Bioinspired tannic acid-copper complexes as selective coating for nanofiltration membranes

Tina Chakrabarty, Liliana Pérez-Manríquez, Pradeep Neelakanda, Klaus-Viktor Peinemann

Research output: Contribution to journalArticlepeer-review

71 Scopus citations


Bio-polyphenols that are present in tea, date fruits, chockolate and many other plants have been recognized as scaffold material for the manufacture of composite filtration membranes. These phenolic biomolecules possess abundant gallol (1,2,3-trihydroxyphenyl) and catechol (1,2-dihydroxyphenyl) functional groups, which allow the spontaneous formation of a thin polymerized layer at the right pH conditions. Here, we report a facile and cost-effective method to coat porous membranes via the complexation of tannic acid (TA) and cupric acetate (mono hydrate) through co-deposition. The modified membranes were investigated by XPS, ATR/FTIR, water contact angle, SEM and water permeance for a structural and morphological analysis. The obtained results reveal that the modified membranes with TA and cupric acetate (CuII) developed a thin skin layer, which showed excellent hydrophilicity with good water permeance. These membranes were tested with different molecular weight polyethylene glycols (PEG) in aqueous solution; the MWCO was around 600 Daltons.
Original languageEnglish (US)
Pages (from-to)188-194
Number of pages7
JournalSeparation and Purification Technology
StatePublished - Apr 27 2017


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