环境工程学报2017，Vol.11Issue(11)：5810-5819,10.DOI:10.12030/j.cjee.201704031
UV/H2O2降解水中磺胺嘧啶影响因素及机理
Influencing factors and mechanism of sulfadiazine degradation by UV/H2O2
摘要
Abstract
The UV/H2O2 photo-oxidation reactor was applied to degrade sulfadiazine solution.The effect of H2O2 concentration,initial pH value,UV light power and sulfadiazine concentration on removal efficiency were investigated.The reaction kinetics and degradation products were also analyzed to full understand the degradation process.The results showed that the UV/H2O2 process was effective for the degradation of sulfadiazine with a removal efficiency above 90％,and the degradation process fitted well with the first-order kinetics model (R2 =0.991 2).There had a satisfied linear relation between the degradation rate and H2O2 dosage.The degradation rate increased from 0.048 2 to 0.359 9 min-1 when the H2O2 dosage increased from 0.03 to 1.50 mmol · L-1 The degradation rate also increased from 0.066 2 to 0.163 1 min-1 with an increase of UV light power from 5 to 15 W.In contrast,the degradation rate decreased from 0.251 7 to 0.046 8 min-1 with an increase of sulfadiazine concentration from 0.02 to 0.08 mmol · L-1.The pH value also can affect the degradation rate,which increased from 0.070 2 to 0.102 3 min-1 when pH value increased from 3.0 to 7.0.However,the degradation rate decreased to 0.050 2 min-1 when pH value increased to 11.0.The results of liquid chromatography-mass spectrometry (LC/MS) suggested that three intermediate degradation-products were formed with a mass-to-charge ratio (m/z) of 173,186 and 200,respectively.It was indicated that S-N bonds and N-N bonds were broken in the process,and the intermediate products can further degraded.However,the results showed that only 7％ of TOC was removed,indicating that only small part of sulfadiazine were mineralized.Finally,the electrical energy per order (EEo) was used to evaluate the cost of sulfadiazine degradation process in UV/H2O2 photo-oxidation reactor.The results showed that the EEO was only 0.078 kWh · m-3 at the optimum conditions,which can provide a reference for practical engineering application.关键词
磺胺嘧啶/UV/H2O2/降解速率常数/降解产物Key words
sulfadiazine/UV/H2O2/degradation rate constant/degradation product分类
资源环境引用本文复制引用
苟玺莹,张盼月,钱锋,王培良,赵春晓,宋永会..UV/H2O2降解水中磺胺嘧啶影响因素及机理[J].环境工程学报,2017,11(11):5810-5819,10.基金项目
国家水体污染控制与治理科技重大专项(2012ZX07202-005) （2012ZX07202-005）
