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Poly(sodium methacrylate)/eggshell particles hydrogel composites as dye sorbent.

Atefeh Darvishi1, Hadi Bakhshi2

  • 1Young Researcher Club, Islamic Azad University, Karaj Branch, Karaj, Iran.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|December 21, 2016
PubMed
Summary

This study developed novel hydrogel composites using waste eggshell particles for effective dye adsorption. The resulting materials show promising performance in removing dyes from water, offering a sustainable solution.

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Area of Science:

  • Materials Science
  • Environmental Science
  • Polymer Chemistry

Background:

  • Eggshell (ES) particles are an abundant, low-cost waste material.
  • Hydrogel composites offer potential for environmental remediation applications.
  • Developing sustainable adsorbents is crucial for wastewater treatment.

Purpose of the Study:

  • To synthesize novel hydrogel composites using eggshell particles for dye adsorption.
  • To investigate the effect of eggshell particle size and content on hydrogel properties and performance.
  • To evaluate the dye adsorption capacity and kinetics of the developed hydrogel composites.

Main Methods:

  • Solution polymerization of sodium methacrylate in the presence of various sizes of ES particles.
  • Characterization of hydrogel composite structure, including pore formation.

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  • Water absorption capacity tests in distilled water and phosphate buffered saline.
  • Dye adsorption experiments using methylene blue (MB) and crystal violet (CV).
  • Kinetic studies to determine the adsorption mechanism.

    • Main Results:

    • Incorporation of ES particles created heterogeneous pores in the poly(sodium methacrylate) (PNaMA) matrix.
    • Hydrogel composites with 20 wt% ES particles of <75 μm size exhibited higher water absorption.
    • ES particles alone showed low adsorption for MB and CV due to electrostatic repulsion.
    • Hydrogel composites demonstrated fast and significant dye adsorbability.
    • A 60 wt% ES-PNaMA composite was cost-effective, with comparable CV adsorption and slightly reduced MB removal compared to the unfilled matrix.
    • Dye adsorption for both ES particles and hydrogel composites followed pseudo-second-order kinetics.

    Conclusions:

    • Eggshell particles can be effectively utilized to create functional hydrogel composites for dye adsorption.
    • The hydrogel composites show enhanced dye removal capabilities compared to raw eggshell particles.
    • The developed materials present a cost-effective and sustainable approach for wastewater treatment, particularly for dye removal.