Abstract A novel PPS@ZIF-8 demulsifier was developed through grafting branched polyether polysiloxane (PPS) molecules onto the ZIF-8 crystal. This demulsifier presented a rough surface structure with interconnected pores, large surface area and high hydrophobicity. When processing the simulated alkaline-surfactant-polymer (ASP) flooding produced water that contained 0.4 g L−1 oil, the demulsifier exhibited an oil removal rate of 90.03%, much higher than that of PPS (65.66%) and ZIF-8 (55.43%). The excellent oil removal rate was ascribed to its abilities to destabilize and coalesce the emulsified fine-sized oil droplets, including the demulsification of PPS and the adsorption of ZIF-8. An adsorption kinetics and isotherm study manifested that oil drops uptake onto ZIF-8 exhibited homogeneous and monolayer adsorption. A maximum adsorption capacity of 1753 mg g−1 was achieved due to the electrostatic and hydrophobic interaction between ZIF-8 and oil. The PPS@ZIF-8 demulsifier with unique oil adsorption properties offers great potential for oily wastewater treatment.

中文翻译：

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聚醚聚硅氧烷接枝ZIF-8吸附去除三元复合驱采出水中油滴

摘要 通过将支链聚醚聚硅氧烷（PPS）分子接枝到 ZIF-8 晶体上，开发了一种新型 PPS@ZIF-8 破乳剂。这种破乳剂具有粗糙的表面结构，具有相互连接的孔隙、大表面积和高疏水性。在处理含0.4 g L-1油的模拟碱性表面活性剂聚合物（ASP）驱采出水时，破乳剂的除油率为90.03%，远高于PPS（65.66%）和ZIF-8（ 55.43%）。优异的除油率归因于其破坏和聚结乳化细小油滴的能力，包括 PPS 的破乳和 ZIF-8 的吸附。吸附动力学和等温线研究表明，油滴在 ZIF-8 上的吸收表现出均匀的单层吸附。由于 ZIF-8 和油之间的静电和疏水相互作用，实现了 1753 mg g-1 的最大吸附容量。具有独特吸油性能的 PPS@ZIF-8 破乳剂为含油废水处理提供了巨大的潜力。