| YU Yin-rui,YAN Chao,QU Qi,ZHANG Xian-hua,ZHANG Zi-ming,HE Yan,XU Jin.Effects of Magnetic Field-induced Low-dimensional Magnetic Carbon Materials on the Structure and Flow Characteristics of Polysulfone Membranes[J],52(11):355-365 |
| Effects of Magnetic Field-induced Low-dimensional Magnetic Carbon Materials on the Structure and Flow Characteristics of Polysulfone Membranes |
| Received:September 09, 2022 Revised:March 08, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.11.030 |
| KeyWord:magnetic carbon nanomaterials microreactor polysulfone magnetic field-induced hybrid matrix membrane |
| Author | Institution |
| YU Yin-rui |
School of Mechanical and Electrical Engineering, Qingdao University of Science and Technology, Shandong Qingdao , China |
| YAN Chao |
School of Mechanical and Electrical Engineering, Qingdao University of Science and Technology, Shandong Qingdao , China |
| QU Qi |
School of Mechanical and Electrical Engineering, Qingdao University of Science and Technology, Shandong Qingdao , China |
| ZHANG Xian-hua |
School of Mechanical and Electrical Engineering, Qingdao University of Science and Technology, Shandong Qingdao , China |
| ZHANG Zi-ming |
School of Mechanical and Electrical Engineering, Qingdao University of Science and Technology, Shandong Qingdao , China |
| HE Yan |
School of Mechanical and Electrical Engineering, Qingdao University of Science and Technology, Shandong Qingdao , China |
| XU Jin |
School of Mechanical and Electrical Engineering, Qingdao University of Science and Technology, Shandong Qingdao , China |
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| Abstract: |
| The magnetic force is used to attract hydrophilic magnetic carbon nanomaterials to the membrane surface during the formation of the membrane, which can attach hydrophilicity and magnetism to the membrane surface. This changes the physicochemical properties of the membrane surface, improves the permeate flux of the membrane, and solves or minimizes membrane contamination problems. Magnetic carbon nanomaterials (MCN) with excellent magnetic properties were prepared by introducing triiron tetroxide (Fe3O4) by a one-step hydrothermal method after premixing the graphene oxide/carbon nanotube mixture solution with Fe3+ and Fe2+ by passing it into a microreactor. The microreactor could provide microchannels and anaerobic environment to protect Fe2+ from oxidation while achieving uniform mixing of the two solutions. The one-step hydrothermal method provided a mild environment to promote the complete nucleation and growth of Fe3O4, and the magnetic carbon nanomaterials with uniform Fe3O4 distribution could be prepared quickly and easily. The magnetic hybrid matrix membrane (PSF/MCN) was prepared by magnetic field-induced non-solventogenic phase separation (NIPS) with co-blending MCN in polysulfone (PSF) substrate. The morphological structure and magnetic properties of MCN were characterized, and the effect of the directional migration of MCN on the morphological structure and properties of the film surface was investigated by changing the PSF concentration. The results showed that the saturation magnetization strength of hydrophilic magnetic MCN was as high as 53.17 emu/g (1 emu/g=1 A.m2/kg), which exhibited superparamagnetism and the MCN moved toward the membrane surface under the action of magnetic field. The membrane surfaces with different PSF contents exhibited different morphological characteristics under the same magnetic field strength, and the composition of membrane surface roughness changed from fine and dense fluctuations to broad floating during the increase of PSF concentration from 15% to 17.5%. It was shown that when the PSF concentration was between 15% and 17.5%, the MCN on the membrane surface changed from relatively complete movement to the surface to incomplete movement to the surface, and the change of PSF concentration affected the shedding of MCN on the membrane surface. In addition, the addition of MCN improved the internal structure and circulation characteristics of the membrane, and the average pore size of the membrane increased from 0.034 1 nm to 1.186 5 nm when the PSF content was 15%. Compared with pure PSF membranes at the same concentration, the hydrophilic angle of PSF/MCN decreased by 18.34%, 15.37%, 14.69%, 18.43%, and its pure water flux increased by 32.51%, 23.62%, 167.27%, 233.88% and its retention rate of bovine albumin (BSA) was above 90%, which exhibited good selective permeability. The addition of MCN improves the hydrophilicity of the separation membrane, thus facilitating the rapid phase transition process. In addition, under the action of magnetic field force, MCN migrates to the surface of the separation membrane, which greatly increases the amount of hydrophilic groups on the membrane surface and improves the permeation characteristics of the separation membrane. At the same time, MCN is uniformly dispersed on the membrane surface, which nearly forms a protective film and improves the separation characteristics and contamination resistance of the membrane. |
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