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<p>Every year, large quantities of glass waste and spent coffee grounds are disposed of in landfills worldwide. In this study, these two underutilized wastes were employed as raw materials to synthesize value-added SiC-bearing abrasive products. Ground glass powder and dried coffee grounds were subjected to carbothermal reduction in an oxygen-free atmosphere at 1550&#xa0;°C to form SiC by the reduction of SiO₂. A continuous gas analyzer, coupled with an HD video camera, was used to monitor and record the reaction process in real-time. The resulting solid products were characterized using Scanning Electron Microscopy (SEM) with Energy-Dispersive Spectroscopy (EDS), X-ray diffraction (XRD), and nitrogen adsorption–desorption analysis. The BET surface area was found to be 97.18&#xa0;m²/g, and the type IV isotherm with H1 hysteresis confirmed the formation of mesoporous SiC with a well-defined pore structure. The reduction process completed rapidly, with volatile gases released within the first 5&#xa0;min, yielding SiC as the dominant phase along with minor residual impurities from the precursor materials. Overall, this study highlights two key outcomes: the development of a high-value abrasive material from neglected waste resources and the potential to reduce reliance on conventional raw materials.</p> Graphical Abstract <p></p>

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Waste-to-Silicon Carbide: Sustainable Synthesis of SiC-Bearing Materials from Spent Coffee Grounds and Glass Waste

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Abdullah Al Mahmood,
  • Rumana Hossain,
  • M. Bodiul Islam,
  • Barun K Das

摘要

Every year, large quantities of glass waste and spent coffee grounds are disposed of in landfills worldwide. In this study, these two underutilized wastes were employed as raw materials to synthesize value-added SiC-bearing abrasive products. Ground glass powder and dried coffee grounds were subjected to carbothermal reduction in an oxygen-free atmosphere at 1550 °C to form SiC by the reduction of SiO₂. A continuous gas analyzer, coupled with an HD video camera, was used to monitor and record the reaction process in real-time. The resulting solid products were characterized using Scanning Electron Microscopy (SEM) with Energy-Dispersive Spectroscopy (EDS), X-ray diffraction (XRD), and nitrogen adsorption–desorption analysis. The BET surface area was found to be 97.18 m²/g, and the type IV isotherm with H1 hysteresis confirmed the formation of mesoporous SiC with a well-defined pore structure. The reduction process completed rapidly, with volatile gases released within the first 5 min, yielding SiC as the dominant phase along with minor residual impurities from the precursor materials. Overall, this study highlights two key outcomes: the development of a high-value abrasive material from neglected waste resources and the potential to reduce reliance on conventional raw materials.

Graphical Abstract