Nanocellulose nanocomposite aerogel towards efficient oil and organic solvent adsorption
Nanocellulose nanocomposite aerogel towards efficient oil and organic solvent adsorption
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DOI：
10.1007/s42114-021-00289-y
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发表时间：
2021-06-29
影响因子：
20.1
通讯作者：
Guo, Zhanhu
中科院分区：
文献类型：
--
作者：
Gu, Hongbo;Gao, Chong;Guo, Zhanhu
为了改善纳米纤维(NC)气凝胶的疏水性和吸附性能，将纳米壳聚糖(NCS)和氧化石墨烯(RGO)引入纳米气凝胶中，采用水热结合冷冻干燥的方法制备了NC/NCS/RGO复合气凝胶。研究了制备具有良好多孔结构和良好吸附性能的纳米复合气凝胶的最佳工艺条件，包括NC和NCS质量分数的影响。结果表明，在0.1wt%NCS和0.05wt%NC条件下制备的纳米复合气凝胶具有很低的密度为9.3mgcm(-3)，疏水性强，水接触角大(115.26度)，高吸附容量分别为171.85+/-3.02,159.64+/-1.83,153.22+/-2.92,149.60+/-6.26,139.93+/-3.69,132.47+/-3.45，对矿物油、芝麻油、丙酮、乙酸乙酯、噻吩类、泵油、废泵油、煤油和乙醇分别为176.82+/-4.66、128.70+/-0.69和120.34+/-5.57g(-1)。此外，这种气凝胶吸附剂可以高效、连续地去除/收集经过设计的油/水泵装置确认的废水中的油。因此，该纳米复合气凝胶在石油和有机溶剂吸附方面具有潜在的应用前景。
In this work, in order to ameliorate the hydrophobic property and adsorption capacity of nanocellulose (NC) aerogel, the nanochitosan (NCS) and reduced graphene oxide (rGO) have been introduced into the NC aerogel to construct the NC/NCS/rGO nanocomposite aerogel by a hydrothermal method combined with freeze-drying method. The optimal conditions including the effect of NC and NCS weight percentages for preparation of NC/NCS/rGO nanocomposite aerogel with good porous microstructures and excellent adsorption capacities have been evaluated. The results demonstrate that the NC/NCS/rGO nanocomposite aerogel produced under the fabrication condition of 0.1 wt% NCS and 0.05 wt% NC exhibits a very low density of 9.3 mg cm(-3), a high hydrophobicity with a large water contact angle (115.26 degrees) and the high adsorption capacities of 171.85 +/- 3.02, 159.64 +/- 1.83, 153.22 +/- 2.92, 149.60 +/- 6.26, 139.93 +/- 3.69, 132.47 +/- 3.45, 176.82 +/- 4.66, 128.70 +/- 0.69, and 120.34 +/- 5.57 g g(-1) to mineral oil, sesame oil, acetone, ethyl acetate, thiophene, pump oil, waste pump oil, kerosene, and ethyl alcohol, respectively. In addition, this aerogel adsorbent could efficiently and continuously remove/collect the oil from wastewater confirmed by a designed oil/water pump apparatus. As a consequence, this NC/NCS/rGO nanocomposite aerogel has a potential application in the oil and organic solvent adsorption.