Modeling of photocatalytic degradation of organic pollutants with immobilized semiconductor catalyst

• Main Author: 賴肇國
• Other Authors: 徐永錢
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/09986238731702631022

碩士 === 國立臺灣科技大學 === 化學工程技術研究所 === 87 === 　　In present investigation, the following achievements were considered to have been successfully attained. 　　1.Catalyst immobilization 　　2.High efficiency reactor construction 　　3.Mathematical model derivation and verification 　　According to the modified reaction mechanism as reported by Peng et al(1997;1998), we derived a mathematical model to describe the photocatalytic oxidation reaction. The model has been successfully in predictiong all the phenomena or consequences in the literature cited as well as the experimental results. Furthermore, by considering the various operational conditions, this mathematical model still can be simplified as listed in Table A-1. 　　We have also recognized that the mineralization of organic pollutants proceeded merely in aqueous solution not following the traditional Langmuir-Hinshelwood adsorption model. This model has predicted and has been verfied that: 　　1.Under high light intensity, the light intensity is half order with respect to the reaction rate (Models Ⅰ、Ⅲ、Ⅰa、and Ⅲa), results being highly consistent with the cited and experimental values. 　　2.Under low light intensity, the light intensity is first order with respect to the reaction rate (Models Ⅱ、Ⅳ、and Ⅴ), results also being highly consistent with the cited and experimental values. 　　3.No matter under high or low light intensity, provided the concentration is enough low, the concentration is first order with respect to the reaction rate (Model Ⅱ、Ⅲ、Ⅴ、and Ⅲa). The results were also highly consistent with the cited values. 　　To summarize, this investigation has already accomplished some innovative theories and technologies as follows: 　　New catalyst technology 　　New reactor development 　　New photocatalytic reaction mechanism 　　New mathematical model derivation and verification