超声协同光催化法降解水中土霉素

Degradation of Oxytetracycline (OTC) in Water by Ultrasound Coupled with Photocatalysis and Titanium Dioxide

目的利用超声协同光催化法降解水中的土霉素,探讨影响其对水中土霉素的降解效果因素。方法利用超声(US)、紫外光/二氧化钛(UA/TiO_2)以及超声/紫外光/二氧化钛(US/UA/TiO_2)三种方法对土霉素样品进行处理,采用高效液相色谱仪对处理后的样品进行检测。结果利用超声协同光催化法降解水中的土霉素,其最佳的条件为:光照时间75 min,超声功率200 W,超声时间30 min,催化剂浓度10 mg/L,pH=10.8,硝酸根浓度2 mg/L。结论利用超声协同光催化降解水中的土霉素具有技术简单、环保、高效省时的优点,可以将其应用至系统化的土霉素污水的处理。

Objective To investigate the effect of ultrasound coupled with photocatalysis and titanium dioxide( TiO_2) on the degradation of oxytetracycline( OTC) in water. Method Ultrasound( US),UV/TiO_2 and US/UV/TiO_2 three methods were used to degrade oxytetracycline in water samples,and the processed sample was detected by HPLC. Results Oxytetracycline in water was degraded in combining ultrasound and photocatalysis reaction; the optimal condition for degradation was illuminating for 75 min,using an ultrasonic power of 200 W for30 min; in an initial OTC concentration of 0. 5 mg/L,an initial catalyst concentration of 10 mg/L,pH = 10. 8 and a nitrate concentration of 2 mg/L. Conclusions The advantage of using the combination of ultrasound and photocatalytic reaction system to degrade the oxytetracycline in water was simple,environment-friendly,efficient and time-saving. This method could be used systematically in the degradation of oxytetracycline in wastewater.