期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 668, 期 -, 页码 153-160出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2019.02.407
关键词
Hydrogel; Graphene oxide; Silica aerogel; Solar evaporation; Air-water interface
资金
- National Key Research and Development Program of China [2016YFD0400203]
- National Natural Science Foundation of China [31771914, 21204007]
- Natural Science Foundation of Liaoning Province of China [20170540076, 20170540079]
- Research on Science and Technology of Education Department of Liaoning Province project [2017J078]
This paper reports a facile approach to synthesize a novel composite hydrogel with graphene oxide (GO), silica aerogel (SA), acrylamide (AM), and poly( vinyl alcohol) (PVA) through physical and chemical aoss-linking method. The composite hydrogel (GO/SA PAM-PVA hydrogel) exhibits excellent solar evaporation property, good water transmission capacity, and floatability. The GO nanosheets dispersed homogeneously in the hydrogel could provide prominent photothermal conversion efficiency to heat water for evaporation. Excellent hydrophilicity of hydrogel promotes the water molecules transport from the bottom to the top of the hydrogel, which can increase evaporation efficiency. The SA in the hydrogel makes the GO/SA PAM-PVA hydrogel floatable, which is crucial for improving evaporation efficiency because evaporation occurs primarily at several molecular layers on the surface of the water. Furthermore, the self-cleaning ability derived from SA of the GO/SA PAM-PVA hydrogel surface provides a convenient recycling and reusing process for practical applications. The evaporation mass of seawater achieved by the GO/SA PAM-PVA hydrogel is 6 times higher than that of traditional process at an optical density of 2 kW m(-2) for 30 min. Meanwhile, the evaporation efficiency of GO/SA PAM-PVA hydrogel remains good during reuse. (C) 2019 Elsevier B.V. All rights reserved.
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