Preparation of superhydrophobic-superoleophilic ZnO nanoflower@SiC composite ceramic membranes for water-in-oil emulsion separation
Preparation of superhydrophobic-superoleophilic ZnO nanoflower@SiC composite ceramic membranes for water-in-oil emulsion separation
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DOI：
10.1016/j.seppur.2022.121002
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发表时间：
2022-04-12
影响因子：
8.6
通讯作者：
Wei, Yibin
中科院分区：
文献类型：
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作者：
Wei, Jingjing;Nian, Pei;Wei, Yibin
超疏水-超亲油（SHB-SOL）润湿性已被证明在同时提高油包水（W/O）乳液分离的多孔界面材料的渗透性和选择性方面具有优越性。采用化学浴沉积法制备了ZnO纳米花（NF）改性SiC（ZnO NF@SiC）复合陶瓷膜。不同尺寸的ZnO纳米纤维生长在SiC颗粒上，在膜表面形成可调的微纳分级结构。经正辛基三乙氧基硅烷接枝后的复合陶瓷膜均表现出优异的SHB-SOL润湿性（水接触角> 150 °，滑动角SA < 10 °）。具有中等尺寸ZnO NF的ZnO NF@SiC膜显示出最高的SHB-SOL性能。当用于w/o乳液分离时，SHB-SOL ZnO NF@SiC膜与原始的和唯一的硅烷接枝的SiC膜相比显示出显著改善的油通量和水截留率。最佳膜对1000 ppm正己烷包水乳状液的截留率为-99%，在1 bar的跨膜压力下，初始油通量为-1300 L·m（-2）·h（-1），在已报道的疏水陶瓷膜中具有较强的竞争力。进一步揭示了表面分级结构、润湿行为和分离性能的机理。这一工作可能为制备用于实际w/o乳液分离的SHB-SOL陶瓷膜提供新的见解。
Superhydrophobic-superoleophilic (SHB-SOL) wettability has proved its superiority in simultaneously enhancing the permeability and selectivity of porous interfacial materials for water-in-oil (w/o) emulsion separation. Here, ZnO nanoflower (NF) modified SiC (ZnO NF@SiC) composite ceramic membranes are reported through a chemical bath deposition method. ZnO NFs with different sizes were grown onto SiC grains forming tunable micro-nano hierarchical structures on the membrane surfaces. After n-octyltriethoxysilane grafting, all the composite ceramic membranes exhibit outstanding SHB-SOL wettability (water contact angle > 150 degrees and sliding angle SA < 10 degrees). The ZnO NF@SiC membrane owning a middle-sized ZnO NF displays the highest SHB-SOL property. When used for w/o emulsion separation, the SHB-SOL ZnO NF@SiC membranes show significantly improved oil flux and water rejection compared with the pristine and the sole silane grafted SiC membranes. The water rejection of the optimal membrane for 1000 ppm water-in-hexane emulsion is -99% and the initial state oil flux is -1300 L.m(-2).h(-1) under a transmembrane pressure of 1 bar, which is relatively competitive among the reported hydrophobic ceramic membranes. The mechanisms of surface hierarchical structures, wetting behavior and separation performance are further revealed. This work may offer new insights into preparing SHB-SOL ceramic membranes for practical w/o emulsion separation.