Fe^(2+)活化过硫酸钾降解2,4,6-三氯苯酚的研究  

Study on Potassium Persulfate Activated by Fe^(2+) for Degradation of 2,4,6-Trichlorophenol

作　　者：刘姜裔 钟美娥[2] 高权[2] 

机构地区：[1]湖南农业大学东方科技学院,湖南长沙410128 [2]湖南农业大学理学院,湖南长沙410128

出　　处：《广州化工》2016年第13期73-75,共3页GuangZhou Chemical Industry

基　　金：湖南农业大学东方科技学院大学生研究性学习和创新实验计划项目(No.DFCXY201324);湖南省教育厅科学研究项目(15C0653)

摘　　要：以Fe^(2+)为活化剂,K_2S_2O_8为氧化剂,对水中2,4,6-三氯苯酚进行降解处理。首先研究K_2S_2O_8浓度和Fe SO4浓度等因素对2,4,6-三氯苯酚降解的影响,发现在K_2S_2O_8浓度为3.75 mmol/L和Fe SO4浓度为1.25 mmol/L,即K_2S_2O_8/Fe^(2+)=75∶25的条件下,2,4,6-三氯苯酚的降解率达到最大值,为91%。动力学研究表明,Fe^(2+)活化K_2S_2O_8降解2,4,6-三氯苯酚的过程可分为两个阶段,其中第一阶段反应速度较快,第二阶段为慢速反应,并且第二阶段符合一级反应动力学规律。To investigate the degradation of 2,4,6-trichlorophenol in water,the activating agent of Fe^（2＋） and the oxidant of K_2S_2O_8 were used.The effects of the concentrations of K_2S_2O_8 and Fe SO4 on the degradation of 2,4,6-trichlorophenol were studied.The optimal operating conditions were obtained as follows：3.75 mmol/L of K_2S_2O_8and1.25 mmol/L of Fe SO4,namely,the optimal molar ratio of oxidant K_2S_2O_8 to activating agent Fe^（2＋） was 75∶25.Under these conditions,the degradation rate of 2,4,6-trichlorophenol was 91%.The degradation kinetics of 2,4,6-trichloro-phenol showed that the reaction included an initial fast stage and a final slow stage.The reaction was very fast at the first stage,and became slow at the second stage which followed a first-order kinetic.

关 键 词：2 4 6-三氯苯酚 硫酸根自由基 过硫酸钾 Fe(2+) 

分 类 号：X703.1[环境科学与工程—环境工程]