Easy fabrication of mussel inspired coated foam and its optimization for the facile removal of copper from aqueous solutions

Antonio Turco, Antonio Pennetta, Antonio Caroli, Elisabetta Mazzotta, Anna Grazia Monteduro, Elisabetta Primiceri, Giuseppe de Benedetto, Cosimino Malitesta

Research output: Contribution to journalArticlepeer-review

Abstract

Herein we present a straightforward approach for the use of polydopamine (PDA) in adsorption of heavy metals from aqueous solutions. This is achieved by fabricating a healthy and environmentally friendly polydimethylsiloxane (PDMS) foam with a mussel inspired PDA layer deposited on the surface. Critical adsorption parameters (pH, temperature and PDA thickness) are optimized by the application of experimental design methodology. Adsorption kinetics and isotherms are studied in detail evidencing a good fitting with Langmuir isotherm and pseudo-second-order kinetics thus suggesting the occurrence of a chemical sorption process with monolayer nature between metals and PDMS/PDA foam. Intraparticle diffusion model evidences good accessibility and high affinity of binding sites on PDA surface. Once adsorbed, metals are reduced to a lower toxic form and can be then removed by a mild acidic treatment thus being easily collected and stocked.

Original languageEnglish
Pages (from-to)401-411
Number of pages11
JournalJournal of Colloid and Interface Science
Volume552
DOIs
Publication statusPublished - Sep 15 2019

Keywords

  • Foam
  • Heavy metals
  • PDMS
  • Polydopamine
  • Remediation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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