超疏水活性炭/聚氨酯复合泡沫的油水分离特性与循环稳定性研究OA

This study systematically investigated the influence of activated carbon(AC)content on the foaming behavior,microstructure,and oil-water separation performance of activated carbon/polyurethane composite foams.The results demonstrate that when the AC content exceeds 2 wt%,the in-situ reaction between AC and isocyanate promotes gela-tion while simultaneously adsorbing foaming gases,leading to a significant reduction in foaming rate and a linear increase in apparent density,which reaches 0.039 g/cm³.Microstructural analysis reveals that higher AC content(≥2 wt%)re-sults in reduced pore size and thickened pore walls,forming a favorable supporting structure that enhances the compres-sive strength of the composite by 40%(to 0.0245 MPa).The incorporation of AC increases surface roughness and de-creases surface energy,synergistically achieving superhydrophobic modification.As a result,the water contact angle in-creases from 73° to 122.8 °.At AC contents ranging from 2 wt%to 4 wt%,the composite exhibits an adsorption capaci-ty of 31.90 g/g for gasoline,representing a 30.7%increase compared to pure PUF.Although higher AC content(≥4 wt%)leads to reduced pore volume due to increased density,the material retains 96.26%of its initial adsorption capacity after 10 adsorption-desorption cycles.Notably,the composite shows exceptional cyclic stability for trichloro-methane,maintaining 98.8%of its original capacity.These findings demonstrate that composite foams with an opti-mized AC content offer promising potential for efficient and durable oil-water separation applications.