改性TiO_2光催化降解水体中菲的研究

Study on Photocatalytic Degradation of Phenanthrene in Water over Modified TiO_2

采用水热法制备粉末状N-Cd共掺杂TiO2催化剂,研究了催化剂对水体中菲的光催化降解反应,讨论了菲初始浓度、催化剂的投加量、H2O2的浓度、异丙醇以及呋喃甲醇对菲光降解反应的影响。结果表明:菲的光催化降解符合一级反应动力学,水体中菲初始浓度越高,其光降解率越低;催化剂和H2O2在一定范围内随投入量的增加,菲的光催化降解速率也增加,但当投入量较多时又降低了降解速率;异丙醇以及呋喃甲醇的加入可以推断出菲的光催化降解过程.OH是的主要活性物种,而1O2的作用较小。

The catalyst（N,Cd-codoped TiO2 powder） was synthesized by the hydrothermal method.The photocatalytic degradation of phenanthrene over N,Cd-codoped TiO2 in aqueous solution was investigated.The influence of initial polycyclic aromatic hydrocarbons（PAHs） concentration,the dosage of N,Cd-TiO2,the volume of H2O2 solution,presence of isopropanol（i-PrOH） and furfuryl alcohol（FFA） on the degradation rate was observed.The results showed that the photocatalytic degradation of phenanthrene can be expressed by first-order kinetics model.The higher of the initial concentration of phenanthrene in the aquatic solution,the lower the photocatalytic rate was.With the increase of catalyst and H2O2 solution,the degradation rate of phenanthrene increased,but it can prevent from degrading at a high dosage.1O2 played a negligible role on the photodegradations of PHE,while hydroxyl radicals（HO·） were the main active species for its photocatalytic degradation when isopropanol（i-PrOH） and furfuryl alcohol（FFA） were applied.