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Background <p>Indigo carmine (IC) and methyl red (MR) are the anionic dyes used widely in textile and food industries. Since, these kinds of dyes are very commonly employed and surplus are released to the water bodies, they are to be removed to avoid the toxic effect to humans and aquatic lives.</p> Method <p>Very simple, ion-exchange chromatographic methods have been discovered using strong anion exchange resin as dye trapper for removal of IC and MR from aqueous solutions.</p> Results <p>Experimentally it has been found that 1&#xa0;g of resin showed removal of &gt; 95 and 93.6% of IC and MR, respectively up to 150 and 25&#xa0;µg/mL under the room temperature at 1&#xa0;mL/min flow rate. The ion-exchange capacity has been determined to be 0.2028 and 0.1049&#xa0;mol/g of resin, respectively. The effective pH for efficient dye exchange has been in the range from 8 to 10.5 for IC and 4.3–5.5 for MR, respectively. The results of thermodynamic studies showed the endothermic nature of exchange of dyes onto the resin. The reversibility of the exchange process has been ascertained using neutral sodium nitrite. The Adams–Bohart, Yoon–Nelson, and Thomas models have been used to study adsorption dynamics of IC and MR dyes.</p> Conclusion <p>A very innovative reversible experimental procedure to remove two dyes, namely, IC and MR, from water or aqueous solutions is proposed. The experimental outcome of these methods is recommendable for routine process in industries or water purification plants.</p>

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A Green Approach for Removal of Anionic Indigo Carmine and Methyl Red from Water Using Ion Exchange Chromatographic Elution

  • 期刊论文

  • 发表日期：

    2025年5月19日

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  • Harohally Paramesh Sumathi,
  • Hullikal Chandrashekar Prameela,
  • Tammadahalli Nanjundaswamy Bindushree,
  • Nagaraju Rajendraprasad

摘要

Background

Indigo carmine (IC) and methyl red (MR) are the anionic dyes used widely in textile and food industries. Since, these kinds of dyes are very commonly employed and surplus are released to the water bodies, they are to be removed to avoid the toxic effect to humans and aquatic lives.

Method

Very simple, ion-exchange chromatographic methods have been discovered using strong anion exchange resin as dye trapper for removal of IC and MR from aqueous solutions.

Results

Experimentally it has been found that 1 g of resin showed removal of > 95 and 93.6% of IC and MR, respectively up to 150 and 25 µg/mL under the room temperature at 1 mL/min flow rate. The ion-exchange capacity has been determined to be 0.2028 and 0.1049 mol/g of resin, respectively. The effective pH for efficient dye exchange has been in the range from 8 to 10.5 for IC and 4.3–5.5 for MR, respectively. The results of thermodynamic studies showed the endothermic nature of exchange of dyes onto the resin. The reversibility of the exchange process has been ascertained using neutral sodium nitrite. The Adams–Bohart, Yoon–Nelson, and Thomas models have been used to study adsorption dynamics of IC and MR dyes.

Conclusion

A very innovative reversible experimental procedure to remove two dyes, namely, IC and MR, from water or aqueous solutions is proposed. The experimental outcome of these methods is recommendable for routine process in industries or water purification plants.