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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
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  3. Biosorption Of Rhodamine B And Sunset Yellow Dyes On Cross-linked Chitosan-alginate Biocomposite Beads: Experimental And Theoretical Studies.
  1. Home
  3. Biosorption Of Rhodamine B And Sunset Yellow Dyes On Cross-linked Chitosan-alginate Biocomposite Beads: Experimental And Theoretical Studies.

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Biosorption of rhodamine B and sunset yellow dyes on cross-linked chitosan-alginate biocomposite beads: Experimental

Zeynep Mine Şenol1, Hasan Arslanoğlu2, Zehra Seba Keskin3

  • 1Sivas Cumhuriyet University, Faculty of Health Sciences, Department of Nutrition and Diet, 58140 Sivas, Turkey.

International Journal of Biological Macromolecules
|January 17, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

This study demonstrates that cross-linked chitosan-alginate (Ch-A) biocomposite beads effectively remove Rhodamine B (Rd-B) and Sunset Yellow (SY) dyes from water. Combining experimental and theoretical methods reveals key binding interactions for efficient dye biosorption.

Keywords:
AlginateBiocompositeChitosanRhodamine BSunset yellow, biosorption, wastewater treatment

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemical Engineering

Background:

  • Textile and food industries generate dye wastewater, posing environmental risks.
  • Conventional dye removal methods often have limitations in efficiency and sustainability.
  • Biocomposite materials offer a promising alternative for eco-friendly water purification.

Purpose of the Study:

  • To investigate the biosorption of Rhodamine B (Rd-B) and Sunset Yellow (SY) dyes using cross-linked chitosan-alginate (Ch-A) biocomposite beads.
  • To elucidate the biosorption mechanisms through a combination of experimental and theoretical studies.
  • To assess the potential of Ch-A biocomposite beads as an effective material for dye removal in water treatment.

Main Methods:

  • Synthesis and characterization of cross-linked chitosan-alginate (Ch-A) biocomposite beads.
  • Experimental biosorption studies to determine dye uptake capacity, kinetics, and thermodynamics.
  • Monte Carlo (MC) simulations and molecular dynamics (MD) calculations to investigate molecular interactions between dyes and the biocomposite.
  • Langmuir isotherm and pseudo-order kinetic models for data analysis.

    • Main Results:

    • Ch-A biocomposite beads exhibited maximum biosorption capacities of 43.6 mg g⁻¹ for Rd-B and 25.1 mg g⁻¹ for SY.
    • Biosorption kinetics followed pseudo first order (PFO) for Rd-B and pseudo second order (PSO) for SY.
    • Thermodynamic analysis indicated spontaneous and endothermic adsorption processes.
    • MC and MD simulations identified hydrogen bonds, electrostatic attractions, and π-π interactions as key binding mechanisms.

    Conclusions:

    • The Ch-A biocomposite beads are highly effective for removing Rd-B and SY dyes from aqueous solutions.
    • The combination of experimental and theoretical approaches provides a comprehensive understanding of the biosorption process.
    • This study validates the use of Ch-A biocomposites for sustainable water purification, highlighting the synergy between empirical data and computational modeling.