UV光强度对甲基橙光催化降解性能影响的研究

Effect of UV Intensity on Methyl Orange Photocatalytic Degradation

以自制的纳米TiO2为光催化剂,甲基橙(MO)为模型污染物,在自行设计的浅池光催化反应器上进行了甲基橙光催化降解反应研究,主要研究了紫外光强度(I)对MO光催化降解速率及降解反应的表观光量子产率(Φapp)的影响。实验结果表明,紫外光强度(I)对甲基橙光催化降解反应的速率常数(k)影响较大;通过对实验数据进行拟合,得到紫外光强度(I)与反应速率常数(k)之间的关联式;此外,在对多相光催化反应体系的光量子产率(Φapp)进行定义的基础上,通过对光催化反应体系提出几点合理假设,建立了一个可用于估算光催化反应体系光量子产率的简化数学模型。

Methyl orange （MO） photocatalytic degradation reaction were carried out in a self-designed fixed bed shallow photoreactor using self-made nano-TiO2 as a photocatalyst and methyl orange （MO） as a model organic contamination. The effect of UV intensity （I） on MO photocatalytic degradation rate and its apparent quantum yield （ Φapp） were investigated in this system. The experimental results showed that the UV intensity （I） affected the photocatalytic degradation reaction rate constant （k） greatly, and a relationship equation between k and I was obtained. Further, based on the definition of Φapp for heterogeneous photocatalysis system and several reasonable simplification and assumptions, a simplified mathematic model expression was deduced to evaluate the quantum yield of photocatalytic system.