| WU Jin-long,FU Yu-kun,LI Hao-qi,SHI Dong-mei,FAN Rui-juan,ZHANG Yong-lan,TAN Meng-yan,WANG Peng.Preparation and Oil-water Separation Performance of Underwater Superoleophobic Stainless Steel Mesh[J],52(9):358-367 |
| Preparation and Oil-water Separation Performance of Underwater Superoleophobic Stainless Steel Mesh |
| Received:July 13, 2022 Revised:December 13, 2022 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.09.032 |
| KeyWord:stainless steel mesh superhydrophilic underwater superoleophobic oil-water separation sepiolite carboxymethyl cellulose chitosan quaternary ammonium salt |
| Author | Institution |
| WU Jin-long |
School of Materials Science & Engineering, Yinchuan , China ;Key Laboratory of Polymer Materials and Manufacturing Technology,Yinchuan , China ;International Scientific & Technological Cooperation Base of Industrial Waste Recycling and Advanced Materials, Yinchuan , China |
| FU Yu-kun |
School of Materials Science & Engineering, Yinchuan , China ;Key Laboratory of Polymer Materials and Manufacturing Technology,Yinchuan , China |
| LI Hao-qi |
School of Materials Science & Engineering, Yinchuan , China ;Key Laboratory of Polymer Materials and Manufacturing Technology,Yinchuan , China |
| SHI Dong-mei |
School of Materials Science & Engineering, Yinchuan , China |
| FAN Rui-juan |
School of Biological Science & Engineering, North Minzu University, Yinchuan , China |
| ZHANG Yong-lan |
School of Materials Science & Engineering, Yinchuan , China |
| TAN Meng-yan |
School of Materials Science & Engineering, Yinchuan , China |
| WANG Peng |
School of Materials Science & Engineering, Yinchuan , China ;Key Laboratory of Polymer Materials and Manufacturing Technology,Yinchuan , China |
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| Abstract: |
| Materials with superwetting surface coating based on metal mesh substrates have attracted a large number of research interests in recent years. Herein, an effective superhydrophilic/underwater superoleophobic modified stainless steel mesh (SSM) material was manufactured by a facile strategy. The underwater superoleophobic stainless steel mesh was prepared by simple process of dip coating and liquid phase deposition, which was modified by natural polymers and inorganic materials for efficient oil-water mixture separation and bacterial inhibition. The original stainless steel mesh cleaned with ethanol, acetone and deionized water was successively put into 2 mol/L hydrochloric acid solution for oxide layer removal treatment for 16 h, and then it was immersed in 0.5wt.% sodium carboxymethyl cellulose solution and 0.5wt.% sepiolite nanoparticles dispersion solution for 1 hour sequentially. Sepiolite nanoparticles were obtained from 200 mesh sepiolite powder after ball milling at 600 r/min for 6 hours. After drying at 60 ℃ for 1 hour, the sample was immersed in 0.5wt.% chitosan quaternary ammonium salt solution for 1 hour to construct the superhydrophilic/underwater superoleophobic coating on the surface of stainless steel mesh. After drying at 60 ℃ for 1 hour, the modified superhydrophilic/underwater superoleophobic stainless steel mesh was obtained. The water contact angle and underwater oil contact angle were measured by contact angle measuring instrument (JC2000D2). The chemical composition analysis was recorded on Fourier transform infrared spectroscopy (FTIR, WQF-520A) with KBr pellets. The micromorphology and the distribution of elements on the samples surface were measured by field emission scanning electron microscopes (SEM, Zeiss SIGMA500). The antibacterial property of the sample was tested by the bacteriostatic halo experiment. The oil-water separation performance of the sample was tested by the independently built separation device. After modification, a coating with micro/nano structure was successfully constructed on the surface of the stainless steel mesh. It could be seen from the SEM images that the coating was a micro/nano structure formed by a large number of regular and orderly shape spindle shaped particles with diameters of tens to hundreds of nanometers. As carboxymethyl cellulose and chitosan quaternary ammonium salt had different charges respectively, they were combined through charge action. The two molecular chains contained a large number of —COOH and —NR groups, which could coordinate with Fe3+, Mg2+, Ca2+ and other metal ions contained on the surface of stainless steel mesh and sepiolite nanoparticles. A combination of multiple actions led to the formation of these spindle shaped nanoparticles with regular and orderly shape and superhydrophilic/underwater superoleophobic coating. Thus, the micro/nano rough structure was formed and the surface roughness of the stainless steel mesh was greatly increased. The contact angle of water in air on the modified stainless steel mesh nearly reached 0°. Meanwhile, the contact angles of different kinds of oil (Toluene, Diesel oil, Kerosene, Petroleum ether, Hexane, Gasoline) underwater on the modified stainless steel mesh were more than 150°, even though after immersion in acid, alkali and salt corrosive solutions for 8 h and scratching for 20 times. The separation efficiency was more than 98% for different oil-water mixtures, and could be still greater than 97% after 20 cycles of separation and immersion in acid, alkali and salt solution corrosion immersion for 8 h. After 48 h culture with bacteria, it was found that the superhydrophilic/underwater superoleophobic modified stainless steel mesh had a good inhibitory effect on the growth of Staphylococcus aureus. This was beneficial to the separation material in preventing bacterial contamination and might help to reduce the number of bacteria in the separated water. Therefore, a novel superhydrophilic/underwater superoleophobic separation membrane material based on the stainless steel mesh with green and simple fabrication process for efficiently separating various oil-water mixtures is provided. |
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