Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 400, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.123132
Keywords
Adhesion; Modified filter paper; Gravity separation; Surfactant-stabilized oil/water emulsion
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Funding
- National Natural Science Foundation of China [21875147, 51721091]
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Anti-adhesion is considered to be the basis for oil/water separation. However, this principle may not the superior choice for surfactant-stabilized oil/water emulsions owing to the inevitable adhesion of surfactant on the membrane, resulting in further adhesion of emulsified droplets and therefore attenuation in separation performance. Herein, we demonstrated a novel separation strategy for surfactant-stabilized oil/water emulsions by exploiting rather than preventing adhesion. A modified filter paper (mFP) with strong under-liquid adhesion to emulsified droplets was prepared, endowing it excellent separation performance for both surfactant-stabilized and surfactant free emulsions with very high separation efficiency (up to 99.9 %). Furthermore, the Random layer stacked scraps of mFP (RLS-mFP) were used to construct the separation device, which provided a labyrinthine but unobstructed flow path for emulsion because of the randomly stacked form and relatively large interspace among mFP scraps. The RLS-mFP has excellent separation performance with the separation flux for surfactant-stabilized oil-in-water and water-in-oil emulsions achieving 1035 and 3570 L m(-2) h(-1) respectively only under gravity. After 1-hour continuous separation, both flux and separation efficiency of RLS-mFP showed almost no decline comparing to initial flux for surfactant-stabilized emulsions. Meanwhile, the mFP could be easily recycled by rinsing and reused at least 50 times without sacrificing separation performance.
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