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<p>This study focused on developing a green synthesis method based on the extract of dried green tea without the use of any organic solvent. The structure of manganese ferrite was characterized using XRD analysis. FESEM images showed the octahedral structure of manganese ferrite well. In addition, other FTIR, EDX, and VSM analyses confirmed the physical properties of magnetic particles. The elimination of Congo red dye pollution from aqueous solution by the adsorption technique was studied utilizing manganese ferrite obtained from green tea extract. It was demonstrated that manganese ferrite was capable of effectively removing 99% of Congo red from aqueous solution in a contact time of 30&#xa0;min. by examining the parameters of pH, adsorbent dosage, contact time, and initial concentration. Both Freundlich and Langmuir adsorption isotherms were examined, and the Langmuir isotherm was used to determine the maximal adsorption capacity. Also, kinetic parameters of pseudo-first and pseudo-second order were examined.</p> Graphical abstract <p></p>

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Simple and eco-friendly synthesis of octahedral MnFe2O4 using green tea and application in congo red dye adsorption

  • 期刊论文

  • 发表日期：

    2025年11月27日

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  • R. Nayebi,
  • A. Fallah Shojaei

摘要

This study focused on developing a green synthesis method based on the extract of dried green tea without the use of any organic solvent. The structure of manganese ferrite was characterized using XRD analysis. FESEM images showed the octahedral structure of manganese ferrite well. In addition, other FTIR, EDX, and VSM analyses confirmed the physical properties of magnetic particles. The elimination of Congo red dye pollution from aqueous solution by the adsorption technique was studied utilizing manganese ferrite obtained from green tea extract. It was demonstrated that manganese ferrite was capable of effectively removing 99% of Congo red from aqueous solution in a contact time of 30 min. by examining the parameters of pH, adsorbent dosage, contact time, and initial concentration. Both Freundlich and Langmuir adsorption isotherms were examined, and the Langmuir isotherm was used to determine the maximal adsorption capacity. Also, kinetic parameters of pseudo-first and pseudo-second order were examined.

Graphical abstract