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Surface Deposition of Juglone-Fe III on Microporous Membranes for Oil-Water Separation and Dyes Adsorption.

Deposition of dopamine and tannic acid has received great attention in the fields of surface and interface science and technology. The deposition behaviors of various metal-phenolic systems have been investigated, and it is generally accepted that at least one catechol group is essential to the formation of the coatings. Herein, we report a novel and effective surface coating system based on the coordination complexes of FeIII ions with a natural product juglone that contains only one phenolic hydroxyl. We investigated the deposition behaviors of this novel system on various substrates. Microporous polypropylene (PP) membrane modified with juglone-FeIII coatings is superhydrophilic and underwater superoleophobic, showing high separation efficiency and good reusability for various oil/water emulsions. In addition, the modified membrane can adsorb anionic dyes and selectively remove anionic dyes from dye mixtures with high efficiency. We further demonstrated that the coating is a result of synergetic effect of juglone-FeIII coordination and FeIII hydrolysis. This work not only provides new insights in surface deposition systems but also expands the polyphenol family for surface coatings of multifunctional materials.

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