Universal Rapid Demulsification by Vacuum Suction Using Superamphiphilic and Underliquid Superamphiphobic Polyurethane/Diatomite Composites.
Universal Rapid Demulsification by Vacuum Suction Using Superamphiphilic and Underliquid Superamphiphobic Polyurethane/Diatomite Composites.
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DOI：
10.1021/acsami.2c03967
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发表时间：
2022-05
影响因子：
9.5
通讯作者：
Pan Wu;Qiuxian Luo;Xingyang Zhang;Jian He;Changjun Liu;Wei Jiang
中科院分区：
文献类型：
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作者：
Pan Wu;Qiuxian Luo;Xingyang Zhang;Jian He;Changjun Liu;Wei Jiang
开发了一种利用所制备的超两亲性和欠液体超两亲性聚氨酯(PU)/硅藻土复合材料通过真空抽吸进行通用快速破乳的方法，并用于在有或没有表面活性剂的情况下对水中煤油和煤油中水乳状液的破乳。结果表明，经长期运行，所有乳状液的破乳率均在98.5%以上，稳定的破乳速度在0.303 L/m2/min以上。当加入超疏水通道进行分离时，油水分离效率超过99.0%，最终产品为合格的油水。PU/硅藻土的这一诱人的普遍破乳能力源于其在液体下的超疏水性，它吸引连续相形成稳定的液膜，从而排斥分散相液滴，这些分散相液滴与表面具有类似的相互作用，但要少得多。真空迫使乳液滴进入PU/硅藻土滤饼的微观结构，在那里它们被压缩、结合，最后被破乳。这一观察到的机理为避免油垢在破乳过程中的负面影响，实现大规模通用连续快速破乳提供了一种有前景的策略。
A process for universal rapid demulsification by vacuum suction using an as-prepared superamphiphilic and underliquid superamphiphobic polyurethane (PU)/diatomite composite has been developed and is used to demulsify kerosene-in-water and water-in-kerosene emulsions with and without a surfactant. The results show that the demulsification rate of all the emulsions exceeds 98.5% in long-term operation, with a stable demulsification speed exceeding 0.303 L/m2 min. When a superhydrophobic channel for separation is added, the oil/water separation efficiency exceeds 99.0%, and the final products are qualified oil and water. This attractive universal demulsification capability of PU/diatomite originates from its underliquid superamphiphobicity, which attracts a continuous phase to form a stable liquid film and thus repels dispersed phase droplets, which have a similar interaction with the surface but are much less abundant. The vacuum forces emulsion droplets into the microstructure of the PU/diatomite cake, where they are compressed, coalesce, and finally demulsified. This observed mechanism suggests a promising strategy to avoid the negative effects of oil fouling in demulsification and achieve large-scale universal continuous rapid demulsification.