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    Simply realizing durable PVDF/candle soot foam with excellent solar absorption for solar-assisted recovery of heavy oil spill

    Year: 2021

    Journal: J. Taiwan Inst. Chem. Eng., Volume 128, NOV, page 187–193

    Authors: Yue, Xuejie; Zhang, Ziqi; Zhang, Tao; Yang, Dongya; Xu, Jicheng; Qiu, Fengxian

    Keywords: Candle soot; sugar template; PVDF; photothermal; heavy oil cleanup; superhydrophobicity

    Background: The introduction of a photothermal layer on absorbent surface is a potential solution to produce heat for promoting the absorbent performance against viscous heavy oil, but the developed photothermal absorbent is still highly desirable but challenging, considering their complicated, tedious synthesis processes and susceptible surface to mechanical damage. Methods: A simple sugar-templating strategy was promoted to fabricate a porous PVDF/candle soot sponge using sugar as a sacrificial template. The encapsulated-candle soot can not only roughen the PVDF struts for superhydrophobicity but also endows the sponge with nearly full sunlight absorption (96.5%). Significant findings: Under sunlight exposure, the generated heat in situ reduced the viscosity of the sur-rounding heavy oil. Consequently, the sponge attains a remarkable oil absorbent rate of 82.5 g/g, reaching up to the state-of-the-art levels. Benefitting from high elasticity and mechanical robustness, the sponge main-tains more than 96% of its sorption capacity after 10 cycles. Moreover, the UV resistance and chemical dura-bility in a highly salty environment enable it to respond efficiently to heavy oil spills under complex marine conditions. Owing to its simple fabrication method and outstanding integrated properties, this composite sponge is of great potential for remediating heavy oil spill. (c) 2021 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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