LED-紫外线/氯高级氧化降解苯妥英钠特性  

DEGRADATION CHARATERISTICS OF PHENYTOIN SODIUM BY LED-UV/CHLORINE ADVANCED OXIDATION PROCESS

作　　者：李智明 吴乾元 王文龙[1,2] LI Zhi-ming;WU Qian-yuan;WANG Wen-long(Environmental Simulation and Pollution Control State Key Joint Laboratory,School of Environment,Tsinghua University,Beijing 100084,China;Environmental Microbial Application and Risk Control Key Laboratory, Graduate School at Shenzhen,Tsinghua University,Shenzhen 518055,China)

机构地区：[1]清华大学环境学院环境模拟与污染控制国家联合重点实验室,北京100084 [2]清华大学深圳研究生院深圳市环境微生物利用与安全控制重点实验室,广东深圳518055

出　　处：《环境工程》2019年第6期78-82,89,共6页Environmental Engineering

基　　金：国家重点研发计划资助(2016YFE0118800)

摘　　要：发光二极管(light emitting diode,LED)作为新型紫外线光源,其与活性氯联用的LED-紫外线/氯高级氧化技术可协同高效降解抗惊厥药微量污染物苯妥英钠(phenytoin sodium,PHT)。LED-紫外线剂量为0. 82 J/cm2时,LED-紫外线/氯高级氧化对水中的PHT去除率到62%,远高于单独氯化和单独LED-紫外线处理的加和。降解动力学研究发现:LED-紫外线/氯高级氧化降解PHT符合准一级反应动力学。280 nm LED作为光源的LED-紫外线/氯相比310 nm LED-紫外线/氯有更好的PHT去除效果。与LED-紫外线/H2O2和LED-紫外线/过硫酸盐相比,氧化剂(氯、H2O2和过硫酸盐)浓度为0. 282 mmol/L时,LED-紫外线/氯高级氧化降解PHT的准一级反应动力学常数(0. 096 min-1)远高于LED-紫外线/H2O2和LED-紫外线/过硫酸盐,分别是其3. 7倍和3. 0倍。优化氯投加量发现,LED-紫外线/氯高级氧化在较低氯投加量(10 mg/L)条件下即可高效降解PHT。对PHT毒性变化研究发现,氯化作用降解PHT过程中,可生成具有急性毒性的中间产物,且持续累积。LED-紫外线/氯高级氧化降解PHT在较低紫外线剂量(0. 08 J/cm2)下生成了具有急性毒性的中间产物,随着紫外线剂量增加至0. 41 J/cm2,毒性中间产物被有效去除。LED-UV/chlorine advanced oxidation process combining light emitting diode (LED), as a new type of ultraviolet light source with active chlorine, was found to be able to efficiently degradate anticonvulsant drug micro pollutant phenytoin sodium (PHT). LED-UV/chlorine advanced oxidation process could remove 62% of PHT under the LED-UV dosage of 0.82 J/ cm^2, which was far higher than the sum of single chlorination and single LED-UV radiation. It’s discovered in the study of degradation kinetics that the degradation of PHT by LED-UV/chlorine advanced oxidation process conformed to pseudo-first-order reaction kinetics. 280 nm LED-UV/chlorine had a better PHT removal effect than 310 nm LED-UV/chlorine. Compared to LED-UV/H 2O 2 and LED-UV/persulfate, with same oxidant dosage of 0.282 mmol/L, the pseudo-first-order reaction kinetics constant (0.096 min -1 )of LED-UV/chlorine advanced oxydative degradation of PHT was 3.7 and 3.0 times higher than that of LED-UV/H 2O 2 and LED-UV/persulfate respectively. It’s discovered from the optimization of chlorine dosage that, LED-UV/chlorine advanced oxidation could significantly degradate PHT with a lower chlorine dosage of 10 mg/L. It’s discovered in the study on toxicity change of PHT that, in the degradation of PHT with chlorination, intermediate products with acute toxicity were generated and continued to accumulate. In the degradation of PHT by LED-UV/chlorine, the intermediate products with acute toxicity were generated under a lower ultraviolet dosage of 0.08 J/cm^2, and with the increase of ultraviolet dosage to 0.41 J/cm^2, toxic intermediate products could be efficiently removed.

关 键 词：LED-紫外线/氯 苯妥英钠 氯投加量 急性毒性 

分 类 号：X703[环境科学与工程—环境工程]