材料科学
矿物油
接触角
乳状液
膜
化学工程
油滴
废水
生物污染
环境友好型
聚偏氟乙烯
云母
纳米-
制浆造纸工业
复合材料
化学
聚合物
环境工程
环境科学
冶金
工程类
生物
生物化学
生态学
作者
Yan Bao,Bin Wang,Conghui Du,Qiuhui Shi,Wenlong Xu,Zhining Wang
出处
期刊:Nanomaterials
[MDPI AG]
日期:2022-08-23
卷期号:12 (17): 2895-2895
被引量:3
摘要
Oil-polluted water has become one of the most important environmental concerns nowadays due to the increasing industrial oily wastewater and frequent oil spill accidents. Herein, a novel two-dimensional (2D) nano-mica sheets assembled composite membrane with underwater super-oleophobic properties was developed for effective oil/water separation. A 2D nano-mica sheet was synthesized by a facile solvent-assisted ultrasonic exfoliation and then the obtained 2D nano-mica sheets were co-deposited with dopamine on polyvinylidene fluoride substrate to prepare nano-mica composite membranes (NCM). The NCM is hydrophilic in air and super-oleophobic underwater (the water contact angle in the air is 37.6°, and the oil contact angle in water is 151.4°). Furthermore, the prepared NCM provided outstanding stability in different acid-base environments (pH = 1-11). Noteworthily, the oil removal rate is higher than 99.5% as the sodium dodecyl sulfate SDS-stabilized oil (soya-bean oil, mineral oil and pump oil) -in-water emulsions. Meanwhile, the NCM showed excellent reusability, as the oil removal efficiency kept at 99.0% after ten soya-bean oil-in-water or mineral oil-in-water emulsion filtration cycles. The present work paved a new way for developing a low-cost and environmentally friendly strategy for oily wastewater treatment and developed a high-increment utilization application field for natural minerals.
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