Abstract
Recently, superhydrophobic metal meshes for oily wastewater filtration have been widely reported. However, a facile and universal technique with easier operations to construct robustly superhydrophobic stainless steel (SS) mesh for dealing with oil-polluted water is still a challenge. Herein, a superhydrophobic SS mesh with stable polydopamine (PDA)-Cu nanoclusters (CNs) complexes was fabricated mainly on the basis of in situ growth approach. The as-prepared mesh is able to resist various organic solvents, corrosive solutions and strongly mechanical abrasion. It can be applied to purify water polluted by various types of oils with filtration efficiency as high as 96.6%. The separation efficiency (>97.2%) and water contact angle (>155.5°) remain very high even after 40 cycles of separation. Furthermore, the influence of the Cu2+ concentration on separation efficiency and oil permeation flux is also systematically investigated. This study gives a new technique to prepare durable and robustly superhydrophobic mesh for efficient and quick separation of the oils from water.
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