Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao 266000, PR China.
School of Environment, State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing 100084, China.
Sci Total Environ. 2019 Dec 1;694:133671. doi: 10.1016/j.scitotenv.2019.133671. Epub 2019 Jul 31.
In this paper, a facile approach was developed for highly effective oil/water separation by incorporating of the dimethyldiallylammonium chloride acrylamide polymer (P(AM-DMDAAC)) into graphene aerogels. The functionalized 3D graphene aerogel integrated a series of excellent physical properties, including low density (11.4 mg/cm), large specific surface area (206.591 m/g), and great hydrophobicity (contact angle of 142.7°). The modified aerogel showed excellent adsorption capacity for oils and organic solvents (up to 130 g/g). The saturation can be reached in a short time and the adsorption capacity remained nearly unchanged after repeated heating cycles. Meanwhile, we found a simple method to achieve controlled wettability transition of P(AM-DMDAAC)/graphene aerogels (PGAs) by changing the pH values. The hydrophobic PGA prepared at pH 2.03 showed outstanding oil/water separation performance (130 g/g). As the pH increased, the oil adsorption capabilities of PGAs decreased slightly, but the adsorption performance for the hydrophilic organic dye was significantly improved. Therefore, as a recyclable and efficient water purification material, the sustainable and environment-friendly polymer-modified graphene aerogel has great application potential.
本文提出了一种简便的方法，通过将二甲基二烯丙基氯化铵丙烯酰胺聚合物（P(AM-DMDAAC)）掺入石墨烯气凝胶中，实现高效的油水分离。功能化的 3D 石墨烯气凝胶集成了一系列优异的物理性能，包括低密度（11.4mg/cm）、大比表面积（206.591m/g）和高疏水性（接触角为 142.7°）。改性气凝胶对油和有机溶剂具有优异的吸附能力（高达 130g/g）。可以在短时间内达到饱和状态，并且在重复加热循环后吸附能力几乎保持不变。同时，我们发现了一种通过改变 pH 值来实现 P(AM-DMDAAC)/石墨烯气凝胶（PGAs）可控润湿性转变的简单方法。在 pH 2.03 下制备的疏水性 PGA 表现出优异的油水分离性能（130g/g）。随着 pH 值的增加，PGAs 的吸油能力略有下降，但对亲水性有机染料的吸附性能显著提高。因此，作为一种可回收和高效的水净化材料，这种可持续和环保的聚合物改性石墨烯气凝胶具有巨大的应用潜力。
