酸性条件下Ti(Ⅳ)催化O_3/H_2O_2降解邻苯二甲酸二甲酯  

Degradation of Dimethyl Phthalate by Ti(Ⅳ)-catalyzed O_3/H_2O_2 Under Acidic Conditions

作　　者：高燕[1] 沈佟栋 陈尧[1] 周慧华 童少平[1] 

机构地区：[1]浙江工业大学化学工程与材料学院,绿色化学合成技术国家重点实验室培育基地,杭州310032 [2]浙江省工业环保设计研究院有限公司,杭州310005

出　　处：《环境科学》2014年第8期2980-2984,共5页Environmental Science

基　　金：国家自然科学基金项目(21176225);浙江省重大科技专项(2013C03019)

摘　　要：研究了酸性条件下O3、O3/H2O2、Ti(Ⅳ)/O3和Ti(Ⅳ)/O3/H2O2氧化邻苯二甲酸二甲酯(DMP)的效能.结果表明,在初始pH为2.8条件下,Ti(Ⅳ)/O3/H2O2体系对DMP的降解效率,矿化程度和臭氧的利用率都明显优于其他3种氧化体系.相同条件下O3、O3/H2O2、Ti(Ⅳ)/O3和Ti(Ⅳ)/O3/H2O2降解DMP的一级表观速率常数分别为3.96×10-4s-1、9.54×10-4s-1、1.07×10-3s-1和6.41×10-3s-1.与单独臭氧化相比,Ti(Ⅳ)/O3/H2O2体系臭氧的利用率约可提升6.51%.优化实验表明,本实验条件下Ti(Ⅳ)的最佳浓度为1.4 mg·L-1,H2O2最佳投加量为10 mg·L-1.结合气质联用(GC/MS)与离子色谱(IC)的分析结果,对Ti(Ⅳ)/O3/H2O2降解DMP的可能反应途径进行了初步的解析.The degradation efficiencies of dimethyl phthalate（DMP） by O3,O3/H2O2,Ti（Ⅳ）/O3 and Ti（Ⅳ）/O3/H2O2 were investigated under acidic conditions. The results indicated that Ti（Ⅳ）/O3/H2O2 was the best system with the highest degradation efficiency and mineralization rate of DMP,and the highest utilization rate of ozone at pH 2. 8. The apparent rate constants of DMP degradation by O3,O3/H2O2,Ti（Ⅳ）/O3 and Ti（Ⅳ）/O3/H2O2 under the same conditions were 3. 96 × 10- 4s^- 1,9.54 ×10- 4s^- 1,1. 07 × 10^-3s^- 1and 6. 41 × 10^-3s^- 1,respectively. The ozone utilization rate of Ti（Ⅳ）/O3/H2O2 was improved by 6. 51% compared with that of ozonation alone. The experimental results showed that the optimized concentrations of Ti（Ⅳ） and H2O2 were 1. 4 mg·L^-1and 10 mg·L^-1,respectively. According to the results of gas chromatography-mass spectrometry（GC/MS） and ion chromatography analysis,the possible reaction pathway of DMP degradation by Ti（Ⅳ）/O3/H2O2 was proposed and discussed.

关 键 词：臭氧 过氧化氢 钛离子 邻苯二甲酸二甲酯 中间产物 降解 

分 类 号：X131.2[环境科学与工程—环境科学]