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<p>This study presents the first report on the development of a Karaya gum (KG)/chitosan-based nanocomposite embedded with silver nanoparticles (AgNPs) for multifunctional applications in wastewater treatment, uniquely combining the complementary properties of two biopolymers to stabilize and enhance AgNP performance. Structural characterization via SEM, TEM, XRD, and FTIR confirmed a porous nanocomposite matrix with homogeneously embedded crystalline AgNPs, stabilized by interactions between biopolymer functional groups (–COOH, –NH₂) and uniformly dispersed AgNPs (25–100&#xa0;nm, average 60&#xa0;nm). The material exhibited high adsorption capacity for methylene blue (MB) dye (91&#xa0;mg/g at pH 6), following pseudo-second-order kinetics and Langmuir isotherm behavior. The thermodynamic results confirmed spontaneous, endothermic adsorption with increased entropy at higher temperatures. The incorporation of AgNPs significantly enhanced antimicrobial efficacy, producing a pronounced inhibition zone against <i>Escherichia coli</i>. The nanocomposite retained 64% adsorption efficiency after five regeneration cycles, underscoring its reusability. By synergizing the unique functional group chemistry of KG and chitosan with the antimicrobial and catalytic effects of AgNPs, this work introduces a novel, biodegradable platform for integrated dye adsorption and pathogen control, offering promising implications for sustainable wastewater remediation.</p>

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Enhanced Adsorption and Kinetic Analysis of Methylene Blue Adsorption Using Karay Gum/Chitosan/Ag Nanocomposite: A Sustainable Approach for Wastewater Treatment

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • Ahmed M. Yousif,
  • Zeineb Hamden,
  • Ehab S. Gad,
  • Mahmoud A. Abdelaziz,
  • Ali A. Keshk,
  • Ibrahim Saleem Alatawi,
  • Hossa F. Al-Shareef,
  • Abdulhadi H. Almarri,
  • Modather F. Hussein,
  • Yousef A. Bin Jardan

摘要

This study presents the first report on the development of a Karaya gum (KG)/chitosan-based nanocomposite embedded with silver nanoparticles (AgNPs) for multifunctional applications in wastewater treatment, uniquely combining the complementary properties of two biopolymers to stabilize and enhance AgNP performance. Structural characterization via SEM, TEM, XRD, and FTIR confirmed a porous nanocomposite matrix with homogeneously embedded crystalline AgNPs, stabilized by interactions between biopolymer functional groups (–COOH, –NH₂) and uniformly dispersed AgNPs (25–100 nm, average 60 nm). The material exhibited high adsorption capacity for methylene blue (MB) dye (91 mg/g at pH 6), following pseudo-second-order kinetics and Langmuir isotherm behavior. The thermodynamic results confirmed spontaneous, endothermic adsorption with increased entropy at higher temperatures. The incorporation of AgNPs significantly enhanced antimicrobial efficacy, producing a pronounced inhibition zone against Escherichia coli. The nanocomposite retained 64% adsorption efficiency after five regeneration cycles, underscoring its reusability. By synergizing the unique functional group chemistry of KG and chitosan with the antimicrobial and catalytic effects of AgNPs, this work introduces a novel, biodegradable platform for integrated dye adsorption and pathogen control, offering promising implications for sustainable wastewater remediation.