Oil–inorganic material interactions at the oil/water interface have been extensively investigated as a fundamental research area. However, less focus has been placed on the oil/water interfacial process during the oily waste treatment process. In this study, the detailed oil/water interfacial destabilization process of a floated oily sludge (FOS) solution during Fenton-like treatment is investigated. A maximum of 66.1% of oil recovery was obtained from the FOS samples after the treatment. The influence of experimental conditions such as pH, hydrogen peroxide concentration, and reaction time on the oil percentage of sediments after treatment is also studied. The reduction of oil percentage in the FOS reached 77.5%, which indicated the high efficiency of the treatment. Rheological experiments showed that the bridge between the oil and coagulant mixtures in the FOS was destroyed after the addition of H₂O₂. Half of the H₂O₂ (a total of 50 mM) was consumed, though nearly no free Fe²⁺ could be detected in the FOS solution at a neutral pH. Electron paramagnetic resonance experiments demonstrated an enhanced generation of ·OH that occurred due to the catalytic decomposition of H₂O₂ by interfacial-active complexes (IAC). The interfacial destabilization process was triggered using a direct reaction of H₂O₂ and iron-containing components in the IAC, as well as ·OH induced oxidation of the sulfur-containing components in the IAC at the oil/water interface. This research may provide a better understanding of oil–inorganic interactions at the oil/water interface during oily waste treatment and provide insight for the development of future processing strategies for oil recovery from oily sludge.

中文翻译：

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基于界面活性复合物催化分解H ₂ O ₂的浮油状污泥油/水界面失稳

油/水界面处的油-无机材料相互作用已被广泛研究为基础研究领域。但是，在含油废物处理过程中，油/水界面过程的关注较少。在这项研究中，详细研究了Fenton类处理过程中浮油污泥（FOS）溶液的油/水界面失稳过程。处理后，从FOS样品中最多可回收66.1％的油。还研究了pH，过氧化氢浓度和反应时间等实验条件对处理后沉积物含油率的影响。FOS中的含油率降低了77.5％，表明该处理效率很高。₂ O ₂。尽管在中性pH值的FOS溶液中几乎检测不到游离的Fe ²⁺，但消耗了一半的H ₂ O ₂（总计50 mM）。电子顺磁共振实验表明，由于界面活性复合物（IAC）对H ₂ O ₂的催化分解，使·OH的生成增加。H ₂ O ₂的直接反应引发了界面失稳过程IAC中的含铁成分以及油/水界面处的·OH诱导IAC中的含硫成分的氧化。这项研究可以更好地了解含油废物处理过程中油/水界面处的油-无机相互作用，并为开发用于从含油污泥中回收油的未来处理策略提供见识。