Huang Jingda, Li Mengmeng, Lu Youwei, Ren Changying, Wang Siqun, Wu Qiang, Li Qian, Zhang Wenbiao, Liu Xianmiao
School of Engineering, Zhejiang A&F University Hangzhou 311300 China
Center for Renewable Carbon, University of Tennessee Knoxville Tennessee 37996 USA
RSC Adv. 2021 Apr 13;11(23):13992-13999. doi: 10.1039/d1ra02291a.
A superhydrophobic stainless steel mesh (called "mesh" in short) is an ideal device to solve oil pollution accidents by oil-water separation. However, its widespread application is prevented by complicated preparation, weak durability, and particularly poor mechanical strength. It is well known that the used adhesives play a key role in the mechanical strength of superhydrophobic coatings. In this study, polyvinylidene fluoride (PVDF) and polydimethylsiloxanes (PDMSs) were respectively used as adhesives and lignin-nanocellulose crystal (L-CNC) particles as main structure materials to prepare L-CNC coated superhydrophobic meshes. Moreover, the meshes coated with L-CNC/PVDF and L-CNC/PDMS were compared with respect to the properties of wettability, sandpaper abrasion, oil-water separation, The results showed that the L-CNC/PVDF-coated mesh had a higher water contact angle (WCA = 154.2°) than the L-CNC/PDMS-coated one (WCA = 152.6°), but worse abrasion resistance. Both of them showed high-efficiency oil/water separation with collection rates above 94.5% and stable reusable ability as the oil collection rates for toluene was still above 93.8% after reusing thirty times, meanwhile showing good heat, UV, acid and alkaline resistance properties.
超疏水不锈钢网（以下简称“网”）是一种通过油水分离解决油污事故的理想装置。然而，其复杂的制备工艺、较弱的耐久性，尤其是较差的机械强度阻碍了它的广泛应用。众所周知，所用的粘合剂在超疏水涂层的机械强度中起着关键作用。在本研究中，分别使用聚偏氟乙烯（PVDF）和聚二甲基硅氧烷（PDMS）作为粘合剂，木质素-纳米纤维素晶体（L-CNC）颗粒作为主要结构材料来制备L-CNC涂层超疏水网。此外，还对涂覆有L-CNC/PVDF和L-CNC/PDMS的网在润湿性、砂纸磨损、油水分离等性能方面进行了比较。结果表明，涂覆有L-CNC/PVDF的网比涂覆有L-CNC/PDMS的网具有更高的水接触角（WCA = 154.2°对WCA = 152.6°），但耐磨性较差。它们都表现出高效的油水分离性能，收集率高于94.5%，并且具有稳定的可重复使用能力，因为甲苯的收集率在重复使用30次后仍高于93.8%，同时还表现出良好的耐热、耐紫外线、耐酸和耐碱性能。
