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Pseudopeptide-Based Hydrogels Trapping Methylene Blue and Eosin Y.

Lorenzo Milli1, Nicola Zanna1, Andrea Merlettini1

  • 1Dipartimento di Chimica Ciamician, Università di Bologna, Via Selmi, 2-, 40126, Bologna, Italy.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 16, 2016
PubMed
Summary

This study developed pseudopeptide hydrogels for dye removal. Graphene oxide enhanced trapping of methylene blue (MB) via π-π and electrostatic interactions, but not eosin Y (EY).

Keywords:
dye adsorptiongelatorsgraphene oxidehydrogelspseudopeptides

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Area of Science:

  • Supramolecular chemistry
  • Materials science
  • Nanotechnology

Background:

  • Hydrogels are versatile materials with applications in adsorption and separation.
  • Pseudopeptide gelators offer tunable properties for hydrogel formation.
  • Graphene oxide (GO) is a nanomaterial known for its adsorption capabilities.

Purpose of the Study:

  • To synthesize and characterize novel hydrogels based on a pseudopeptide gelator.
  • To investigate the effect of gelator concentration and graphene oxide addition on hydrogel properties.
  • To evaluate the efficiency of these hydrogels in trapping cationic and anionic dyes.

Main Methods:

  • Preparation of four different hydrogels by varying pseudopeptide gelator (Fmoc-l-Phe-d-Oxd-OH) concentration and incorporating graphene oxide (GO).
  • Rheological studies to assess the mechanical strength of the pure and GO-loaded hydrogels.
  • Adsorption experiments to determine the hydrogels' efficiency in trapping methylene blue (MB) and eosin Y (EY) dyes.

Main Results:

  • Pure hydrogels exhibited slightly greater strength than GO-loaded hydrogels.
  • Both pure and GO-loaded hydrogels effectively trapped cationic methylene blue (MB) through π-π and electrostatic interactions.
  • Anionic eosin Y (EY) removal was less efficient due to unfavorable electrostatic interactions.

Conclusions:

  • Pseudopeptide-based hydrogels, with or without graphene oxide, show promise for adsorbing cationic dyes.
  • The incorporation of graphene oxide can influence hydrogel properties and adsorption efficiency.
  • Electrostatic interactions play a critical role in the dye-trapping mechanism of these hydrogels.