Abstract
The incorporation of various nanofillers into the interfacial polymerization (IP) process is widely applied to prepare higher performance NF membranes. However, few studies have reported the influence of nanofillers on nanocomposite membrane formation in the IP process. Here, an optical microscope was employed to study the change rule in the 8-NH2-POSS/PSA nanocomposite membrane formation process due to the addition of 8-NH2-POSS nanoparticles. First, the addition of 8-NH2-POSS reduced the diffusion rate of the polyacrylamide hydrochloride (PAH) water phase on the surface against the oil phase because of the interaction with the PAH molecules. Furthermore, the 8-NH2-POSS/PSA nanocomposite membrane structure was more homogeneous and exhibited uniform pinhole defects distribution due to the interaction of the 8-NH2-POSS nanoparticles to the PAH segment. A significant separation performance was observed in the 8-NH2-POSS/PSA nanocomposite membrane due to the hydrophilicity and positive charge of the 8-NH2-POSS nanoparticles. The permeation flux and MgCl2 rejection of the 8-NH2-POSS/PSA nanocomposite membrane increased up to 50.5 L/m2 h at 0.5 MPa and 94.8%, respectively, which corresponded to increases of 73.5% and 8.7% as compared to the pristine PSA membrane. 8-NH2-POSS/PSA nanocomposite membranes have great application potential in the water softening and treatment of divalent metals ions under acidic conditions.
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Acknowledgements
The financial support for this work is from the National Natural Science Foundation of China (No. 21464012), the funds for dual first-class discipline of Shihezi university (SHYL-YB201806), the funds for innovation and development of Shihezi university (CXFZ201909), the Program for Changjiang Scholars and Innovative Research Team in University (No. IRT_15R46) and Bingtuan Innovation Team in Key Areas (2015BD003).
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Sheng, A., Wang, H., Jiang, H. et al. Structurally ordered nanofiltration membranes prepared by spatially anchoring interfacial polymerization for highly efficient separation properties. Korean J. Chem. Eng. 38, 1956–1969 (2021). https://doi.org/10.1007/s11814-021-0837-x
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DOI: https://doi.org/10.1007/s11814-021-0837-x