Investigation on Amino-Induced In-Situ Interfacial Copolymeri-zation Nanofiltration Membranes for Dye-Containing Wastewater Separation
DOI:
https://doi.org/10.12974/2311-8717.2026.14.03Keywords:
Textile wastewater, Nanofiltration membrane, Metal-organic framework, UiO-66-NH2, Interfacial polymerization, Dye rejectionAbstract
To address the demand for efficient dye separation and salt recovery in textile wastewater treatment, this study proposes a fabrication strategy for composite nanofiltration (NF) membranes modified with UiO-66-NH2. This approach involves introducing varying proportions of UiO-66-NH2 into the aqueous phase solution during interfacial polymerization. By leveraging the abundant amino active sites on the UiO-66-NH2 to undergo covalent reactions with acyl chloride monomers in the organic phase, in-situ chemical bonding between the MOF material and the polyamide (PA) separation layer was achieved concurrently with the interfacial polymerization of piperazine (PIP) and trimesoyl chloride (TMC). This method significantly enhanced the interfacial compatibility between the MOF nanoparticles and the polymer matrix, successfully yielding a series of thin-film nanocomposite (TFN) membranes with robust interfacial bonding characteristics. The incorporation of UiO-66-NH2 markedly improved membrane permeability and optimized its rejection performance toward various dyes. At an optimal loading of 0.15 wt%, the pure water flux of the composite membrane reached 45.77 L·m-2·h-1, representing an increase of more than 80% compared with the pristine membrane (24.65 L·m-2·h-1). Meanwhile, rejection efficiencies for methyl blue (MeB) and congo red (CR) were as high as 98.0%, while methyl orange (MO) and methylene blue (MB) achieved rejections exceeding 75.0% (75.6% and 83%, respectively). The membrane also exhibited good operational stability during a 12 h continuous filtration test, maintaining a flux decline of less than 8.5% and dye rejection rates stably maintained above 98% (for CR) and 75% (for MO), respectively. UiO-66-NH2 was uniformly incorporated into the PA network and formed stable covalent bonds, which effectively regulated the physicochemical properties of the membrane surface and separation channels, thereby simultaneously enhancing the water flux and dye rejection efficiency. This study provided an effective approach for developing NF membranes with high water permeability, high retention rate, and good stability for dye wastewater treatment.
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