Two-dimensional membrane and three-dimensional bulk aerogel materials via top-down wood nanotechnology for multibehavioral and reusable oil/water separation
Two-dimensional membrane and three-dimensional bulk aerogel materials via top-down wood nanotechnology for multibehavioral and reusable oil/water separation
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通过自上而下的木材纳米技术的二维膜和三维散装气凝胶材料，用于多行为和可重复使用的油/水分离
DOI：
10.1016/j.cej.2019.04.108
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发表时间：
2019-09-01
影响因子：
15.1
通讯作者：
Li, Jianzhang
中科院分区：
文献类型：
--
作者：
Wang, Kaili;Liu, Xiaorong;Li, Jianzhang
传统的油水分离材料根据其分离行为可分为两类：过滤材料（如网、纺织品、膜等）和吸收材料（如海绵、泡沫、气凝胶等）。两种材料各有优缺点。将过滤和吸收功能结合到同一种材料中用于油/水分离应用是一个挑战。利用木材的高定向多孔结构和各向异性结构及其水响应特性，利用自上而下的木材纳米技术制备了具有水响应形状记忆功能、各向异性、鲁棒性和超疏水性的二维（2D）膜和三维（3D）体气凝胶材料，用于多行为（吸收和过滤）和可重复使用的油水分离。木材气凝胶是通过部分去除半纤维素和木质素得到的。此外，使用聚二甲基硅氧烷(PDMS)/固化剂体系对其进行超疏水处理。制备的木材气凝胶/PDMS块体材料具有高吸油能力（约20 g/g），并且由于其快速的水响应形状记忆功能而可以重复使用。所制备的木质气凝胶/PDMS膜材料仅靠重力驱动即可有效分离油水混合物，分离效率高达99.5%，通量约为2.25 × 10(4) L/m(2).h。自上而下的木材纳米技术成本低、简单、可扩展、绿色、高效，在多种行为的油水分离以及处理工业含油废水和溢油事故方面具有潜在的应用前景。
Traditional oil/water separation materials can be divided into two types on the basis of their separation behavior: filtration materials (e.g., meshes, textiles, membranes, etc.) and absorption materials (e.g., sponges, foams, and aerogels). Both types of materials have advantages and disadvantages. Combining the filtration and absorption functions into one and the same material for oil/water separation applications presents a challenge. Prompted by the highly oriented porous structures and anisotropic architectures of wood and its hygro-responsive characteristic, two-dimensional (2D) membrane and three-dimensional (3D) bulk aerogel materials with water-responsive shape memory function, anisotropy, robustness, and superhydrophobicity are prepared using top-down wood nanotechnology for multibehavioral (absorption and filtration) and reusable oil/water separation. Wood aerogel is obtained by partially removing hemicellulose and lignin. Further, it is super-hydrophobically treated using a polydimethylsiloxane (PDMS)/curing agent system. As-prepared wood aerogel/PDMS bulk materials possess high oil absorption capacity (about 20 g/g) and can be reused because of their fast water-responsive shape memory function. The prepared wood aerogel/PDMS membrane materials can efficiently separate oil/water mixtures with high separation efficiency (99.5%) and flux (around 2.25 x 10(4) L/m(2).h) by only the driving force of gravity. Top-down wood nanotechnology is low-cost, facile, scalable, green, and efficient, exhibiting potential for application in multibehavioral oil/water separation and ability to handle industrial oily wastewater and oil spillage accidents.