物理化学学报 >> 2001, Vol. 17 >> Issue (11): 1000-1005.doi: 10.3866/PKU.WHXB20011109

研究论文 上一篇    下一篇

循环流动固定床光催化反应器动力学数学模拟

范山湖;余向阳;湛社霞;陈六平;古喜兰;李玉光;石宗炳   

  1. 中山大学化学与化学工程学院, 中山大学超快激光光谱国家重点实验室,广州 510275; 广州环境保护科学研究所,广州 510300
  • 收稿日期:2001-04-29 修回日期:2001-07-27 发布日期:2001-11-15
  • 通讯作者: 李玉光 E-mail:ceslyg@zsu.edu.cn

Kinetics Modeling Study on Continuous Circulative Flow Immobilized Photocatalytic Reactor

Fan Shan-Hu;Yu Xiang-Yang;Zhan She-Xia;Chen Liu-Ping;Gu Xi-Lan;Li Yu-Guang;Shi Zhong-Bing   

  1. College of Chemistry and Chemical Engineering,Zhongshan University,State Key Laboratory of Ultrafast Laser Spectroscopy Zhongshan University,Guangzhou 510275;Research Institute of Environmental Protection Sciences of Guangzhou,Guangzhou 510300
  • Received:2001-04-29 Revised:2001-07-27 Published:2001-11-15
  • Contact: Li Yu-Guang E-mail:ceslyg@zsu.edu.cn

摘要: 以甲基橙为模型反应物,研究了连续循环固定床光催化反应器的动力学过程.根据光催化氧化过程特点,分析并建立了准一级反应动力学方程,对该反应系统的动力学过程进行动态数学模拟,用四阶Runge-Kutta法进行数值计算,结果表明数学模拟与实验数据相吻合.在该光催化反应体系中,处理量增加时实际反应速率常数k基本不变,而表观反应速率常数kapp变小,二者之间关系与反应器体积对处理量体积比(γ)密切相关;反应速率常数受起始浓度影响很大,在15~150 μmol•L-1浓度范围内,lnk=-0.48ln[c0]+1.42;反应速率常数与光强的关系为k∝I0.5;反应速率常数受溶液pH值的影响也很大.

关键词: 固定床, 光催化, 动力学, 数学模拟

Abstract: The kinetic process in a tubular continuous-flow photo-reactor equiped with titanium dioxide immobilized on glass fiber-net has been studied by using methyl orange as a model reactant.The process has been described carefully,and modeled by using dynamic partial differential equation.Since the solution of the equation was complicated,the numerical solution has been undertaken by using a fourth-order Runge-Kutta scheme.The results show that the mathematical simulated values are consistent with the experimental data.Under the condition of different treated reactant amount the actual reaction rate constant k is approximately identical,but the apparent reaction rate constant kapp decreases with increasing treatment of reactant amount.The initial concentration has a great influence upon the rate constant.Below 15 μmol•L-1 of the initial concentration the rate constant tends to be a constant.In the range of 15~150 μmol•L-1,the influence of the initial concentration on the reaction rate constant can be expressed as:lnk=-0.48lnc0+1.42.The dependence of reaction rate constant on UV irradiation intensity is k∝I 0.5.The pH of initial solution is an important factor in the photocatalysis reaction.

Key words: Immobilized bed, Photocatalysis, Kinetics, Mathematical simulation