Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 656, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2022.120616
Keywords
Tannic acid; One-pot fabrication; Vacuum filtration; Janus membrane; Emulsion separation
Categories
Funding
- Ministry of Science and Technology (MOST) in Taiwan [109-2221-E-002-102MY3, 110-2622-E-002-014, 111-2634-F-002-016]
- Feature Area Research Center Program within Ministry of Education (MOE) [111L891801, 111L9006]
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In this study, a multi-functional Janus membrane was fabricated by depositing mussel-inspired tannic acid (TA) on hydrophobic PVDF surfaces using a one-pot fabrication method. The membrane demonstrated high separation efficiency and remained stable in harsh environments. This nature-inspired Janus membrane using a green modification method provides new insights for oily wastewater treatment.
In contrast to the traditional coating of tannic acid (TA), the deposition of mussel-inspired TA on hydrophobic PVDF surfaces is realized using a one-pot fabrication method, thus forming a multi-functional Janus membrane. In this study, a facile TA modification using vacuum filtration is demonstrated to modulate the wettability of PVDF on a single side. With the introduction of sodium periodate, rapid chemical oxidation of TA occurs, which results in the design of a thin hydrophilic coverage over one side of the PVDF membrane. This multi-functional Janus membrane demonstrates a higher separation efficiency of similar to 99% and similar to 97% for both oil-in-water and water-in-oil emulsions. The hydrophilic coating of the Janus PVDF-TA membrane remains stable in harsh environments. Moreover, the recyclability of the as-prepared membrane evidenced an oil rejection performance of 99% for three repeating cycles. This nature-inspired Janus membrane using a green modification method is new insights for integrating the area of bionics into oily wastewater treatment.
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