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| 疏水亲油型纳米纤维素气凝胶的制备与吸油性能研究 |
| Preparation and Oil Absorption Properties of Hydrophobic and Oil-philic Nanocellulose Aerogel |
| 收稿日期：2022-02-06 |
| DOI：10.11980/j.issn.0254-508X.2023.02.002 |
| 关键词: 纳米纤维素 气凝胶 硬脂酰氯 疏水性 吸油性 循环使用性 |
| Key Words:nanocellulose aerogel stearoyl chloride hydrophobic oil absorption recyclability |
| 基金项目:浙江省“尖兵”“领雁”研发攻关计划项目（2023C01195）；衢州市科技计划项目（2021K48）。 |
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| 摘要:本研究以不同方法制备的针叶木纳米纤维素（CNF、ECNF和TCNF）为原料，通过冷冻干燥法制备纳米纤维素气凝胶，并利用硬脂酰氯（SAC）溶液浸渍法对其进行疏水改性。采用激光粒度仪、X射线衍射分析仪、Zeta电位仪测定了纳米纤维素的粒径分布、结晶度及电荷密度，并对疏水改性前后气凝胶的密度、孔隙率、结构形貌、疏水性能及吸油性能进行了分析和研究。结果表明，TCNF粒径及电荷分布较为均匀；SAC改性不会影响纳米纤维素气凝胶轻质、多孔的特性，改性后的气凝胶表现出优异的疏水性和良好的吸油性，其中S-ECNFA的疏水性最佳，表面水接触角（CA）可达151.6°；S-TCNFA对4种不同密度的油吸附能力最强，其中对食用油的吸油量可达48.96 g/g气凝胶，经5次循环使用后，对食用油的吸油量仍可达初次吸油量的60.8%，具有较好的循环使用性能。 |
| Abstract:Nanocellulose （CNF， ECNF， and TCNF） prepared from softwood via different methods were used as the raw materials in this study. The aerogels were prepared by freeze drying and modified by impregnating with stearoyl chloride （SAC） solution. The results showed that particle size and charge distribution of TCNF were more uniform. The SAC modification had not changed the characteristics of lightweight and porous with porosity of 99.4%. The modified nanocellulose aerogels showed excellent hydrophobicity and great oil absorption ability. The S-ECNFA aerogel hydrophobic modified by SAC had the best hydrophobicity with the contact angle of 151.6°. S-TCNFA had the greatest oil absorption capacity with the edible oil adsorption capacity of 48.96 g/g aerogel， and had good recyclability. After 5 times reused， the adsorption capacity towards edible oil of S-TCNFA could still reach 60.8% of the initial adsorption capacity. |
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