Novel Mixed Matrix Membranes Based on Polymer of Intrinsic Microporosity PIM-1 Modified with Metal-Organic Frameworks for Removal of Heavy Metal Ions and Food Dyes by Nanofiltration

Abstract

Nowadays, nanofiltration is widely used for water treatment due to its advantages, such as energy-saving, sustainability, high efficiency, and compact equipment. In the present work, novel nanofiltration membranes based on the polymer of intrinsic microporosity PIM-1 modified by metal-organic frameworks (MOFs)—MIL-140A and MIL-125—were developed to increase nanofiltration efficiency for the removal of heavy metal ions and dyes. The structural and physicochemical properties of the developed PIM-1 and PIM-1/MOFs membranes were studied by the spectroscopic technique (FTIR), microscopic methods (SEM and AFM), and contact angle measurement. Transport properties of the developed PIM-1 and PIM-1/MOFs membranes were evaluated in the nanofiltration of the model and real mixtures containing food dyes and heavy metal ions. It was found that the introduction of MOFs (MIL-140A and MIL-125) led to an increase in membrane permeability. It was demonstrated that the membranes could be used to remove and concentrate the food dyes and heavy metal ions from model and real mixtures.

Novel Mixed Matrix Membranes Based on Polyphenylene Oxide Modified with Graphene Oxide for Enhanced Pervaporation Dehydration of Ethylene Glycol

“…The pre-determined amount of polymer powder was ground with the calculated quantity of GO (0.1, 0.3, 0.5, 0.7, 0.9 wt.% with respect to the polymer weight). The obtained composite was dissolved in chloroform under constant stirring for 3 h at ambient temperature to obtain 8 wt.% PPO solution with the consequent ultrasonic treatment for 30 min at ambient temperature for degassing the polymer solution [35]. Dense PPO and PPO/GO membranes were formed by solvent evaporation technique: pouring pre-determined PPO solution or composite onto the cellophane surface fixed on a hollow steel ring, drying in an oven at 40 • C for 12 h to remove the solvent, and then separating the membrane from the cellophane following [36].…”

Novel Thin Film Nanocomposite Membranes Based on Chitosan Succinate Modified with Fe-BTC for Enhanced Pervaporation Dehydration of Isopropanol

“…One of the other effective methods to improve membrane performance is the modification of polymer matrix with nanoparticles [ 39 ] such as fullerene derivatives [ 40 ], carbon nanotubes (CNTs) [ 41 ], graphene oxides [ 42 ], metals and their oxides [ 43 , 44 ], metal-organic frameworks (MOFs) [ 45 , 46 ], silica [ 47 ], etc. Membranes with MOF as a nano-filler have great prospects due to the design simplicity and the possibility of modifying MOFs, as well as the compatibility between MOF and the polymer matrix [ 48 ]. Additionally, the MOF introduction into the membrane significantly affects the sorption characteristics, surface hydrophilic-hydrophobic balance, and the free volume of the polymer film due to the MOF porous structure, leading to enhanced transport properties (the increase in the permeation flux and/or selectivity).…”

Effects of Benzalkonium Chloride Contents on Structures, Properties, and Ultrafiltration Performances of Chitosan-Based Nanocomposite Membranes

“…The maximum wavelength of the BSA solutions was detected at 720 nm. The water flow velocity over time regarding the membrane water permeability [ 38 ] and the membrane rejection corresponding to the number of particles that were removed from the feed water [ 39 ] were calculated using the equations reported in our previous work [ 33 , 40 ].…”