Journal
NATURE NANOTECHNOLOGY
Volume 12, Issue 5, Pages 434-440Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NNANO.2017.33
Keywords
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Funding
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [21521001]
- National Natural Science Foundation of China [21431006, 21761132008, 11525211]
- Key Research Program of Frontier Sciences, CAS [QYZDJ-SSW-SLH036]
- Chinese Academy of Sciences [KFJ-EW-116, KJZD-EW-M01-1]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB22040402]
- Ministry of Science and Technology of China [2014CB931800]
- Users with Excellence and Scientific Research Grant of Hefei Science Center of CAS [2015HSC-UE007]
- Fundamental Research Funds for the Central Universities [WK6030000018]
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The clean-up of viscous crude-oil spills is a global challenge. Hydrophobic and oleophilic oil sorbents have been demonstrated as promising candidates for oil-spill remediation. However, the sorption speeds of these oil sorbents for viscous crude oil are rather limited. Herein we report a Joule-heated graphene-wrapped sponge (GWS) to clean-up viscous crude oil at a high sorption speed. The Joule heat of the GWS reduced in situ the viscosity of the crude oil, which prominently increased the oil-diffusion coefficient in the pores of the GWS and thus speeded up the oil-sorption rate. The oil-sorption time was reduced by 94.6% compared with that of non-heated GWS. Besides, the oil-recovery speed was increased because of the viscosity decrease of crude oil. This in situ Joule self-heated sorbent design will promote the practical application of hydrophobic and oleophilic oil sorbents in the clean-up of viscous crude-oil spills.
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