Biodegradable polymer foams with excellent oil-water separation performance show significant advantages in the treatment of oily wastewater and oil spill cleanup. Herein, high-expansion poly(l-lactic acid) (PLLA)/poly(d-lactic acid) (PDLA) foams with microcellular open-cell structure were successfully fabricated by an eco-friendly supercritical CO₂ foaming method. When the PDLA content was 2.5 wt% (D2.5), mesh-like structures which made cells connected appeared on cell walls due to the existence of stereocomplex crystals. The D2.5 foam prepared at 10 MPa and 115 °C had an expansion ratio of 41 and cell size of 48 µm. The adsorption capacity was 12–45 g/g for oil/organic solvents and almost 0 g/g for water, which indicated that it could effectively separate oil from water. In addition, the adsorption capacity maintained around 84 % after 10 adsorption-desorption cycles. Moreover, the D2.5 foam exhibited a better heat resistance compared with PLLA foam. This work provides a strategy for preparing fully bio-based and biodegradable foams applied to oil-water separation.

具有优异油水分离性能的可生物降解聚合物泡沫在含油废水处理和溢油清理方面具有显着优势。在此，采用环保超临界CO ₂成功制备了具有微孔开孔结构的高膨胀聚（l-乳酸）（PLLA）/聚（d-乳酸）（PDLA）泡沫。发泡法。当PDLA含量为2.5 wt%（D2.5）时，由于立体络合物晶体的存在，细胞壁上出现了使细胞相互连接的网状结构。在 10 MPa 和 115 °C 下制备的 D2.5 泡沫的膨胀比为 41，泡孔尺寸为 48 µm。对油/有机溶剂的吸附能力为12-45 g/g，对水的吸附能力几乎为0 g/g，这表明它可以有效地分离油水。此外，吸附容量在 10 个吸附-解吸循环后保持在 84% 左右。此外，与 PLLA 泡沫相比，D2.5 泡沫表现出更好的耐热性。这项工作为制备应用于油水分离的完全生物基和可生物降解的泡沫提供了一种策略。