Loading...
Please wait, while we are loading the content...
Similar Documents
The Intrinsic Parameters of the Polyamide Nanofilm in Thin-Film Composite Reverse Osmosis (TFC-RO) Membranes: The Impact of Monomer Concentration
| Content Provider | MDPI |
|---|---|
| Author | Zhang, Mengling Hu, Xiangyang Peng, Lei Zhou, Shilin Zhou, Yong Xie, Shijie Song, Xiaoxiao Gao, Congjie |
| Copyright Year | 2022 |
| Description | The realistic resistance zone of water and salt molecules to transport across a TFC-RO membrane is the topmost polyamide nanofilm. The existence of hollow voids in the fully aromatic polyamide (PA) film gives its surface ridge-and-valley morphologies, which confuses the comprehensions of the definition of the PA thickness. The hollow voids, however, neither participate in salt–water separation nor hinder water penetrating. In this paper, the influence of intrinsic thickness (single wall thickness) of the PA layer on water permeability was studied by adjusting the concentration of reacting monomers. It confirms that the true permeation resistance of water molecules originates from the intrinsic thickness portion of the membrane. The experimental results show that the water permeability constant decreases from 3.15 ± 0.02 to 2.74 ± 0.10 $L·m^{−2}·h^{−1}·bar^{−1}$ when the intrinsic thickness of the membrane increases by 9 nm. The defects on the film surface generate when the higher concentration of MPD is matched with the relatively low concentration of TMC. In addition, the role of MPD and TMC in the micro-structure of the PA membrane was discussed, which may provide a new way for the preparation of high permeability and high selectivity composite reverse osmosis membranes. |
| Starting Page | 417 |
| e-ISSN | 20770375 |
| DOI | 10.3390/membranes12040417 |
| Journal | Membranes |
| Issue Number | 4 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-04-11 |
| Access Restriction | Open |
| Subject Keyword | Membranes Polymer Science Polyamide Intrinsic Thickness Defects Permeability |
| Content Type | Text |
| Resource Type | Article |
