Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 694, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.133671
Keywords
Graphene aerogel; Dimethyldiallylammonium chloride acrylamide polymer; Oil/water separation; Adsorption
Categories
Funding
- Major technological innovation engineering project of Shandong Province [2018CXGC1010]
- Tai Shan Scholar Foundation [ts201511003]
- Key Research and Development Projects in Shandong Province [2017GSF17109]
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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(3)), large specific surface area (206.591 m(2)/g), and great hydrophobicity (contact angle of 142.7 degrees). 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. (C) 2019 Published by Elsevier B.V.
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