Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 14, Pages 16859-16868Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c21852
Keywords
absorption; oil/water separation; hierarchically porous materials; trade-off correlation; water intrusion pressure
Funding
- Natural Resources Canada (NRCan) within The Oil Spill Response Science Program [OSRS2-011]
- Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [QA201814]
- Integrated Quantitative Biology Initiative, Canada Foundation for Innovation project, McGill University [33122]
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By utilizing hierarchically porous polypropylene instead of increasing pumping pressure or enlarging primary pores, the oil removal throughput can be significantly enhanced without compromising oil/water separation selectivity.
Recently, various porous absorbents have been developed and the in situ vacuum/pump-assisted continuous separation process has proven to be the most efficient technique to utilize those absorbents for oil spill cleanup. However, to achieve a high oil removal throughput, a high pumping pressure and/or large absorbent pore sizes are required, which would compromise the selectivity of oil/water separation, as water may penetrate the absorbent beyond a critical external pressure. In this work, this challenge has been circumvented by employing hierarchically porous polypropylene (PP) with controlled pore sizes generated from a tricontinuous heterophase polymer blend system. As compared to unimodal pores, the incorporation of the secondary smaller pores significantly enhances the oil removal throughput by up to 4-5 times without the necessity of raising the pumping pressure or increasing the diameter of the primary pores, which in turn, prevents compromising the oil/water separation selectivity.
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