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<p>The discharge of persistent synthetic dyes, such as Carbol Fuchsin (CF), from textile and related industries poses a significant environmental and public health concern due to their toxicity and resistance to natural degradation. This study presents the development and application of a low-cost, sustainable adsorbent activated carbon derived from rice husk ash (ARHA) for the efficient removal of CF from contaminated water. The adsorbent was characterized using FT-IR, SEM-EDX, XRD, BET and zeta potential analysis, revealing a mesoporous, amorphous structure with a specific surface area of 51.25&#xa0;m²/g and a point of zero charge (pHpzc) at 8.3. This study presents the first application of H₂O₂ activated rice husk ash for Carbol Fuchsin removal, achieving a superior capacity of 205.24&#xa0;mg/g, significantly higher. Systematic batch adsorption studies were conducted to optimize the process parameters, achieving a maximum removal efficiency of over 96% at an adsorbent dosage of 0.08&#xa0;g/50 mL, a contact time of 150&#xa0;min, and a pH of 9.0. The adsorption kinetics were best described by the pseudo-second-order model, indicating that chemisorption was the rate-limiting step. Thermodynamic analysis (negative ΔG° and ΔH°) established the process as spontaneous and exothermic. The findings demonstrate that ARHA, an agricultural waste derivative, is a highly effective, eco-friendly, and economically viable material for the advanced treatment of dye-laden industrial wastewater, offering a promising alternative to conventional remediation methods.</p>

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Activated rice husk ash: a sustainable and high capacity adsorbent for the remediation of Carbol Fuchsin dye from aqueous effluents

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月14日

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  • Asmit Patel,
  • Adarsh Pratap Singh,
  • Anshika Sharma,
  • Priya Tiwari,
  • Shilpa Nair,
  • Shivam Yadav

摘要

The discharge of persistent synthetic dyes, such as Carbol Fuchsin (CF), from textile and related industries poses a significant environmental and public health concern due to their toxicity and resistance to natural degradation. This study presents the development and application of a low-cost, sustainable adsorbent activated carbon derived from rice husk ash (ARHA) for the efficient removal of CF from contaminated water. The adsorbent was characterized using FT-IR, SEM-EDX, XRD, BET and zeta potential analysis, revealing a mesoporous, amorphous structure with a specific surface area of 51.25 m²/g and a point of zero charge (pHpzc) at 8.3. This study presents the first application of H₂O₂ activated rice husk ash for Carbol Fuchsin removal, achieving a superior capacity of 205.24 mg/g, significantly higher. Systematic batch adsorption studies were conducted to optimize the process parameters, achieving a maximum removal efficiency of over 96% at an adsorbent dosage of 0.08 g/50 mL, a contact time of 150 min, and a pH of 9.0. The adsorption kinetics were best described by the pseudo-second-order model, indicating that chemisorption was the rate-limiting step. Thermodynamic analysis (negative ΔG° and ΔH°) established the process as spontaneous and exothermic. The findings demonstrate that ARHA, an agricultural waste derivative, is a highly effective, eco-friendly, and economically viable material for the advanced treatment of dye-laden industrial wastewater, offering a promising alternative to conventional remediation methods.