Nguyen Thi Thuy Van, Tri Nguyen, Tran Boi An, Dao Duy Thanh, Nguyen Son Truong, Nguyen Tuan-Anh, Phan Anh N, Mai Thanh Phong, Huynh Ha Ky Phuong
Institute of Chemical Technology, Vietnam Academy of Science and Technology, No. 1A, TL29 Street, Thanh Loc Ward, District 12, Ho Chi Minh City 100000, Vietnam.
Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City 100000, Vietnam.
ACS Omega. 2021 Sep 28;6(40):26130-26139. doi: 10.1021/acsomega.1c03137. eCollection 2021 Oct 12.
Cellulosic aerogel from water hyacinth (WH) was synthesized to address the dual environmental issues of water hyacinth pollution and the production of a green material. Raw WH was treated with sodium hydroxide (NaOH) with microwave assistance and in combination with hydrogen peroxide (HO). The results from X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and scanning electron microscopy (SEM) showed that lignin and hemicellulose were markedly decreased after treatment, reducing from 24.02% hemicellulose and 5.67% lignin in raw WH to 8.32 and 1.92%, respectively. Cellulose aerogel from the pretreated WH had a high porosity of 98.8% with a density of 0.0162 g·cm and a low thermal conductivity of 0.030 W·m·K. After modification with methyl trimethoxysilane (MTMS) to produce a highly hydrophobic material, WH aerogel exhibited high stability for oil absorption at a capacity of 43.3, 43.15, 40.40, and 41.88 (g·g) with diesel oil (DO), motor oil (MO), and their mixture with water (DO + W and MO + W), respectively. The adsorption remained stable after 10 cycles.
为解决凤眼莲污染和绿色材料生产这两个环境问题，合成了来自凤眼莲（WH）的纤维素气凝胶。将未加工的凤眼莲在微波辅助下用氢氧化钠（NaOH）处理，并与过氧化氢（HO）结合使用。X射线衍射（XRD）、傅里叶变换红外（FT-IR）光谱和扫描电子显微镜（SEM）的结果表明，处理后木质素和半纤维素明显减少，未加工的凤眼莲中半纤维素从24.02%降至8.32%，木质素从5.67%降至1.92%。预处理后的凤眼莲制成的纤维素气凝胶孔隙率高达98.8%，密度为0.0162 g·cm，热导率低至0.030 W·m·K。用甲基三甲氧基硅烷（MTMS）改性以生产高疏水性材料后，凤眼莲气凝胶对柴油（DO）、机油（MO）及其与水的混合物（DO + W和MO + W）的吸油能力分别为43.3、43.15、40.40和41.88（g·g），表现出高稳定性。经过10次循环后，吸附仍保持稳定。
