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<p>Spent Coffee Grounds (SCGs) represent an abundant and underutilised biomass with great potential as a source of natural dyes for the textile industry. This study investigates the optimisation of the extraction process to maximise dye yield from SCGs. Various extraction parameters, including temperature, extraction time, extraction pH, and solid-liquid ratio, were systematically examined to identify the most effective conditions for dye recovery. The combined effects of these extraction conditions on the total phenolic content (TPC) and colour yield (K/S) were studied using a three-level four-factor Box-Behnken design. The optimum conditions for dye extraction were found to be 11, 75&#xa0;min, 70&#xa0;°C, and 80&#xa0;g/L for extraction pH, extraction time and temperature, and mass of the powder respectively.</p>

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Eco-friendly Process Optimisation of Natural Dye Extraction from Spent Coffee Grounds Using Response Surface Methodology

  • 期刊论文

  • 发表日期：

    2025年9月12日

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  • Ines Khemissi,
  • Noureddine Baaka,
  • Faouzi Khedher,
  • Boubaker Jaouachi

摘要

Spent Coffee Grounds (SCGs) represent an abundant and underutilised biomass with great potential as a source of natural dyes for the textile industry. This study investigates the optimisation of the extraction process to maximise dye yield from SCGs. Various extraction parameters, including temperature, extraction time, extraction pH, and solid-liquid ratio, were systematically examined to identify the most effective conditions for dye recovery. The combined effects of these extraction conditions on the total phenolic content (TPC) and colour yield (K/S) were studied using a three-level four-factor Box-Behnken design. The optimum conditions for dye extraction were found to be 11, 75 min, 70 °C, and 80 g/L for extraction pH, extraction time and temperature, and mass of the powder respectively.