We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Nanoporous dopamine/β-cyclodextrin PES-PMACZ/MOF modified membrane for high-efficiency, low-fouling extraction of microplastics and PCB 209 from synthetic landfill leachate
Summary
Researchers engineered a modified filtration membrane incorporating metal-organic frameworks (MOFs) and dopamine/beta-cyclodextrin coatings to simultaneously remove microplastics and polychlorinated biphenyls (PCBs) from synthetic landfill leachate. The modified membrane achieved near-100% removal of microplastics and PCBs over multiple filtration cycles while resisting fouling — a common problem that reduces membrane performance over time. This dual-removal capability is significant because microplastics in landfill leachate often carry adsorbed toxic organic chemicals, and treating both together in one step is more efficient than separate processes.
• The PMACZ 20 /MOF 2 membrane achieved 100% removal of microplastics (2 µm polystyrene beads) under 5 cycles. • The membrane exhibited stable rejection performance across five filtration cycles, achieving and 99.67–100% removal of PCB 209 (50 ppb concentration) without notable efficiency loss. • The PMACZ 20 /MOF 2 modified matrix membrane showed outstanding fouling resistance against SLL with a final flow of 85%, demonstrating the effectiveness of optimal PMACZ and NH 2 −MIL101(Al) ratios in minimizing membrane fouling behavior. • Incorporating amino-functionalized MOF (NH₂-MIL101(Al)) and PMACZ into modified PES membranes (MMMs) enhanced PCB 209 adsorption by 60.27% and 2 µm microplastic adsorption by 4%, achieving up to 100% removal efficiency. This research focused on the development of 9 advanced Dopamine/β-Cyclodextrin modified polyethersulfone (PES) membranes, incorporating a polymer-coated magnetic activated biochar-zeolite composite (PMACZ) and NH 2 -MIL-101(Al) metal organic framework (MOF) in varying proportions. Membranes were designed for extraction of microplastics (MPs) and Decachlorobiphenyl (PCB 209) from synthetic landfill leachate (SLL). Characterization of the synthesized membranes was conducted using scanning electron microscopy and energy dispersive spectroscopy (SEM/EDS), Brunauer–Emmett–Teller (BET) analysis, X-ray diffraction (XRD), and raman spectroscopy. The membranes were evaluated for permeate flux, rejection efficiency, and fouling behavior. The membrane exhibiting optimal performance was selected for further examination, including cyclic stability, rejection and release performance, and pH tolerance. The rejection tests revealed complete removal of MPs and PCB 209 in water, while in SLL, removal rates were 100% for MPs and 99.67% for PCB 209. A decline in removal efficiency was observed with increased cycles. However, this decline was not significant. Release performance tests indicated negligible release (0% for MPs and 0.32% for PCB 209 in RO water; 0% for MPs and 0.8% for PCB 209 in SLL). Release of MPs under reversed flow conditions simulating backwash demonstrated rates of 95% and 93%. Notably, removal efficiencies exceeded 96% across all tested pH ranges, with optimal performance observed at pH levels of 5–8 for MPs and pH 8 for PCB 209, achieving complete removal. The membranes exhibited high permeability, 20 % enhanced fouling resistance, and exceptional rejection of both contaminants, affirming their potential for application in landfill leachate filtration.
Sign in to start a discussion.
More Papers Like This
A review on metal organic frameworks (MOFs) modified membrane for remediation of water pollution
This review covers how metal-organic framework (MOF) materials can be incorporated into membranes to improve filtration of pollutants from contaminated water. The technology shows promise for removing microplastics and chemical contaminants, though most applications remain at laboratory scale.
Advances in metal-organic frameworks for microplastic removal from aquatic environments: Mechanisms and performance insights
Researchers reviewed over 65 studies on using metal-organic frameworks (MOFs) — highly porous, sponge-like materials — to remove microplastics from water, finding some MOFs achieved up to 98% removal efficiency and could be reused six times, making them a promising filtration technology for microplastic pollution.
A hybrid LMO MOF catalytic membrane with PMS activation for efficient degradation of pharmaceutical micropollutants and nanoplastics removal
Researchers developed a hybrid catalytic membrane combining metal-organic frameworks with layered metal oxides for degrading pharmaceutical micropollutants and removing nanoplastics from water. The membrane achieved 95-99.5% degradation of several micropollutants and 98.5% removal of polystyrene nanoplastics. The study demonstrates a dual-function water treatment approach that addresses both chemical and plastic particle contamination simultaneously.
Metal-organic framework membrane for waterborne micro/nanoplastics treatment
Researchers reviewed the potential of metal-organic framework (MOF) membranes — materials with highly tunable pore structures — to filter micro- and nanoplastics from water more effectively than conventional filtration. MOF membranes showed promise due to their adjustable surface chemistry and resistance to biological fouling, though challenges like particle clumping and structural stability still need to be resolved.
Emerging PMS-Based LMO–COF Membrane with Improved Stability for the Mineralization of Micropollutants and Rejection of Nanoplastics from Wastewater
Researchers developed a novel layered metal oxide-covalent organic framework (LMO-COF) membrane integrated with peroxymonosulfate oxidation to simultaneously remove pharmaceutical micropollutants and nanoplastics from wastewater, achieving improved stability and mineralization performance.