摘要
为探讨O3/H2O2体系降解水中青霉素G(PCN)的效能及其降解机理,分别考察了在降解过程中pH、O3投加量和H2O2投加量对PCN和COD去除效果的影响,通过实验数据得出了PCN降解动力学方程;并采用傅里叶红外光谱和液相色谱-质谱联用分析探讨了PCN在O3氧化过程中的中间产物变化及其降解规律。结果表明:在初始ρ(PCN)为25 mg·L^−1、pH=10、O3投加量为1.48 g·L^−1、H2O2投加量为7.84 mmol·L^−1、温度为20℃的条件下,反应10 min后PCN可全部被降解,反应3 h后COD的去除率达到71.9%;O3的反应级数为0.6973,在降解过程中,O3初始浓度对反应速率的影响最大;反应活化能为Ea=27.59 kJ·mol^−1,该反应活化能较低,说明此反应容易发生;经氧化降解后,PCN的抑菌结构被破坏,并且产物中可能含有羧酸类和胺类化合物。以上研究结果对解决水体中PCN污染问题具有参考价值。
In order to investigate the efficiency and degradation mechanism of penicillin G(PCN)in water by O3/H2O2 system,the effects of pH,O3 and H2O2 doses on the removal of PCN and COD during the degradation process were analyzed.The kinetic equation of PCN degradation was obtained by fitting the experimental data.Infrared spectroscopy(FTIR)and liquid chromatography-mass spectrometry(LC-MS)were used to analyze the changes of the intermediates and the degradation rules during PCN ozonation.The results showed that PCN could be degraded completely after 10 minutes reaction,and COD removal rate could reach 71.9%after 3 hours reaction under the conditions of initialρ(PCN)of 25 mg·L^−1,pH 10,O3 dosage of 1.48 g·L^−1,H2O2 dosage of 7.84 mmol·L^−1 and 20℃.The O3 reaction order was 0.6973,and the initial concentration of O3 had the greatest influence on the reaction rate during the degradation process.The activation energy of the reaction was Ea=27.59 kJ·mol^−1,which was a relatively low value and indicated an easy-occurred reaction.After oxidative degradation,the bacteriostatic structure of PCN was destroyed,and the products may contain carboxylic acids and amine compounds.The research results provide reference for solving PCN pollution in water bodies.
作者
颜鸣扬
颜智勇
蔡意祥
彭博尚
李斐
YAN Mingyang;YAN Zhiyong;CAI Yixiang;PENG Boshang;LI Fei(College of Resources and Environment,Hunan Agricultural University,Changsha 410128,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2020年第9期2485-2493,共9页
Chinese Journal of Environmental Engineering
基金
国家水体污染控制与治理科技重大专项(2014ZX07206001)
湖南省自然科学基金资助项目(2016JJ5015)。
