摘要
采用溶剂热法以摩尔比n_(Zn)∶n_(Fe)∶n_(Htfbdc)为1∶2∶3制备了新型的吸附PFOS的氟化双金属MOFs材料F-Zn-Fe-MOF.XRD、SEM、FT-IR和物理吸附等表征结果显示,F-Zn-Fe-MOF为P_(21)单斜晶空间型,外表呈粒径约为125 nm的片状纺锤体,含C-F键且存在分布最广的7 nm左右介孔的微、介孔混合材料.对其吸附性能的影响因素及吸附过程的动力学和热力学行为进行了研究,结果表明,其饱和吸附容量为30.14 mg/g,吸附过程符合准二级动力学模型和Freundlich等温模型,说明F-Zn-Fe-MOF对PFOS的吸附以多分子层化学吸附为主,该吸附过程为一自发的放热过程.而解吸实验表明:该材料吸附性好而难以解吸,具有作为PFOS钝化剂的潜质.将该材料应用于吸附环境水体为本底的模拟水样中的PFOS,其去除率在80%~95%之间,远远超过目前污染水体最高浓度730 ng/L下的污染量.
A novel fluorinated bimetallic MOFs material F-Zn-Fe-MOF for adsorbtion of PFOS was prepared by solvothermal method at molar ration_(Zn)∶n_(Fe)∶n_(Htfbdc) as 1∶2∶3.The characterization results of XRD,SEM,FT-IR and physical adsorption show that F-Zn-Fe-MOF is a P 21 single oblique crystal spatial type,and its appearance is a sheet-like spindle with a particle size of about 125 nm,it is the micro-mesoporous hybrid material with C-F bonds and the most widely distributed mesoporous about 7 nm.The influencing factors of its adsorption performance and the kinetic and thermodynamic behavior of the adsorption process were studied.The results show that the saturation adsorption capacity is 30.14 mg/g,and the adsorption process conforms to the quasi-secondary kinetic model and the Freundlich isothermal model,indicating that the adsorption of PFOS by F-Zn-Fe-MOF is dominated by multi-molecular layer chemical adsorption,and the adsorption process is a spontaneous exothermic process.The desorption experiment shows that the material has good adsorption performance and is difficult to desorption,and has the potential as a PFOS passivator.The material was applied to adsorb PFOS in the simulated water sample with environmental water as the background,and its removal rate was between 80%and 95%,far exceeding the pollution amount at the maximum concentration of 730 ng/L of polluted water.
作者
周嫄
陈文
朱霞萍
魏嘉勋
梁永强
ZHOU Yuan;CHEN Wen;ZHU Xia-ping;WEI Jia-xun;LIANG Yong-qiang(College of Materials and Chemistry&Chemical Engineering,Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institution,Chengdu University of Technology,Chengdu 610059,China)
出处
《陕西科技大学学报》
北大核心
2022年第6期93-100,121,共9页
Journal of Shaanxi University of Science & Technology
基金
四川省地质矿产勘查开发局科技创新项目(KJCX-2020-007)。
作者简介
周嫄(1998-),女,四川南充人,在读硕士研究生,研究方向:应用化学;通讯作者:陈文(1965-),女,四川成都人,教授,博士,研究方向:分析化学、元素的定量分离与富集,chenwen2010@foxmail.com。
