臭氧氧化降解水中头孢氨苄的效能与机理研究  

Degradation efficiency and mechanism of ozone on cephalexin in water

作　　者：陶辉[1] 李文君[1] 陈卫[1] 陈连生[1] 冯博[1] 王伦[1] 徐峰[1] 

机构地区：[1]河海大学浅水湖泊综合治理与资源开发教育部重点实验室环境学院,南京210098

出　　处：《给水排水》2014年第11期115-119,共5页Water & Wastewater Engineering

基　　金：苏州市科技支撑计划(SS201303)

摘　　要：研究了臭氧对难降解的头孢氨苄(CLX)的氧化效果,考察臭氧投加量、pH、腐殖酸、自由基抑制剂对反应的影响。结果表明,当反应的化学计量比达到1.1([O3]=1.5 mg/L,[CLX]=10mg/L)时,反应10min,CLX的降解率达到96.67%。碱性条件下,OH-离子的增加促进了臭氧分解产生OH,有利于臭氧氧化水中CLX,当CLX初始浓度为10mg/L,臭氧投加量为1.0mg/L,水样pH为2.5时,CLX的降解率仅为26.11%;水样pH增到10.0时,CLX的降解率增到91.26%。腐殖酸对臭氧氧化CLX的影响与腐殖酸的浓度有关,低浓度(2.5mg/L)时对臭氧氧化CLX效果有所促进,其降解率提高了4.73%;高浓度时,抑制臭氧氧化反应,且随着腐殖酸浓度的提高,CLX降解效果逐渐降低,当腐殖酸浓度达到20mg/L时,CLX的降解率仅有28.55%。·OH抑制剂叔丁醇对臭氧氧化去除CLX具有明显的抑制作用,当叔丁醇浓度大于50mg/L后,CLX的降解率仅约为12%。This paper studied the oxidation of ozone on cephalexin （CLX）. The influences of ozone dosage, pH, humic acid, and hydroxyl free radical on the degradation of cephalexin by ozone were investigated in detail. Results showed that when the stoichiometrie ratio of the reaction was 1. 1（[O3] = 1.5 mg/ L, [CLX]=10 mg/L）, the degradation rate of CLX could reach 96. 67% in 10 minutes. In the alkaline conditions, the increase of OH- promoted the process that ozone oxidation would produce ·OH, which would enhance the degradation of CLX by ozone in water. When the initial concentration of the CLX was 10 mg/L, the dose of the ozone was 1.0 mg/L, and the pH in water was 2. 5, the CLX degradation rate was only 26. 11%; while, when the pH in water increased to 10. 0, the CLX degradation rate would increase to 91. 26%. The influence of humic acid on ozone oxidation of CLX was associated with the concentration of humic acid. The low concentration of humie acid （2.5 mg/L） would promote the effect of the ozone oxidation of CLX and its degradation rate increased by 4. 73 %. The high concentration of humic acid would inhibit the ozone oxidation and the CLX degradation effect gradually reduced with the increase of concentration of humic acid, when the concentration of humic acid reached 20 rng/L, the degradation rate of CLX was only 28. 55%. The hydroxyl free radical inhibitor-tert-butyl alcohol had obvious inhibitory effect on ozone oxidation of CLX. When the concentration of tert-butyl alcohol was more than 50 mg/L, the degradation of CLX rate was only about 12%.

关 键 词：头孢氨苄 臭氧 羟基自由基 降解 

分 类 号：X703[环境科学与工程—环境工程]