Fabrication of stainless steel mesh supported zeolite Al-beta coatings for oil/water separation

doi:10.11949/0438-1157.20190355

Abstract

Abstract:

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.

Key words: film, surface, stainless steel mesh, zeolite Al-beta, superhydrophilic, underwater superhydrophobic, oil/water separation, stability

摘要：

使用二次生长法在不锈钢网表面制备了Al-beta分子筛涂层，并通过扫描电镜、X射线衍射和接触角检测对其进行了表征。Al-beta分子筛晶粒以球形呈现在不锈钢网表面，并相互交联而构成微纳双级粗糙结构，Al-beta涂层表现出超亲水和水中超疏油性质。将不锈钢网负载Al-beta分子筛涂层用于分离一系列油水混合物，并考察了其耐久性和稳定性。实验结果表明，不锈钢网负载Al-beta分子筛涂层在重复使用100次后其正己烷/水分离效率仍保持在97.1%以上，酸、碱和超声等处理对其形貌和油水分离效率几乎没有影响，具备优异的耐久性、自清洁性和稳定性，在实际油水分离过程中有很大应用潜力。

关键词: 膜, 表面, 不锈钢网, Al-beta沸石, 超亲水, 水中超疏油, 油水分离, 稳定性

CLC Number:

TQ 028.8

Xizi SHANG, Baoquan ZHANG, Yun LI. Fabrication of stainless steel mesh supported zeolite Al-beta coatings for oil/water separation[J]. CIESC Journal, 2019, 70(10): 3994-4001.

尚茜子, 张宝泉, 李雲. 不锈钢网负载Al-beta分子筛涂层的制备及其在油水分离中的应用[J]. 化工学报, 2019, 70(10): 3994-4001.

Figures/Tables 10

Fig.1 SEM images of bare stainless steel mesh and its supported zeolite Al-beta coating

Fig.2 XRD patterns of bare stainless steel mesh and its supported zeolite Al-beta coating

Fig.3 Surface wettability of bare stainless steel mesh and its supported zeolite Al-beta coating

Fig.4 Oil/water separation process

Fig.5 Separation efficiencies of stainless steel mesh supported zeolite Al-beta coating for various oil/water mixtures

Fig.6 Separation efficiencies of stainless steel mesh supported zeolite Al-beta coating vs recycling numbers

Fig.7 Separation efficiencies of stainless steel mesh supported zeolite Al-beta coatings before and after being immersed in corrosive media

Fig. 8 SEM images of stainless steel mesh supported zeolite Al-beta coatings after immersion in corrosive media

Fig.9 Dependence of separation efficiencies of stainless steel mesh supported zeolite Al-beta coating on ultrasonic time

Fig.10 SEM images of stainless steel mesh supported zeolite Al-beta coating after ultrasonication treatment

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