Fe(Ⅲ)-草酸盐/H_2O_2体系对环丙沙星的紫外光降解  

Photodegradation of Ciprofloxacin in Fe(Ⅲ)-Oxalate/H_2O_2 System

作　　者：孙杰[1] 张晗[1] 曾沛[1] 王浪[1] 

机构地区：[1]中南民族大学环境工程研究所,湖北武汉430074

出　　处：《环境科学与技术》2016年第5期17-21,122,共6页Environmental Science & Technology

基　　金：国家自然科学基金项目(21007018)

摘　　要：采用Fe（Ⅲ）/草酸钠/H2O2/UV体系对水中环丙沙星进行降解,探讨了Fe（Ⅲ）、草酸钠和H2O2的初始浓度及溶液pH对环丙沙星降解的影响,对环丙沙星的降解产物进行紫外光谱、傅里叶红外和GC-MS的分析,简单探讨了体系对环丙沙星降解的机理,并对反应过程进行了动力学分析。结果表明体系对环丙沙星具有良好的降解效果,反应过程中环丙沙星的分子结构被破坏,随着反应的进行,环丙沙星逐渐被降解成小分子物质。UV是体系降解环丙沙星的必要条件。在pH为2.0~6.0的范围内,体系对环丙沙星均具有降解效果,且溶液的pH值越小,降解效果越好。溶液中Fe（Ⅲ）、草酸钠和H2O2初始浓度的增加均对环丙沙星的降解有促进作用。动力学分析结果表明,体系对环丙沙星的降解符合拟一级动力学规律,且Fe（Ⅲ）是影响体系反应速率的主要因素。Various experimental parameters were investigated to study the photodegradation of ciprofloxacin in Fe（ Ⅲ）/oxalate/H2O2 system. The main factors influencing the process, such as Fe（Ⅲ）- oxalate complexes, pH and H2O2 concentration were examined. Kinetics of degradation processing was also discussed in the experiment. The degradation products of ciprofloxacin were analyzed by UV-VIS, FTIR and GC-MS. The results showed that the degradation of ciprofloxacin was of high-efficient in Fe（Ⅲ） /oxalate/ H2O2 system, and the UV-irradiation was required. Molecular structure of ciprofloxacin will be destroyed during the degradation. Ciprofloxacin was more inclined to be photocatalytically degraded at lower pH conditions. Furthermore, reaction rates of ciprofloxacin increased along with the increase of initial concentrations of Fe（ Ⅲ）,oxalate and H2O2. Dynamics analyses demonstrated that the degradation of ciprofloxacin was obeyed with the pseudo-first-order kinetics, with Fe（Ⅲ） as the predominant influence factor during the treatment.

关 键 词：环丙沙星 Fe(Ⅲ) 草酸钠 紫外光 H2O2 

分 类 号：X131.2[环境科学与工程—环境科学]