Ultra-high flux loose nanofiltration membrane based on metal organic framework (CAU-10-H)/P84 co-polyimide for dye/salt fractionation from industrial waste water
Journal
Desalination
Journal Volume
586
Start Page
117871
ISSN
0011-9164
Date Issued
2024-10-01
Author(s)
Netsanet Kebede Hundessa
Chien-Chieh Hu
Pai-Chien Chou
Eyasu Gebrie Ajebe
Kueir-Rarn Lee
Juin-Yih Lai
DOI
10.1016/j.desal.2024.117871
Abstract
In recent times, loose nanofiltration (NF) membranes have gained popularity for the treatment of dye/salt industrial wastewater, primarily owing to their exceptional separation capabilities and economic advantages. However, achieving nanocomposite mixed matrix membranes with ultrahigh water permeance and specific pore and surface characteristics for effective dye and inorganic salt fractionation presents a significant challenge. This study focuses on the development of high-efficiency loose nanofiltration mixed matrix membranes (MMMs) achieved by combining polymers and porous nanoparticles. Metal-organic frameworks (MOFs) hold substantial promise as porous additives in MMMs. However, high-quality MOF-based MMMs for treating dye/salt aqueous solutions are still scarce. In this work, we synthesized an aluminum-based metal-organic framework (CAU-10-H) and utilized it in the fabrication of composite MMMs by blending it with co-polyimide (P84). We successfully created a thin and porous CAU-10-H/P84 layer with a significantly low MOF content (1.5 %) on a nylon support. Our research findings revealed that the optimized membrane exhibited desirable permeance (260.4 LMH/bar) for dye/salt solutions and a pure water permeance of 386.4 LMH/bar. Furthermore, the membrane demonstrated high dye rejection (99.2 % for methyl blue and 99.1 % for Congo red) while maintaining low salt rejection (4.8 % for NaCl and 16.3 % for Na2SO4). Additionally, the composite MMMs exhibited excellent stability throughout a 24-h filtration process. The CAU-10-H/P84 composite MMMs exhibit significant potential for applications in dye/salt fractionation.
Subjects
Dye/salt fractionation
Metal-organic framework
Mixed matrix membrane
Nanofiltration
P84 co-polyimide
Publisher
Elsevier BV
Type
journal article