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Polyamide composite membranes for enhanced organic solvent nanofiltration performance by metal ions assisted interfacial polymerization method |
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| Authors: | Dayuan Zheng Dan Hua Xi Cheng Junyang Pan Abdul-Rauf Ibrahim Haiming Hua Peng Zhang Xingwen Cha Kaiji Xu Guowu Zhan |
| Affiliation: | 1. College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Huaqiao University, Xiamen, Fujian, China Contribution: Data curation (lead), Investigation (lead), Writing - original draft (lead);2. College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Huaqiao University, Xiamen, Fujian, China;3. College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Huaqiao University, Xiamen, Fujian, China Contribution: Data curation (supporting);4. Department of Mechanical Engineering, Faculty of Engineering and Built Environment, Tamale Technical University, Education Ridge Avenue, Tamale, Ghana Contribution: Writing - original draft (supporting), Writing - review & editing (supporting);5. College of Energy & School of Energy Research, Xiamen University, Xiamen, Fujian, China Contribution: Data curation (supporting), Methodology (supporting);6. College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Huaqiao University, Xiamen, Fujian, China Contribution: Data curation (supporting), Methodology (supporting);7. College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Huaqiao University, Xiamen, Fujian, China Contribution: Methodology (supporting) |
| Abstract: | Herein, thin-film composite membranes consisting of poly(m-phenyleneisophthalamide) substrate and polyamide active layer were constructed by transition metal ion-assisted interfacial polymerization method. As compared to the traditional polyamide membranes, a much thinner polyamide layer (33 vs. 200 nm) can be synthesized with higher permeance (3.2 vs. 0.62 L m−2 h−1 bar−1) in the organic solvent nanofiltration. Similarly, the prepared membranes maintained a high rejection (>99%) for various dyes. Optimal membranes prepared by using Co2+ exhibited strong tolerance to various organic solvents with good long-term stability. Positron annihilation spectroscopy and other characterization methods were used to investigate the relationships between the membrane microstructures and the enhanced separation performance. Based on molecular dynamics simulation, it was found that the diffusion coefficient of polyethyleneimine monomer decreased by about 18 times after adding Co2+ to the aqueous solution (forming coordination interaction). This procedure has great potential and sustainability for practical organic solvent nanofiltration applications. |
| Keywords: | interfacial polymerization ionic liquid organic solvent nanofiltration thin-film composite membranes transition metal ions |