are compared to experimental data generated in an OFR for the photocatalytic oxidation of 4-chlorophenol (4CP), pentachlorophenol (PCP), and dichloroacetate (DCA). The global quantum efficiency, phi(global), was found to be independent of absorbed light intensity. Calculated kinetic profiles are in excellent agreement with experimental observation.