甲醛气相光催化降解特性探究

Research into Photocatalytic Degradation of Formaldehyde Gas Phase

探讨了可见光照射下,甲醛气体的光催化降解行为。结果表明,催化剂用量增加,甲醛气相光催化降解速率增加,当催化剂达到一定量后,甲醛气相光催化降解速率不再增加;甲醛气体初始浓度增加,光催化反应速率亦增加,但过高的初始浓度会使光催化反应速率或甲醛降解率降低;甲醛气相光催化反应过程中氧气O2和水H2O对于反应的进行都是必不可少的,但过多的水分却对光催化反应有抑制作用;甲醛气相光催化反应符合Langmuir-Hinshelwood(L-H)动力学模型。

Under the visible light irradiation,the behavior about photocatalytic degradation of formaldehyde gas was explored.The results show that the formaldehyde gas phase photocatalytic degradation rate increases with increasing the amount of catalyst initially,yet the rate is no longerin-creased while the amount of catalyst reaches up to a certain dosage;As to the effect of initial concen-tration of formaldehyde gas on photocatalytic reaction rate presents similar phenomenon as the cata-lyst dosage effect,but exc...