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| Preparation of Hydrophobic Lignocellulose Aerogels for Oil-water Separation |
| Received:May 12, 2023 |
| DOI：10.11980/j.issn.0254-508X.2023.09.002 |
| Key Words:lignocellulose aerogel liquid phase reaction hydrophobic modification oil-water separation |
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| Abstract:In this study， the hydrophobic modification of soybean straw aerogels was carried out in methylene chloride using benzoyl chloride and fatty chlorides with different carbon chain lengths （acetyl chloride， octanoyl chloride， and stearoyl chloride） as esterifying agents， and pyridine as the catalyst. The hydroxyl substitution （DS）， porous structure， compressive strength， water contact angle （CA）， oil-water separation performance， and recycling properties of the aerogels were investigated. The results showed that the porosity of the aerogel decreased after hydrophobic esterification， resulting in a slight decrease in its oil absorption multiplicity， but the compressive strength and CA increased significantly. The DS value of acetyl chloride-modified aerogel was higher （1.07）， but the hydrophobic effect was not good. The steric effect and conjugated effect made the DS value of benzoyl chloride-modified aerogel lower （0.58）， and the CA value was only 91°， but the compressive strength was significantly increased to 855 kPa. The DS values of octanoyl chloride- and stearoyl chloride-modified aerogels were 0.88 and 0.64， respectively， and the CA values were 123° and 144°， with good oil-water separation performance and recyclability. |
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