Efficient Thin Film Membranes Incorporated with SO3H Functionalized MOF for Copper and Lead Removal from Water; Fabrication, Characterization and Adsorption Kinetics

G. Seema, A. Maliha, M. Aamir, M. Nouman
International Islamic university islamabad,

Keywords: Adsorption Kinetics, Interfacial polymerization, Metal ions, Zr-MOF, TFNs


SO3H-functionalized thin film nanocomposite (TFN) membranes were fabricated via interfacial polymerization method for the removal of Cu (II) and Pb (II) from water. Various weight percentages of SO3H-functionalized (Zirconium based) metal organic framework (MOF) were integrated in TFNs to get excellent permeability and selectivity of membranes. XRD proves that fine TFN membranes with finger-like nano-channels and uniform distribution of MOF particles were obtained with 0.2 wt% of MOF. Adsorption capacity of TFN membrane with 0.2 wt% of SO3H-MOF (429 mg/g) was more than TFC (without MOF) membrane (380 mg/g) at 25℃ and pH6 for Cu (II). Both equilibrium isotherms and kinetic orders for adsorption were investigated. Kinetic and isotherms data calculated with different time intervals have been analyzed by pseudo first order, pseudo second order, intraparticular diffusion equations, and Langmuir, Freundlich isotherms. The experimental data fitted well to both Langmuir and Freundlich isotherms and also followed a kinetic model of pseudo second order for Cu (II) and Pb (II). The mechanism was confirmed generally as a monolyer physical adsorption and coordination interaction between metal ions and TFNs adsorption system.