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<p>Excess fluoride in groundwater poses a serious public health concern in arid and semi-arid regions, where prolonged consumption of water exceeding the World Health Organization guideline value of 1.5&#xa0;mg·L⁻¹ can lead to dental and skeletal fluorosis. Developing low-cost, locally available, and environmentally sustainable defluoridation materials therefore remains a priority. This study explores the use of marble powder, an abundant waste byproduct from stone-cutting industries, as a cost-effective adsorbent for fluoride removal from aqueous solutions over a wide range of contamination levels. Batch adsorption experiments were conducted to assess the influence of pH, adsorbent dosage, initial fluoride concentration, agitation speed, and temperature. The material was characterized using FTIR, XRD, and textural analyses, including surface area, porosity, and point of zero charge. Marble powder demonstrated high defluoridation performance across fluoride concentrations representative of contaminated groundwater (10–100&#xa0;mg·L⁻¹). Under optimized conditions (pH 5.6, dosage 8&#xa0;g·L⁻¹), removal efficiencies reached 96.1% at 10&#xa0;mg·L⁻¹ and remained significant at higher concentrations. The pHₚzc value of 8.0 indicates that adsorption is favored at acidic to near-neutral pH due to electrostatic interactions. Thermodynamic results confirmed that the process is spontaneous and endothermic. Overall, marble powder shows strong potential as a sustainable pretreatment material for fluoride-rich waters prior to conventional polishing technologies.</p>

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Defluoridation of Fluoride-Rich Water by Sorption onto Waste Marble Powder: Kinetic, Thermodynamic and Process Studies

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • L. Mansouri,
  • F. Bouamra,
  • N. El Hanafi,
  • K. Louhab,
  • N. Drouiche,
  • H. Lounici

摘要

Excess fluoride in groundwater poses a serious public health concern in arid and semi-arid regions, where prolonged consumption of water exceeding the World Health Organization guideline value of 1.5 mg·L⁻¹ can lead to dental and skeletal fluorosis. Developing low-cost, locally available, and environmentally sustainable defluoridation materials therefore remains a priority. This study explores the use of marble powder, an abundant waste byproduct from stone-cutting industries, as a cost-effective adsorbent for fluoride removal from aqueous solutions over a wide range of contamination levels. Batch adsorption experiments were conducted to assess the influence of pH, adsorbent dosage, initial fluoride concentration, agitation speed, and temperature. The material was characterized using FTIR, XRD, and textural analyses, including surface area, porosity, and point of zero charge. Marble powder demonstrated high defluoridation performance across fluoride concentrations representative of contaminated groundwater (10–100 mg·L⁻¹). Under optimized conditions (pH 5.6, dosage 8 g·L⁻¹), removal efficiencies reached 96.1% at 10 mg·L⁻¹ and remained significant at higher concentrations. The pHₚzc value of 8.0 indicates that adsorption is favored at acidic to near-neutral pH due to electrostatic interactions. Thermodynamic results confirmed that the process is spontaneous and endothermic. Overall, marble powder shows strong potential as a sustainable pretreatment material for fluoride-rich waters prior to conventional polishing technologies.