The zeolite Al-beta coating was fabricated on the stainless steel mesh by secondary growth method. Scanning electron microscopy (SEM)
X-ray diffraction (XRD) and contact angle (CA) measurements were used to characterize the zeolite Al-beta coatings. The cross-linked zeolite Al-beta crystals with spherical morphology on the stainless steel mesh constituted a micro/nanoscale hierarchical structure. The as-synthesized stainless steel mesh supported zeolite Al-beta coatings exhibited superhydrophilic and underwater superoleophobic characteristics. The stainless steel mesh supported zeolite Al-beta coating was applied to the separation of various oil/water mixtures. It could maintain the high separation efficiency above 97.1% after 100 separation cycles. The stability of zeolite Al-beta coatings was checked by using corrosive and ultrasonic treatments. The treated stainless steel mesh supported zeolite Al-beta coatings exhibited almost the same surface morphologies and separation efficiencies as the untreated sample. In addition
the zeolite Al-beta coating displayed a strong attachment to the stainless steel mesh surface. Self-cleaning stainless steel mesh supported zeolite Al-beta coatings with superior durability and stability would show great application potentials in actual oil/water separation processes.
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