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<p>Floral waste dumped into water bodies using traditional methods harms water quality and the ecology worldwide. Besides polluting waters, this technique causes environmental problems that need large cleanup costs. Different industries release poisonous and carcinogenic dyes, worsening the environmental concern. To eliminate dye from aqueous solutions and industrial wastes, adsorption is used. To remediate methyl orange, a prevalent dye, this study employs White Chrysanthemum (<i>Chrysanthemum morifolium</i>) flower waste powder. Using a central composite design (CCD) technique of response surface methodology (RSM), batch adsorption tests using dried botanical powder to remove Methyl Orange from water were conducted using pH, temperature, contact time, initial adsorbate concentration, and dose of biosorbents as independent variables. After 60&#xa0;min of interaction, the equilibrium of dye adsorption was achieved. Langmuir and Freundlich adsorption isotherms were used to explain it for the entire concentration range of 20–100&#xa0;mg/L. After 60&#xa0;min at 25&#xa0;˚C and pH 6, 1.5&#xa0;g of biomass was removed with 93.7% efficiency using 30&#xa0;mg/L methyl orange dye. XRD shows crystalline phase in bio adsorbents, with some amorphous carbon (18–35θ). FT-IR spectra detected alkene, hydroxyl, and carbonyl functional groups. Bio-adsorption of methyl orange requires functional groups observed in FT-IR spectra. The kinetic adsorption isotherms models have shown that the adsorbent follows the pseudo-second-order kinetic model. The isotherms were well fitted with Langmuir and Freundlich isotherms model, indicating monolayer adsorption of Methyl Orange Dye on the surface of White Chrysanthemum petals. This inexpensive biosorbent reduces floral waste sustainably, reducing environmental contamination, according to the study. This biodegradable, affordable, and eco-friendly method removes methyl orange color from contaminated water effluents and manages floral waste sustainably.</p> Graphical abstract <p></p>

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Optimizing Methyl Orange Dye Removal from Aqueous Solutions Using White Chrysanthemum Floral Waste-Derived Bioadsorbent: A Study of Kinetics, Thermodynamics, Isotherms, and RSM Optimization

  • 期刊论文

  • 发表日期：

    2025年3月25日

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  • Saloni Agarwal,
  • Harshita Jain,
  • Renu Dhupper,
  • Ashish Mathur

摘要

Floral waste dumped into water bodies using traditional methods harms water quality and the ecology worldwide. Besides polluting waters, this technique causes environmental problems that need large cleanup costs. Different industries release poisonous and carcinogenic dyes, worsening the environmental concern. To eliminate dye from aqueous solutions and industrial wastes, adsorption is used. To remediate methyl orange, a prevalent dye, this study employs White Chrysanthemum (Chrysanthemum morifolium) flower waste powder. Using a central composite design (CCD) technique of response surface methodology (RSM), batch adsorption tests using dried botanical powder to remove Methyl Orange from water were conducted using pH, temperature, contact time, initial adsorbate concentration, and dose of biosorbents as independent variables. After 60 min of interaction, the equilibrium of dye adsorption was achieved. Langmuir and Freundlich adsorption isotherms were used to explain it for the entire concentration range of 20–100 mg/L. After 60 min at 25 ˚C and pH 6, 1.5 g of biomass was removed with 93.7% efficiency using 30 mg/L methyl orange dye. XRD shows crystalline phase in bio adsorbents, with some amorphous carbon (18–35θ). FT-IR spectra detected alkene, hydroxyl, and carbonyl functional groups. Bio-adsorption of methyl orange requires functional groups observed in FT-IR spectra. The kinetic adsorption isotherms models have shown that the adsorbent follows the pseudo-second-order kinetic model. The isotherms were well fitted with Langmuir and Freundlich isotherms model, indicating monolayer adsorption of Methyl Orange Dye on the surface of White Chrysanthemum petals. This inexpensive biosorbent reduces floral waste sustainably, reducing environmental contamination, according to the study. This biodegradable, affordable, and eco-friendly method removes methyl orange color from contaminated water effluents and manages floral waste sustainably.

Graphical abstract