摘要
以间甲酚(MC)为对象,研究了Fe(Ⅵ)/H_(2)O_(2)体系对其的降解效果及机理。考察了Fe(Ⅵ)投加量、H_(2)O_(2)浓度、pH和温度等因素对间甲酚降解率的影响;利用HPLC、GC-MS等方法对其进行分析与表征,解析Fe(Ⅵ)/H_(2)O_(2)体系降解MC过程中的产物并推测可能的降解路径。结果表明,当Fe(Ⅵ)和间甲酚物质的量比为5∶1、H_(2)O_(2)浓度为40 mmol/L、pH为4、温度为25℃时,反应16.5 min后间甲酚的降解率可达到100%,最终矿化度为23.85%。Fe(Ⅵ)氧化MC阶段,起氧化作用的主要为中间高价态铁;后期类Fenton氧化阶段,·OH起主要作用,反应符合准一级动力学模型,反应速率常数为0.35832。
The degradation effect and mechanism of m-cresol by Fe(Ⅵ)/H_(2)O_(2) system is studied,and the effects of Fe(Ⅵ)dosage,H_(2)O_(2) dosage,pH and temperature on the degradation rate of m-cresol are investigated.HPLC,GC-MS and other methods is employed to characterize the products generated in the degradation process of m-cresol by Fe(Ⅵ)/H_(2)O_(2) system,and speculate the possible degradation pathways.The results show that the degradation rate of m-cresol reaches 100%and the final mineralization rate is 23.85%when the molar ratio of Fe(Ⅵ)to m-cresol is 5∶1,the reaction has performed for 16.5 min,the dosage of H_(2)O_(2) is 40 mmol·L^(-1),pH is 4,and the temperature is 25℃.The intermediate high valence iron plays a major role in the oxidation of m-cresol by Fe(Ⅵ),while·OH has primary effect in subsequent Fenton-like oxidation process,which conforms to the quasi-first-order kinetic model with a reaction rate constant of 0.35832.
作者
冯卓
李亚男
张静
张国凯
王嘉琪
FENG Zhuo;LI Ya-nan;ZHANG Jing;ZHANG Guo-kai;WANG Jia-qi(College of Environmental Science and Engineering,Taiyuan University of Technology,Jinzhong 030600,China;Hebei Construction&Investment Group Water Investment Co.,Ltd.,Shijiazhuang 050000,China;Chinasea Group Environmental Protection Engineering Co.,Ltd.,Taiyuan 030012,China)
出处
《现代化工》
CAS
CSCD
北大核心
2022年第11期194-200,共7页
Modern Chemical Industry
基金
山西省基础研究计划项目(20210302123121)。
