摘要
采用聚乙烯亚胺(PEI)改性氨基化锆基金属有机骨架材料(UiO-66-NH2)制备了UiO-66-NH2/PEI,利用XRD、SEM和FTIR对产物进行了表征,并将其用于吸附水中的U(Ⅵ)。考察了UiO-66-NH2/PEI吸附U(Ⅵ)的影响因素,并研究了吸附动力学和等温线。实验结果表明:UiO-66-NH2/PEI对U(Ⅵ)具有良好的吸附效果,PEI与UiO-66-NH2质量比为30%、溶液pH为6、吸附剂投加量为80 mg/L、吸附时间为120 min、初始U(Ⅵ)质量浓度为10 mg/L时,UiO-66-NH2/PEI对U(Ⅵ)的去除率达98.2%(303 K下);UiO-66-NH2/30%PEI对U(Ⅵ)的吸附在60 min内达到平衡,吸附过程符合准二级动力学模型和Langmuir模型,最大吸附量达452.49 mg/g。
Aminated zirconium-based metal organic framework material(UiO-66-NH2)was modified with polyethylenimine(PEI)to prepare UiO-66-NH2/PEI.The products were characterized by XRD,SEM and FTIR,and used to adsorb U(Ⅵ)from water.The factors affecting U(Ⅵ)adsorption were analyzed,and the adsorption kinetics and isotherm were investigated.The experimental results show that:UiO-66-NH2/PEI have good adsorption effect on U(Ⅵ),when the mass ratio of PEI to UiO-66-NH2 is 30%,the solution pH is 6,the adsorbent dosage is 80 mg/L,the adsorption time is 120 min and the initial U(Ⅵ)mass concentration is 10 mg/L,the removal rate of U(Ⅵ)on UiO-66-NH2/PEI is 98.2%(under 303 K);The adsorption of U(Ⅵ)on UiO-66-NH2/30%PEI reached equilibrium within 60 min,and the adsorption process is fitted well with the quasi-second-order kinetic model and the Langmuir model with a maximum adsorption capacity of 452.49 mg/g.
作者
李仕友
胡忠清
王越
刘迎九
胡俊毅
荣丽杉
LI Shiyou;HU Zhongqing;WANG Yue;LIU Yingjiu;HU Junyi;RONG Lishan(Hunan Provincial Key Laboratory of Pollution Control and Resources Technology,University of South China,Hengyang 421001,China)
出处
《化工环保》
CAS
CSCD
北大核心
2020年第6期625-631,共7页
Environmental Protection of Chemical Industry
关键词
聚乙烯亚胺
氨基化锆基金属有机骨架
浸渍
铀
吸附
polyethylenimine
aminated zirconium-based metal organic framework(UiO-66-NH2)
impregnation
uranium
adsorption
