摘要
文章采用共沉淀法合成了镁铁纳米层状双氢氧化物(Mg/Fe-LDH),对其吸附敌敌畏并通过添加H_2O_2降解进行了研究。通过温度、pH、时间和农药浓度等单因素以及交互试验,得到Mg/Fe-LDH吸附敌敌畏最佳条件为:敌敌畏浓度80μg/mL,反应温度70℃,反应时间75 min,该条件下对敌敌畏的吸附率为88.16%。通过XRD和FTIR对吸附敌敌畏前后的Mg/Fe-LDH样品进行表征分析,验证了敌敌畏的吸附,层间距增大表明敌敌畏进入了Mg/Fe-LDH的片层间。在敌敌畏浓度低于约280μg/mL时,吸附动力学曲线更符合Freundlich模型;当敌敌畏浓度高于约280μg/mL时,吸附动力学曲线更符合Langmiur模型。在室温条件下,250 mmol/L H_2O_2反应30min,或50 mmol/L H_2O_2反应2 h,敌敌畏的降解接近100%。通过GC-MS分析了降解产物,检测到的产物主要有二氯乙酸、二氯乙醛、二氯甲烷等。
Nano Mg/Fe layered double hydroxide (Mg/Fe-LDH)was synthesized by co-precipitation.The optimum condi tions for the adsorption of dichlorvos (DDVP)by nanoLDH were investigated by single factor and orthogonal experiment for temperature,pH,adsorptive time and the concentration of DDVP.The optimum conditions were the concentration of DDVP 80 μg/mL,temperature 70℃,adsorptive time 75 min,and 88.16% of DDVP could be absorbed.XRD and were used to investigate the characterized adsorption,and the results confirmed the adsorption.DDVP may intercalate the interlayer of Mg/Fe-LDH.The isotherm suggested that adsorption met the Langmuir equation.The DDVP could be de graded thoroughly in room temperature when added 250 mmol/L H2O2 for 30 min or 50 mmol/L H2O2 for 2 h.The degra dation products were analyzed by GC-MS.The main outcome detected were dichloroacetic acid,dichloroacetaldehyde,di chloromethane.
作者
刘乐
丁一
冯艳丽
房耀维
安红
吕明生
王淑军
LIU Le;DING Yi;FENG Yanli;FANG Yaowei;AN Hong;LYU Mingsheng;WANG Shujun(College of Marine Life and Fisheries,Huaihai Institute of Technology,Lianyungang 222005,China;School of Chemical Engineering,Huaihai Institute of Technology,Lianyungang 222005,China;Marine Resources Development Institute of Jiangsu,Lianyungang 222005,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2018年第11期93-99,共7页
Environmental Science & Technology
基金
江苏省科技厅社会发展项目(BF2016702)
连云港市521工程项目
