Jamshidifard Sana, Koushkbaghi Shahnaz, Hosseini Seyedehgolshan, Rezaei Sina, Karamipour Alireza, Jafari Rad Azadeh, Irani Mohammad
Faculty of Chemical Engineering, Iran University of Science & Technology, Tehran, Iran.
Science and Research Branch, Islamic Azad University, Yazd, Iran.
J Hazard Mater. 2019 Apr 15;368:10-20. doi: 10.1016/j.jhazmat.2019.01.024. Epub 2019 Jan 11.
In the present study, the UiO-66-NH MOF synthesized by microwave heating method was incorporated into the PAN/chitosan nanofibers for the removal of Pb(II), Cd(II) and Cr(VI) ions through the adsorption and membrane filtration processes. The synthesized MOFs and nanofibers were characterized using XRD, BET, FTIR, SEM, and DSC analysis. The effect of UiO-66-NH MOF content (0-15 wt.%), pH (2-7), contact time(5-90 min), metal ions initial concentration (20-1000 mg/L) and temperature (25-45 °C) was studied on the metal ions adsorption using PAN/chitosan/UiO-66-NH nanofibrous adsorbent. The kinetic, isotherm and thermodynamic parameters were evaluated to understand the metal ions adsorption mechanism using nanofibers. The Pseudo-second-order kinetic and Redlich-Peterson isotherm model were well described the experimental sorption data. In the heavy metal ions membrane filtration process, the different parameters such as MOF concentration (2-15 wt.%), membrane thickness (10-70 μm), metal ions concentration (5-50 mg/L), temperature (25-45 °C) and filtration time (1-24 h) were investigated on the performance of PVDF/ PAN/chitosan/UiO-66-NH nanofibrous membrane toward metal ions removal. The high water flux and high metal ions removal within 18 h filtration time showed the high potential of PVDF/ PAN/chitosan/UiO-66-NH membrane for the removal of metal ions from aqueous solutions.
在本研究中，通过微波加热法合成的UiO-66-NH金属有机框架被掺入到聚丙烯腈/壳聚糖纳米纤维中，以通过吸附和膜过滤过程去除Pb(II)、Cd(II)和Cr(VI)离子。使用X射线衍射（XRD）、比表面积测定（BET）、傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）和差示扫描量热法（DSC）分析对合成的金属有机框架和纳米纤维进行了表征。研究了UiO-66-NH金属有机框架含量（0-15 wt.%）、pH值（2-7）、接触时间（5-90分钟）、金属离子初始浓度（20-1000 mg/L）和温度（25-45°C）对使用聚丙烯腈/壳聚糖/UiO-66-NH纳米纤维吸附剂吸附金属离子的影响。评估了动力学、等温线和热力学参数，以了解使用纳米纤维吸附金属离子的机制。准二级动力学和雷德利希-彼得森等温线模型很好地描述了实验吸附数据。在重金属离子膜过滤过程中，研究了不同参数，如金属有机框架浓度（2-15 wt.%）、膜厚度（10-70μm）、金属离子浓度（5-50 mg/L）、温度（25-45°C）和过滤时间（1-24小时）对聚偏氟乙烯/聚丙烯腈/壳聚糖/UiO-66-NH纳米纤维膜去除金属离子性能的影响。在18小时过滤时间内的高水通量和高金属离子去除率表明聚偏氟乙烯/聚丙烯腈/壳聚糖/UiO-66-NH膜具有从水溶液中去除金属离子的巨大潜力。
