Journal
APPLIED SURFACE SCIENCE
Volume 416, Issue -, Pages 344-352Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.03.302
Keywords
Underwater superoleophobic; Layer-by-layer assembly; Halloysite nanotubes; Stainless steel mesh; Oil-water separation; Durability
Categories
Funding
- National Natural Science Foundation of China [21676102, 21376093, 21176091, 51476059]
- project of Guangzhou Science and Technology Plan [201607010172]
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A durable underwater superoleophobic mesh was conveniently prepared by layer-by-layer (LBL) assembly of poly (diallyldimethylammonium chloride) (PDDA) and halloysite nanotubes (HNTs) on a stainless steel mesh. The hierarchical structure and roughness of the PDDA/HNTs coating surface were controlled by adjusting the number of layer deposition cycles. When the PDDA/HNTs coating with 10 deposition cycles was decorated on the mesh with pore size of about 54 mu m, the underwater superoleophobic mesh was obtained. The as-prepared underwater superoleophobic PDDA/HNTs decorated mesh exhibits outstanding oil-water separation performance with a separation efficiency of over 97% for various oil/water mixtures, which allowed water to pass through while repelled oil completely. In addition, the as-prepared decorated mesh still maintained high separation efficiency above 97% after repeated 20 separation times for hexane/water mixture or chloroform/water mixture. More importantly, the as-prepared decorated mesh is durable enough to resist chemical and mechanical challenges, such as strong alkaline, salt aqueous and sand abrasion. Therefore, the as-prepared decorated mesh has practical utility in oil-water separation due to its stable oil-water performance, remarkable chemical and mechanical durability and the facile and eco-friendly preparation process. (C) 2017 Elsevier B.V. All rights reserved.
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