作　　者： ; ; ; ;

机构地区： 暨南大学生命科学技术学院化学系

出　　处： 《生态科学》 2008年第6期446-451,共6页

摘　　要： 以二氧化钛(TiO2)为光催化剂,分别采用高压汞灯和反射镝灯为紫外光和模拟日光光源,对头孢曲松钠进行光催化降解,用紫外光谱跟踪其光催化降解过程。考察了光催化体系中光源、催化剂用量、光照时间、电子受体以及其他离子的存在对光催化降解过程的影响。结果显示,当反应物初始浓度500mg·L-1,在高压汞灯和反射镝灯条件下反应5小时后,在催化剂用量分别为2.5g·L-1和2.0g·L-1时对头孢曲松钠的降解效果最好,分别达到93.4%和73.8%。体系中加入电子受体能促进光催化反应速率,而一些无机离子如HCO3-、SO42-、Cl-等的存在显著降低了TiO2光催化剂的活性。实验结果有助于抗生素制药工业废水的光催化处理研究。 Titanium dioxide （TiO2） was applied as photocatalyst to treat the ceftriaxone sodium solution with high pressure mercury lamp and fluorescent dysprosin lamp as ultraviolet and simulated sunlight source respectively. Ultraviolet spectroscopy was used to determine the concentration of reactant during the degredation of ceftriaxone sodium. The effects of light source, photocatalyst dosage, irradiation time, the existence of electron acceptors and other ions on ceftriaxone sodium degradation were investigated in details. The results indicated that after 5 hours, the degradation ratio of ceftriaxone sddium reached to 93.4% and 73.8% by photocatalytic oxidation with UV and simulated sunlight irradiation under the conditions of initial ceftriaxone sodium concentration 500 mg·L^-1 and TiO2 concentration 2.5 g·L^-1 and 2.0 g·L^-1 separately. The results also showed that the addition of electron acceptors could enhance the photocatalytic efficiency significantly while the presence of some inorganic ions like HCO3^-, SO4^2-, Cl^- might lead to the decrease of the photocatalytic efficiency remarkably.

关 键 词： 头孢曲松钠 抗生素 二氧化钛 光催化降解

领　　域： [环境科学与工程]