Abstract In this work, a novel composite sorbent material for water remediation from oily contaminants, based on a cellulose three-dimensional fibrous scaffold treated with stearic acid and expanded graphite flakes, is presented. The pristine cellulose foams are inherently omniphilic, absorbing indiscriminately both water and oils. However, after being modified with stearic acid and graphite via drop casting, they become superhydrophobic (still preserving their superoleophilic characteristics). As a result, the foams start exhibiting a highly selective behaviour which permits to absorb different kinds of oils and organic solvents, while repelling water completely. Thermal and chemical characterizations reveal that the modification treatment is successfully performed, while the performed mechanical tests demonstrate a good recovery of elasticity after repeated deformations and confirm that the elasticity of the foam is preserved after the treatment. Although based on natural materials, the fabricated foams exhibit oil absorption rate, saturation time and capacity values comparable to those of some synthetic materials with the same aim, exhibiting a very important added value, as it is based on low cost, green and biodegradable materials, requiring, at the same time, low processing costs and providing excellent reusability properties.

中文翻译：

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一种用于水修复油性污染物的生物基复合材料

摘要 在这项工作中，基于用硬脂酸和膨胀石墨薄片处理的纤维素三维纤维支架，提出了一种用于油性污染物水修复的新型复合吸附剂材料。原始的纤维素泡沫本质上是全亲性的，不分青红皂白地吸收水和油。然而，在通过滴铸用硬脂酸和石墨改性后，它们变得超疏水（仍然保持其超亲油特性）。因此，泡沫开始表现出高度选择性的行为，允许吸收不同种类的油和有机溶剂，同时完全排斥水。热和化学表征表明改性处理成功进行，而进行的机械测试表明，在反复变形后弹性恢复良好，并确认泡沫在处理后保持弹性。虽然基于天然材料，但制造的泡沫表现出的吸油率、饱和时间和容量值可与一些具有相同目标的合成材料相媲美，表现出非常重要的附加值，因为它基于低成本、绿色和可生物降解的材料，同时要求低加工成本并提供出色的可重用性。