Journal
CHEMICAL ENGINEERING JOURNAL
Volume 382, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.122925
Keywords
Self-repairing; Recyclable; Underwater superoleophobicity; Anti-freezing; APTES-SiO2/PVA organohydrogel; Oil/water separation
Categories
Funding
- Project of Science and Technology Innovation Team of Outstanding Young and Middle-aged Scientists, Department of Education of Hubei Province, China [T201801]
- State Key Laboratory of Separation Membranes and Membrane Processes (Tianjin Polytechnic University, China) [M2-201705]
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Hydrogel is attracting more and more interest in the field of oil-water separation because of its hydrophilicity and underwater oleophobicity. However, most traditional hydrogel composites have poor recycling performance, can not achieve self-repairing effect in the case of external mechanical damage, and inevitably freeze and at subzero temperatures because of a lot of water-soluble solvents in the gel network. These properties limit its application in the oil-water separation field. Therefore, it is still a challenge to prepare self-repairing and recyclable gel-based materials for oil/water separation in multiple environments. Here, superhydrophilic/underwater superoleophobic anti-freezing (3-aminopropyl) triethoxysilane-functionalized silica/polyvinyl alcohol (APTES-SiO2/PVA) organohydrogel and the related gel-coated mesh were successfully synthesized through a low-cost and simple process. The gel-coated mesh can separate oil-water mixtures in various water environments (including deionized water, HCl solution (1 M), NaOH solution (1 M), saturated NaCl solution, artificial seawater and saturated NaCl solution (-20 degrees C)) with a separation efficiency of above 99%. Impressively, they can achieve self-repairing and the recycling of raw materials through the excellent remoldability of organohydrogel (sol-gel transformation). The low-cost and easy fabrication, harsh-environment tolerance, self-repairing and recyclable features make the organohydrogel-based mesh promising toward oil/water separation under practical conditions.
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