Facile fabrication of superhydrophobic porous materials using the water-based aza-Michael reaction for high-efficiency oil-water separation

作者：Kang, Lei^*; Shi, Lanjie; Song, Longfei; Guo, Xingpeng

来源：SEPARATION AND PURIFICATION TECHNOLOGY, 2023, 308: 122880.

DOI：10.1016/j.seppur.2022.122880

• Superhydrophobic
• Aza-Michael reaction
• Water -based
• Oil -water separation

Superhydrophobic porous materials are widely used in oil-water separation due to their water-blocking and oil -passing properties. However, the preparation of most superhydrophobic porous materials is generally energy -intensive and must be performed using organic solvents. In this study, we describe a straightforward and cost-effective strategy for fabricating superhydrophobic coatings on nanosized soil particle-modified stainless steel mesh (SSM). The coating is prepared via the aza-Michael reaction of stearyl acrylate and melamine-ure-a-formaldehyde (MUF) resin catalysed by methyl cyclodextrin in water. Superhydrophobic meshes with water contact angles (WCAs) exceeding 150 degrees are obtained, exhibiting extraordinary water repellency. The super -hydrophobic mesh also effectively prevents surface contamination, creating a self-cleaning surface that is both waterproof and dustproof. Most importantly, the superhydrophobic mesh presents excellent oil separation per-formance for oil-water mixtures of various compositions, maintaining extremely high separation efficiency (>98%) even after 80 cycles. Additionally, we successfully apply this strategy to the preparation of super -hydrophobic melamine sponges with excellent oil adsorption capacity (17.6-44.2 g/g). This innovative study provides an effective strategy for designing biomimetic superhydrophobic surfaces and is a promising devel-opment in the field of environmentally friendly oil-water separators.

• 单位
  广州大学