Mussel-inspired
surface modification has received significant interest
in recent years because of its simplicity and versatility. The deposition
systems are still mainly limited to molecules with catechol chemical
structures. In this paper, we report a novel deposition system based
on a monophenol, vanillic acid (4-hydroxy-3-methoxybenzoic acid),
to fabricate metal–phenolic network coatings on various substrates.
The results of the water contact angle and zeta potential reveal that
the modified polypropylene microfiltration membrane is underwater
superhydrophobic and positively charged, showing applications in oil/water
separation and dye removal. Furthermore, the single-face modified
Janus membrane is promising in switchable oil/water separation. The
results demonstrate a novel example of the metal–monophenolic
deposition system, which expands the toolbox of surface coatings and
facilitates the understanding of the deposition of phenols.
Substrate-independent,
chemical-durable, and homogeneous coatings
are attracting great interest because of their potential applications
in various fields. Surface coatings based on polydopamine and metal–phenol
networks have been widely investigated. Phytic acid (PA), a plant-derived
compound with six phosphate groups, can coordinate with multivalent
ions to generate metal–phytic acid complex coatings. However,
the formation of the coatings generally proceeds in a discrete step
with a thickness of only about 8 nm via conventional methods. Herein,
the continuous assembly of PA–FeIII coatings has
been proposed by employing an oxidation-mediated assembly strategy.
PA coordinates with an FeII precursor to form soluble complexes,
which are then converted into insoluble PA–FeIII aggregates continuously, enabling coating thickness to be controllable
and time-dependent. The formation and the kinetic growth process of
the coatings are investigated systematically. Highly visible colors
induced by the thin-film interference effect have been observed on
silicon wafers and tailored by modulating the coating thickness. Moreover,
benefiting from the superior chemical resistance and superhydrophilicity
of the PA–FeIII coatings, potential applications
in membrane modification for oil/water emulsion separation have been
demonstrated. The modified membranes exhibit both high flux and separation
efficiency. This work provides a feasible route to form effective
PA–FeIII coatings and expands the versatile platform
of metal–phytic acid surface coatings.
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