循环流动固定床光催化反应器动力学数学模拟  

Kinetics Modeling Study on Continuo us Circulative Flow Immobilized Photocatalytic Reactor

作　　者：范山湖[1] 余向阳[1] 湛社霞[1] 陈六平[1] 古喜兰[1] 李玉光[1] 石宗炳 

机构地区：[1]中山大学化学与化学工程学院 [2]广州环境保护科学研究所,广州510300

出　　处：《物理化学学报》2001年第11期1000-1005,共6页Acta Physico-Chimica Sinica

基　　金：广州市环境保护局资助研究课题~~

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15～150μmol·L-1浓度范围内lnk=-0.48lnc0+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.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 k.,, decreases with increasing treatment of reactant amount. The initial concentration has a great influence upon the rate constant. Below 15 mu mol (.) L of the initial concentration the rate constant tends to be a constant. In the range of 15 similar to 150 mu mol . L-1, the influence of the initial concentration on the reaction rate,constant can be expressed as: In k 0.48ln c(o) + 1. 42. The dependence of reaction rate constant on UV irradiation intensity is k proportional to I-0.5. The pH of initial solution is an important factor in the photocatalysis reaction.

关 键 词：固定床 光催化 动力学 数学模拟 光催化反应器 氧化 速率常数 

分 类 号：O643.3[理学—物理化学]