Currently, with the increasingly serious pollution problem of oily wastewater, it is urgent to develop advanced materials and methods. In this work, a Fe(III)-CMC@Ni(OH)₂@Ni composite foam with superhydrophilic and underwater superoleophobicity was fabricated by an in situ growth of flower-like Ni(OH)₂ nanoparticles and chelated assembly of Fe(III)-CMC nanohydrogel via a layer-by-layer self assembly using Fe3+ ion and carboxymethyl cellulose (CMC). The composite foam could separate various oil/water mixtures and exhibited excellent efficiency over 99%. This foam possessed ultrahigh water flux (220000L m−2 h−1) and better resistant to penetration pressure (1.3kPa). After 30 cycles, the oil–water separation performance reduced only 0.5%, but the foam structure was still stable that guarantees a better lifetime. Besides, this composite foam showed anti-fouling, unique durability and excellent corrosion resistance performance. Taking into account all good properties, Fe(III)-CMC@Ni(OH)₂@Ni composite foam was expected to be a potential candidate for responding to all kinds of complex oily wastewater conditions.

中文翻译：

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纤维素纳米水凝胶螯合组装到具有水下超疏油性的花状结构泡沫上，实现高效油水分离

当前，随着含油废水污染问题的日益严重，迫切需要开发先进的材料和方法。在这项工作中，一种具有超亲水和水下超疏油性的 Fe(III)-CMC@Ni(OH) ₂ @Ni 复合泡沫由原位花状 Ni(OH) ₂纳米粒子的生长和 Fe(III)-CMC 纳米水凝胶的螯合组装通过逐层自组装使用铁3+离子和羧甲基纤维素（CMC）。复合泡沫可以分离各种油/水混合物，并表现出超过99%的优异效率。这种泡沫具有超高的水通量（220000大号米-2 H-1)并且更好地抵抗穿透压力（1.3千帕）。30次循环后，油水分离性能仅降低0.5%，但泡沫结构仍然稳定，保证了更长的使用寿命。此外，这种复合泡沫还具有防污、独特的耐久性和优异的耐腐蚀性能。考虑到所有良好的性能，Fe(III)-CMC@Ni(OH) ₂ @Ni 复合泡沫有望成为应对各种复杂含油废水条件的潜在候选者。