Graduate School of Science and Technology, Hirosaki University, 1-Bunkyocho, Hirosaki 036-8560, Japan.
Department of Chemical Technology, Chulalongkorn University, Bangkok 10330, Thailand.
Carbohydr Polym. 2018 Jun 15;190:184-189. doi: 10.1016/j.carbpol.2018.02.066. Epub 2018 Feb 22.
Nanocellulose sponge was fabricated by a facile method: freeze-drying of nanocellulose aqueous suspension to sponge state, following by hydrophobic treatment with stearoyl chloride at 50 °C for 1 h. The obtained nanocellulose sponge showed superhydrophobicity (160° of water contact angle) and superoleophilicity with high protection from water but selective absorption of oil. Its absorption capacities for various kinds of oil and non-polar liquids were 25-55 times higher than its dry weight and exhibited excellent selectivity for absorbing of oil which spilled on the surface of water or underwater with high separation efficiency. This superhydrophobic nanocellulose sponge can be easily recovered by simple squeezing and reused at least 10 cycles with remained high separation efficiency. It is expected that such a biodegradable nanocellulose sponge can be applied to solve the oil spill accident and treat the oily wastewater from households and industries.
将纳米纤维素水悬浮液冷冻干燥成海绵状，然后在 50°C 下用硬脂酰氯进行疏水处理 1 小时。所得纳米纤维素海绵表现出超疏水性（水接触角为 160°）和超亲油性，对水具有高保护作用，但对油具有选择性吸收。它对各种油和非极性液体的吸收能力是其干重的 25-55 倍，对水面或水下溢油具有优异的选择性，分离效率高。这种超疏水纳米纤维素海绵可以通过简单挤压轻松回收，至少可重复使用 10 次，且分离效率保持较高。预计这种可生物降解的纳米纤维素海绵可用于解决溢油事故，并处理来自家庭和工业的含油废水。
