水溶液中壬基酚聚氧乙烯醚的UV/H_2O_2矿化试验  

Experimental study on mineralizing nonylphenol ethoxylate in water solution by UV/H_2O_2 process

作　　者：魏健[1,2] 宋永会[1,2] 涂响[1] 赵乐[1,3] 郭昱廷[1] 徐东耀[3] 

机构地区：[1]中国环境科学研究院城市水环境科技创新基地,北京100012 [2]北京师范大学水科学研究院,北京100875 [3]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《安全与环境学报》2013年第3期42-46,共5页Journal of Safety and Environment

基　　金：国家科技重大专项课题(2012ZX07202-002);中法国际科技合作项目(2010DFB90590)

摘　　要：采用UV/H2O2催化氧化工艺进行水中壬基酚聚氧乙烯醚(NP-10)的降解和矿化试验,考察了H2O2投加量、溶液初始pH值、UV功率和反应温度对NP-10矿化效率的影响,并采用GC-MS对降解过程中间产物进行初步分析。结果表明:UV/H2O2体系能有效降解水溶液中的NP-10,在NP-10初始质量浓度为100.0mg/L、UV功率为45W、H2O2投加量为10.0mmol/L、溶液初始pH值为3.0、反应温度为25℃的条件下,20min时NP-10的去除率可达98.0%以上,240min时TOC去除率可达98.3%;NP-10的矿化过程符合拟一级动力学,矿化速率常数随光强和H2O2投加量的增加而增加,较低的pH值和较高的反应温度有助于NP-10的矿化;降解中间产物主要是酚类化合物;随着反应时间的增加,NP-10及其降解中间产物可以被完全矿化成CO2和H2O。This paper aims at introducing our experimental study on degrading and mineralizing the nonylphenol ethoxylate（NP-10） in water solution by UV/H2O2 process.For this study purpose,we have done experiments in a cylindrical photo-catalytic oxidation reactor with a temperature-controlling device.The paper has also made a discussion of the influence of H2O2 concentration,UV power,initial pH value and the reaction temperature on the mineralizing efficiency of NP-10 while analyzing the degradation intermediates of NP-10 by using GC-MS.The degrading process of NP-10 in the UV/H2O2 oxidation system includes the elementary chemical and photo-chemical reactions,which may have significantly synergetic effects on the H2O2 oxidation and UV photolysis.The results of our experiments indicate that it is possible to degrade NP-10 efficiently by processing UV/H2O2 oxidation,whose removing efficiency can be made to reach over 98.0% as a result of 20 min reaction.At the same time,the TOC removing efficiency can also be made to reach as high as 98.3% after 240 min reaction under the conditions with NP-10 being 100.0 mg/L at the reaction temperature of 25 ℃ and the H2O2 concentration being 10.0 mmol/L while keeping the UV power at 45 W and the initial pH value of 3.0.However,the mineralizing process of NP-10 proved to be coincided with the pseudo-first order reaction dynamic model.When the H2O2 ranged from 5.0 mmol/L to 10.0 mmol/L,the TOC removing efficiency tended to increase from 30.5% to 98.3%.The mineralizing rate constant of NP-10 would rise from 1.28×10-2 min-1 to 2.28×10-2 min-1 on the condition that the temperature increased from 20 °C to 40 ℃.Nevertheless,it tended to decrease to 1.73×10-2 min-1 when the temperature rose to 50 ℃.Therefore,lower pH value of the solution proves to be beneficial for NP-10 mineralization and the best mineralizing efficiency tended to appear with the pH value being 3.0.The GC-MS analysis we have done also shows that the main identified intermediates of NP-10 degradation were phenol co

关 键 词：环境工程学 壬基酚聚氧乙烯醚 UV H2O2 矿化 GC-MS 

分 类 号：TU991.2[建筑科学—市政工程]