Xu Xu, Li Xiang, Liu Guibin, Wei Xixi, Feng Daming, Zhang Lei
College of Chemistry, Liaoning University, Shenyang110036, P. R. China.
Inorg Chem. 2023 Feb 20;62(7):3260-3270. doi: 10.1021/acs.inorgchem.2c04322. Epub 2023 Feb 5.
In recent years, efficient oil-water separation has gradually become an indispensable part of environmental treatment. Superhydrophobic/superoleophilic materials with excellent self-cleaning performance are urgently required and remain challenging in the investigation of practical, rapid, and efficient separation of oil-water mixture and emulsion, especially those with robust surfaces that can be used in harsh conditions. In this work, a novel superhydrophobic/superoleophilic material was first fabricated by in situ constructing PDMS@ZIF-7/Cu(PO) hierarchical architectures on a copper mesh, which was adopted as a high flux and efficient separation material for gravity-driven separation of oil-water mixture as well as emulsion. The introduction of crucial Cu(PO) nanosheet interlayers created the ideal hierarchical structures and serve as partial templates for the subsequent in situ growth of hydrophobic ZIF-7 nanosheets. An improved superhydrophobicity (CA = 155°), permeation flux (102,000 L m h), and preferred self-cleaning property were thus achieved by such manipulation of the copper mesh. The PDMS@ZIF-7/Cu(PO) mesh exhibited exceptional separation efficiency for diverse oil-water mixtures and emulsions attributed to the superhydrophobicity and the demulsification ability and considerable stability to cope with extreme environments including sunlight resistance, low temperature, and corrosion resistance, which prompted its promising applicability in cleaning emulsified wastewater.
近年来，高效油水分离已逐渐成为环境治理中不可或缺的一部分。具有优异自清洁性能的超疏水/超亲油材料迫切需要，并且在实际、快速、高效地分离油水混合物和乳液的研究中仍然具有挑战性，特别是那些具有坚固表面可用于恶劣条件的材料。在这项工作中，首先通过在铜网上原位构建PDMS@ZIF-7/Cu(PO)分级结构制备了一种新型超疏水/超亲油材料，该材料被用作重力驱动分离油水混合物和乳液的高通量高效分离材料。关键的Cu(PO)纳米片中间层的引入创造了理想的分级结构，并作为后续疏水ZIF-7纳米片原位生长的部分模板。通过对铜网的这种处理，从而实现了改进的超疏水性（接触角CA = 155°）、渗透通量（102,000 L m⁻² h⁻¹）和优异的自清洁性能。PDMS@ZIF-7/Cu(PO)网对各种油水混合物和乳液表现出优异的分离效率，这归因于其超疏水性和破乳能力以及应对包括耐阳光、低温和耐腐蚀在内的极端环境的相当稳定性，这促使其在清洁乳化废水中具有广阔的应用前景。
