期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 55, 期 20, 页码 14156-14164出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.1c04443
关键词
membrane distillation; desalination; wetting; fouling; surface modification; hydrophilic coating; capillary pressure
资金
- Program for Guangdong Introduction of Innovative and Entrepreneurial Teams [2019ZT08L213]
- US National Science Foundation [1903685]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1903685] Funding Source: National Science Foundation
A simple and scalable method for fabricating Janus MD membrane with wetting and fouling resistance has been reported, along with the mechanism of wetting resistance. Experimental results show that the dense Janus membrane can resist wetting and fouling simultaneously, providing important insight for the preparation and application of MD membranes.
Although membrane distillation (MD) has been identified as a promising technology to treat hypersaline wastewaters, its practical applications face two prominent challenges: membrane wetting and fouling. Herein, we report a facile and scalable approach for fabricating a Janus MD membrane comprising a dense polyvinyl alcohol (PVA) surface layer and a hydrophobic polyvinylidene fluoride (PVDF) membrane substrate. By testing the Janus membrane in direct contact MD experiments using feeds containing a sodium dodecyl sulfate (SDS) surfactant or/and mineral oil, we demonstrated that the dense Janus membrane can simultaneously resist wetting and fouling. This method represents the simplest approach to date for fabricating MD membranes with simultaneous wetting and fouling resistance. Importantly, we also unveil the mechanism of wetting resistance by measuring the breakthrough pressure and surfactant permeation (through the PVA layer) and found that wetting resistance imparted by a dense hydrophilic layer is attributable to capillary pressure. This new insight will potentially change the paradigm of fabricating wetting-resistant membranes and enable robust applications of MD and other membrane contactor processes facing challenges of pore wetting or/and membrane fouling.
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