超声协同二氧化钛光催化法降解水中磺胺甲噁唑和红霉素最佳工艺条件的研究

Screening of optimum conditions for degradation of sulfamethoxazole and erythromycin in water using ultrasound and titanium dioxide photocatalysis

目的观察超声协同二氧化钛(TiO2)光催化法降解水中磺胺甲噁唑(SMZ)和红霉素(EM)效果。方法分别用超声和(或)紫外光/TiO2处理SMZ和EM水溶液,再用高效液相色谱法检测水中SMZ和EM含量。结果水样pH为7、硝酸根质量浓度为2.0mg/L、腐殖酸质量浓度为8mg/L、催化剂TiO2质量浓度为10mg/L、超声功率为450W、光照15min及超声50min时降解SMZ效果最佳;水样pH值为1、硝酸根质量浓度为2.0mg/L、腐殖酸质量浓度为6mg/L、催化剂TiO2的质量浓度为1mg/L、超声功率为400W、光照75min及超声20min时降解EM效果最佳。结论超声协同TiO2光催化法可有效降解水中SMZ和EM。

Objective To observe the effect of ultrasound and titanium dioxide (TiO2) photocatalysis on degradation of sulfamethoxazole (SMZ) and erythromycin (EM) in water. Methods SMZ and EM aqueous solution was treated with ultrasound and/or ultraviolet-titanium dioxide (TiO2). Residual SMZ and EM were detected by high-performance liquid chromatography. Results The optimum degradation conditions were water pH=7, 2.0 mg/L nitrate, 8 mg/L humic acid, 10 mg/L TiO2, 450 W ultrasound with 50 min irradiation, and 15 min ultraviolet radiation for SMZ;and water pH=1, 2.0 mg/L nitrate, 6 mg/L humic acid, 1 mg/L TiO2, 400 W ultrasound with 20 min irradiation, and 75 min ultraviolet radiation for EM. Conclusion Combined ultrasound and TiO2 photocatalysis is effective for degradation SMZ and ER in water.