Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 25, Issue 33, Pages 5368-5375Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201501066
Keywords
filter paper; hydrogel coatings; highly acidic; alkaline and salty; environment; oil-water separation
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Funding
- National Research Fund for Fundamental Key Projects [2011CB935700, 2010CB934700, 2009CB930404, 2007CB936403]
- National Natural Science Foundation [21121001, 91127025]
- Chinese Academy of Sciences [KJZD-EW-M01]
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The separation of oil-water mixtures in highly acidic, alkaline, and salty environment remains a great challenge. Simple, low-cost, efficient, eco-friendly, and easily scale-up processes for the fabrication of novel materials to effective oil-water separation in highly acidic, alkaline, and salty environment, are urgently desired. Here, a facile approach is reported for the fabrication of stable hydrogel-coated filter paper which not only can separate oil-water mixture in highly acidic, alkaline, and salty environment, but also separate surfactant-stabilized emulsion. The hydrogel-coated filter paper is fabricated by smartly crosslinking filter paper with hydrophilic polyvinyl alcohol through a simple aldol condensation reaction with glutaraldehyde as a crosslinker. The resultant multiple crosslinked networks enable the hydrogel-coated filter paper to tolerate high acid, alkali, and salt up to 8 m H2SO4, 10 m NaOH, and saturated NaCl. It is shown that the hydrogel-coated filter paper can separate oil-water mixtures in highly acidic, alkaline, and salty environment and oil-in-water emulsion environment, with high separation efficiency (>99%).
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