A dipeptide-based superhydrogel: Removal of toxic dyes and heavy metal ions from waste water

Nibedita Nandi, Abhishek Baral, Kingshuk Basu, Subhasish Roy, Arindam Banerjee

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

A short peptide-based molecule has been found to form a strong hydrogel at phosphate buffer solution of pH 7.46. The hydrogel has been characterized thoroughly using various techniques including field emission scanning electron microscopy (FE-SEM), wide angle powder X-ray diffraction (PXRD), and rheological analysis. It has been observed from FE-SEM images that entangled nanofiber network is responsible for gelation. Rheological investigation demonstrates that the self-assembly of this synthetic dipeptide results in the formation of mechanically strong hydrogel with storage modulus (G′) around 104 Pa. This gel has been used for removing both cationic and anionic toxic organic dyes (Brilliant Blue, Congo red, Malachite Green, Rhodamine B) and metal ions (Co2+ and Ni2+) from waste water. Moreover, only a small amount of the gelator is required (less than 1 mg/mL) for preparation of this superhydrogel and even this hydrogel can be reused three times for dye/metal ion absorption. This signifies the importance of the hydrogel towards waste water management.

Original languageEnglish
Article numbere22915
JournalBiopolymers
Volume108
Issue number1
DOIs
StatePublished - 1 Jan 2017
Externally publishedYes

Keywords

  • dye absorption
  • hydrogel
  • metal ions absorption
  • peptide
  • supergelator

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Biomaterials
  • Organic Chemistry

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