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Waste-Glass-Derived Porous Silica: Synthesis and Structural Characterization.

Antônia Millena de Oliveira Lima1,2, Manuel Pedro Fernandes Graça3, Imen Hammami3

  • 1Instituto Federal de Educação Ciência e Tecnologia do Maranhão, Campus Imperatriz, São Luís 65919-050, Brazil.

Materials (Basel, Switzerland)
|February 13, 2026
PubMed
Summary
This summary is machine-generated.

Waste glass is a sustainable silica source for synthesizing mesoporous silica materials. This research demonstrates its potential as a precursor, though further optimization is needed for ordered structures.

Keywords:
mesoporoussilica gelsodium hydroxidewaste glass

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Area of Science:

  • Materials Science
  • Green Chemistry
  • Nanotechnology

Background:

  • Conventional silica precursors are often energy-intensive to produce.
  • Waste glass presents an abundant and sustainable alternative silica source.
  • Developing eco-friendly synthesis routes for porous materials is crucial.

Purpose of the Study:

  • To investigate the reuse of waste glass as a sustainable silica source.
  • To synthesize mesoporous silica materials from waste glass-derived silica gel.
  • To characterize the structural, morphological, and textural properties of the synthesized materials.

Main Methods:

  • Alkaline dissolution of waste glass powder using sodium hydroxide to produce silica gel.
  • Synthesis of porous silica using the silica gel as a precursor.
  • Characterization using X-ray Diffraction (XRD), Fourier-Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Zeta potential, and Nitrogen sorption analysis.

Main Results:

  • Amorphous silica structures were confirmed by XRD.
  • FTIR spectra indicated successful silica network formation.
  • SEM showed spherical particles (0.19 ± 0.02 µm for silica gel, 0.15 ± 0.03 µm for mesoporous silica).
  • Good colloidal stability was observed via zeta potential.
  • Nitrogen sorption revealed limited specific surface area due to low silica gel solubility, hindering ordered mesostructure formation.

Conclusions:

  • Waste glass-derived silica gel is a viable precursor for porous silica synthesis.
  • Current synthesis conditions do not yield highly ordered mesostructures.
  • Further control over precursor solubility and pH is necessary for improved material synthesis.