A facile approach to ultralight and recyclable 3D self-assembled copolymer/graphene aerogels for efficient oil/water separation.

Affiliation

School of Environment, State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing 100084, China. Electronic address: [Email]

Abstract

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/cm3), large specific surface area (206.591 m2/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.

Keywords

Adsorption,Dimethyldiallylammonium chloride acrylamide polymer,Graphene aerogel,Oil/water separation,

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