TiO_2固定床光催化氧化头孢拉啶  

Photocatalytic Degradation of Cefradine in Water over Immobilized TiO_2 Catalyst in Continuous-Flow Reactor

作　　者：范山湖[1] 沈勇[1] 陈六平[1] 古喜兰[1] 李玉光[1] 石宗炳 

机构地区：[1]中山大学化学化工学院,广东广州510275 [2]广州环境保护科学研究所,广东广州510300

出　　处：《催化学报》2002年第2期109-112,共4页

基　　金：广州市环境保护局资助研究课题

摘　　要：研究了抗生素头孢拉啶在负载型TiO2 连续循环流动反应器中的降解 ,用红外和紫外光谱跟踪头孢拉啶的光催化降解过程 .结果显示 ,在反应液流速 4 5L/min ,氧气流速 1 6L/min ,光照强度 30W ,反应温度 2 8± 2℃和反应时间 12 0min的光催化氧化条件下 ,头孢拉啶能完全降解 .光降解过程中头孢拉啶羧基的氧化比胺基容易 .添加H2 O2 可以提高光催化氧化反应速率 .光催化降解动力学研究表明 ,头孢拉啶的光催化氧化符合LangmuirThe photocatalytic degradation of cefradine in water was studied in a tubular continuous-flow photoreactor equipped with the titanium dioxide catalyst immobilized on a glass fiber net. Infrared spectroscopy and ultroviolet spectrophotometry were used to determine the transformation of species during the degradation of cefradine, The results indicated that cefradine can be completely degraded by the photocatalytic oxidation under the conditions of reactant flow rate 4.5 L/min, oxygen flow rate 1.6 L/min, light strength 30 W, reaction temperature 28+/-2 degreesC, and reaction time 120 min. The carboxyl group of cefradine is decomposed more easily than the amino group. The rate of degradation of cefradine can be described by the Langmuir-Hinshelwood equation. However, the rate constant is obviously affected by the initial concentration of cefradine. The dependence can be described as k proportional to c(0) (-1.60). The results also showed that the addition of hydrogen peroxide improves the photocatalytic efficiency significantly.

关 键 词：二氧化钛 光催化 抗生素 头孢拉啶 氧化降解 动力学 制药工业 废水处理 固定床 

分 类 号：O643.3[理学—物理化学]