| LYU Zhenbei,PENG Wenhai,PAN Wentao,XUE Wei,PENG Delian,WANG Chunsun.Preparation and Study of High Performance Attapulgite-polytetrafluoroethylene Membrane[J],53(10):230-242 |
| Preparation and Study of High Performance Attapulgite-polytetrafluoroethylene Membrane |
| Received:May 24, 2023 Revised:September 26, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.10.019 |
| KeyWord:attapulgite polytetrafluoroethylene micro-nanostructure superhydrophobicity oil-water separation |
| Author | Institution |
| LYU Zhenbei |
School of Mechanical and Electrical Engineering,Zhejiang Wenzhou , China |
| PENG Wenhai |
School of Mechanical and Electrical Engineering,Zhejiang Wenzhou , China ;International Science and Technology Cooperation Base of Laser processing Robot, Wenzhou University, Zhejiang Wenzhou , China;Wenxiong Holdings Group Co., Ltd., Zhejiang Wenzhou , China |
| PAN Wentao |
School of Mechanical and Electrical Engineering,Zhejiang Wenzhou , China |
| XUE Wei |
School of Mechanical and Electrical Engineering,Zhejiang Wenzhou , China ;International Science and Technology Cooperation Base of Laser processing Robot, Wenzhou University, Zhejiang Wenzhou , China |
| PENG Delian |
Wenxiong Holdings Group Co., Ltd., Zhejiang Wenzhou , China |
| WANG Chunsun |
Wenxiong Holdings Group Co., Ltd., Zhejiang Wenzhou , China |
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| Abstract: |
| Due to the increase of industrial oily wastewater and frequent oil spill accidents, the preparation of high-performance separation membrane has received great attention. Recently, the membrane with special surface wettability has been widely used in the practical application of oil-water separation because of its good separation effect. However, in practice, the preparation process of the membrane with special surface wettability is not only complex, but also costly, and the oil-water separation performance of the membrane is poor. The preparation methods of most oil-water separation membranes are usually two steps:construct a graded rough surface, and then chemically modify the surface with low surface energy materials, which is tedious and time-consuming, and the use of a large number of chemical reagents may cause secondary pollution and other side effects. Here, the work proposes a simple, low-cost and efficient method. First, the polytetrafluoroethylene membrane is punched by laser, and then the attapulgite is modified with octadecyl trichlorosilane to prepare hydrophobic attapulgite. In order to increase the adhesion between attapulgite and polytetrafluoroethylene substrate, waterborne polyurethane is usually added, and the prepared attapulgite- polytetrafluoroethylene membrane has superhydrophobic properties. It has good oil-water separation function. That is, the high performance attapulgite-polytetrafluoroethylene separation membrane is prepared by spraying attapulgite after piercing PTFE by picosecond laser. The results show that the prepared attapulgite-polytetrafluoroethylene separation membrane has hydrophobicity, and its surface forms a unique and rough micro-nano structure through the superposition of drilling and spraying technology. The contact angles in the tested samples are all above 150°and have superhydrophobic properties. This superhydrophobic characteristic is mainly caused by the superposition of dense micropore structure and micro-nanometer protruding rough structure of the sprayed membrane. In addition, in order to verify the performance of the separation membrane, the invasion pressure of water is introduced. Because the membrane is not sprayed with attapulgite, water flows through the membrane into the glass bottle, indicating that the membrane does not have the resistance to water. However, after spraying attapulgite, the water is blocked in the upper glass tube and maintains a certain height, and the maximum water height that the membrane can bear is about 15.6 cm. It can be calculated from the formula that the invasion pressure after spraying is about 1.5 kPa. The reason for the above two phenomena is that the surface roughness of the membrane is different, resulting in different hydrophobic properties, so that the membrane has different resistance to water. In the process of oil-water separation, when the micropore diameter of the membrane is less than 200 μm, the oil-water separation efficiency is more than 98.0%. More importantly, the separation efficiency of the prepared membrane does not change significantly after severe wear or 40 separation cycles, and the separation efficiency is still above 96.0%, and it still has good wetting performance and oil-water separation performance after being soaked in corrosive media such as strong acid and alkali for 24 hours, indicating that the membrane has good durability and stability. These works provide a new way for us to quickly prepare high performance separation membranes. The superhydrophobic APT-PTFE membrane prepared in this paper can be widely used in practical process because of its excellent performance. |
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