Fang Xiao-Hui, Chen Su-Hui, Yi Lan-Lin, Yin Zhong-Bin, Chen Yong-Jun, Jiang Hong, Li Chang-Jiu
State Key Laboratory of Marine Resource Utilization in South China Sea, Special Glass Key Lab of Hainan Province, Hainan University, Haikou 570228, China.
Key Laboratory of Advanced Materials of Tropical Island Resources of Ministry of Education, Haikou 570228, China.
Materials (Basel). 2021 May 18;14(10):2628. doi: 10.3390/ma14102628.
Oil pollution is caused by the frequent discharge of contaminated industrial wastewater and accidental oil spills and is a severe environmental and health concern. Therefore, efficient materials and processes for effective oil-water separation are being developed. Herein, SiO-NaSiO-coated stainless steel fibers (SSF) with underwater superoleophobic and low-adhesion properties were successfully prepared via a one-step hydrothermal process. The modified surfaces were characterized with scanning electron microscopy (SEM), and contact angle measurements to observe the surface morphology, confirm the successful incorporation of SiO, and evaluate the wettability, as well as with X-ray diffraction (XRD). The results revealed that SiO nanoparticles were successfully grown on the stainless-steel fiber surface through the facile hydrothermal synthesis, and the formation of sodium silicate was detected with XRD. The SiO-NaSiO-coated SSF surface exhibited superior underwater superoleophobic properties (153-162°), super-hydrophilicity and high separation efficiency for dichloromethane-water, n-hexane-water, tetrachloromethane-water, paroline-water, and hexadecane-water mixtures. In addition, the as-prepared SiO-NaSiO-coated SSF demonstrated superior wear resistance, long-term stability, and re-usability. We suggest that the improved durability may be due to the presence of sodium silicate that enhanced the membrane strength. The SiO-NaSiO-coated SSF also exhibited desirable corrosion resistance in salty and acidic environments; however, further optimization is needed for their use in basic media. The current study presents a novel approach to fabricate high-performance oil-water separation membranes.
油污是由受污染的工业废水频繁排放和意外溢油造成的，是严重的环境和健康问题。因此，正在开发用于有效油水分离的高效材料和工艺。在此，通过一步水热法成功制备了具有水下超疏油和低粘附性能的SiO-NaSiO包覆不锈钢纤维（SSF）。用扫描电子显微镜（SEM）对改性表面进行表征，并通过接触角测量来观察表面形貌、确认SiO的成功掺入以及评估润湿性，同时还用X射线衍射（XRD）进行表征。结果表明，通过简便的水热合成法，SiO纳米颗粒成功生长在不锈钢纤维表面，并且用XRD检测到了硅酸钠的形成。SiO-NaSiO包覆的SSF表面表现出优异的水下超疏油性能（153-162°）、超亲水性以及对二氯甲烷-水、正己烷-水、四氯化碳-水、煤油-水和十六烷-水混合物的高分离效率。此外，所制备的SiO-NaSiO包覆的SSF表现出优异的耐磨性、长期稳定性和可重复使用性。我们认为耐久性的提高可能归因于硅酸钠的存在，它增强了膜的强度。SiO-NaSiO包覆的SSF在含盐和酸性环境中也表现出良好的耐腐蚀性；然而，在碱性介质中的应用还需要进一步优化。当前的研究提出了一种制备高性能油水分离膜的新方法。
