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<p>Dye effluents from both food and clothing are extremely dangerous to human health. Adsorption can eliminate hazardous organic dyes present in industrial wastewater. Recyclable adsorbents are advantageous due to the difficulties associated with carbon recycling. Santa Barbara Amorphous-15 (SBA-15)/ethylenediamine was synthesized, characterized, and employed to adsorb food dyes (brilliant blue, allura red, and tartrazine) in water. The removal effectiveness of the adsorbent was evaluated concerning pH, dosage, concentration, time, and temperature. The adsorption mechanism was examined using pseudo-first and pseudo-second-order kinetics. Interactions between adsorbent and adsorbate were investigated utilizing the Langmuir, Freundlich, and Temkin isotherms. A comparison and analysis of the thermodynamic parameters (∆G°, ∆S°, and ∆H°) was made. The Langmuir adsorption isotherm confirmed monolayer adsorption for all dyes, with R<sup>2</sup> values equal to 0.99. The kinetics adhered to a pseudo-second-order model, with a rate constant (k<sub>2</sub>) ranging from 0.00002 to 0.0002&#xa0;g/mg min. The adsorption capabilities of SBA-15/ethylenediamine for tartrazine, brilliant blue, and allura red were equal to 694.44, 429.18, and 884.95&#xa0;mg/g, respectively. At 25&#xa0;°C, the adsorption wass characterized by a decrease in entropy, a negative enthalpy, and a decrease in free energy. The recyclability of adsorbent was confirmed for three cycles, demonstrating no substantial decrease in removal efficiency. The SBA-15/ethylenediamine nanocomposite efficiently eliminated water-soluble dyes from food and textile effluents.</p>

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Influence of PH, ionic strength, and temperature on AZO dye adsorption by ethylenediamine-modified SBA-15

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • Niveditha S,
  • Venkatachalam K

摘要

Dye effluents from both food and clothing are extremely dangerous to human health. Adsorption can eliminate hazardous organic dyes present in industrial wastewater. Recyclable adsorbents are advantageous due to the difficulties associated with carbon recycling. Santa Barbara Amorphous-15 (SBA-15)/ethylenediamine was synthesized, characterized, and employed to adsorb food dyes (brilliant blue, allura red, and tartrazine) in water. The removal effectiveness of the adsorbent was evaluated concerning pH, dosage, concentration, time, and temperature. The adsorption mechanism was examined using pseudo-first and pseudo-second-order kinetics. Interactions between adsorbent and adsorbate were investigated utilizing the Langmuir, Freundlich, and Temkin isotherms. A comparison and analysis of the thermodynamic parameters (∆G°, ∆S°, and ∆H°) was made. The Langmuir adsorption isotherm confirmed monolayer adsorption for all dyes, with R2 values equal to 0.99. The kinetics adhered to a pseudo-second-order model, with a rate constant (k2) ranging from 0.00002 to 0.0002 g/mg min. The adsorption capabilities of SBA-15/ethylenediamine for tartrazine, brilliant blue, and allura red were equal to 694.44, 429.18, and 884.95 mg/g, respectively. At 25 °C, the adsorption wass characterized by a decrease in entropy, a negative enthalpy, and a decrease in free energy. The recyclability of adsorbent was confirmed for three cycles, demonstrating no substantial decrease in removal efficiency. The SBA-15/ethylenediamine nanocomposite efficiently eliminated water-soluble dyes from food and textile effluents.