Low-Density, Mechanical Compressible, Water-Induced Self-Recoverable Graphene Aerogels for Water Treatment
Low-Density, Mechanical Compressible, Water-Induced Self-Recoverable Graphene Aerogels for Water Treatment
复制标题
用于水处理的低密度、机械可压缩、水诱导自恢复石墨烯气凝胶
DOI：
10.1021/acsami.7b04536
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发表时间：
2017
影响因子：
9.5
通讯作者：
Feng Jiachun
中科院分区：
文献类型：
--
作者：
Ye Shibing;Liu Yue;Feng Jiachun
石墨烯气凝胶（GAs）由于其高孔隙率、大表面积和高疏水性而在水处理中表现出巨大的前景，作为分离和吸附材料。在这项工作中，我们已经制作了一系列新的可压缩的，轻量级的（3.3毫克cm-3）通过简单的交联氧化石墨烯（GO）和聚乙烯醇（PVA）与戊二醛的气体。结果发现，交联的GAs（xGAs）显示出一个有趣的水诱导的自恢复能力，即使在极高的压缩应变或真空/空气干燥后，它可以恢复到原来的体积。重要的是，xGAs的两亲性可以通过改变GO和PVA的投料比来容易地调节，并且其表现出从极性水到非极性有机液体的亲和性取决于其两亲性。低PVA/GO投料比的疏水性xGAs可以作为有机液体的吸附剂，而高PVA/GO投料比的亲水性xGAs可以作为过滤材料去除废水中的部分水溶性染料。由于我们的方法可以通过简单地改变PVA/GO比例来调节两亲性，并且所得xGAs具有优异的性能，例如低密度，压缩和水诱导自恢复，因此这项工作提出了一种有前途的技术来制备用于不同环境中的水处理的气体基材料，具有高可回收性和长寿命。
Graphene aerogels (GAs) have demonstrated great promise in water treatment, acting as separation and sorbent materials, because of their high porosity, large surface area, and high hydrophobicity. In this work, we have fabricated a new series of compressible, lightweight (3.3 mg cm–3) GAs through simple cross-linking of graphene oxide (GO) and poly(vinyl alcohol) (PVA) with glutaraldehyde. It is found that the cross-linked GAs (xGAs) show an interesting water-induced self-recovery ability, which can recover to their original volume even under extremely high compression strain or after vacuum-/air drying. Importantly, the amphiphilicity of xGAs can be adjusted facilely by changing the feeding ratio of GO and PVA and it exhibits affinity from polar water to nonpolar organic liquids depended on its amphiphilicity. The hydrophobic xGAs with low feeding ratio of PVA and GO can be used as adsorbent for organic liquid, while the hydrophilic xGAs with high feeding ratio of PVA and GO can be used as the filter material to remove some water-soluble dye in the wastewater. Because of the convenience of our approach in adjusting the amphiphilicity by simply changing the PVA/GO ratio and excellent properties of the resulting xGAs, such as low density, compressive, and water-induced self-recovery, this work suggests a promising technique to prepare GAs-based materials for the water treatment in different environment with high recyclability and long life.