超声-紫外光协同催化体系降解水中菲

Degradation of phenanthrene in water by US-UV synergetic catalytic system

以纳米TiO_2为催化剂,采用超声-紫外光协同催化体系降解水中菲,并考察了菲降解率的影响因素。实验结果表明:不同类型TiO_2对菲降解率的大小顺序为锐钛矿型TiO_2>P25型TiO_2>金红石型TiO_2;超声-紫外光协同催化体系对菲的降解率大于单独超声体系或紫外光催化体系,且均遵从一级反应动力学规律;在超声频率为60k Hz、声强为0.233 W/cm2、TiO_2投加量为0.06 g/L、pH为4.0、H_2O_2浓度为19.59 mmol/L的条件下降解75 min后,超声-紫外光协同催化体系对初始质量浓度为0.96 mg/L的菲的降解率可达76.78%。

Phenanthrene in water was degraded by ultrasonic wave （US）-ultraviolet light （UV） synergetic catalytic system with TiO2 nanoparticles as catalyst. The factors affecting phenanthrene degradation were investigated. The order of degradation rate on different kinds of TiO2 was as follows： anatase TiO2 〉 P25 TiO2 〉 rutile TiO2. The phenanthrene degradation rate on US-UV synergetic catalytic system was greater than that of single US or UV photocatalytic system, their degradation processes all followed the pseudo-first order kinetics. Under the conditions of ultrasonic frequency 60 kHz, sound intensity 0.233 W/cm2, TiO2 amount 0.06 g/L, pH 4.0, H202 concentration 19.59 mmol/L, initial phenanthrene mass concentration 0.96 mg/L and reaction time 75 min. the degradation rate ofnhenanthrene reached 76.78%.