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<p>The contamination of wastewater with cationic dyes, such as methylene blue (MB), poses significant environmental challenges due to their toxicity and persistence in aquatic systems. This study aims to develop a high-efficiency adsorbent for MB dye removal by synthesizing a MgAl LDH-Chitosan/Serpentine nanocomposite using a modified co-precipitation method. The nanocomposite was analyzed through XRD, SEM, FTIR, and BET, revealing a well-dispersed agglomerated structure with particle sizes ranging from 50 to 70&#xa0;nm and enhanced surface properties. Adsorption experiments demonstrated improved performance, achieving a maximum adsorption capacity of 32.5&#xa0;mg/g, surpassing LDH-Chitosan and Serpentine by 20% and 35%, respectively, under optimal conditions (pH 7, adsorbent dose 0.05&#xa0;g/L). Adsorption kinetics aligned with the pseudo-second-order model, while equilibrium data were best described by the Langmuir isotherm, confirming monolayer adsorption. The superior adsorption efficiency is attributed to synergistic interactions between the components, enhancing surface area and active site availability. These findings indicate that the synthesized MgAl LDH-Chitosan/Serpentine nanocomposite is a promising, cost-effective, and sustainable adsorbent for eliminating cationic dyes from industrial wastewater.</p>

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Insights into the Structure and Removal Performance of Cationic Dyes by Adsorption onto MgAl LDH-Chitosan/Serpentine Nanocomposite

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Doaa Gamal,
  • Ahmed Abd-Elkhalek,
  • Mohamed Shaban,
  • Sameerah I. Al-Saeedi,
  • A. M. Elbasiony,
  • Gehan H. Abd El-Aziz,
  • Fatma Mohamed

摘要

The contamination of wastewater with cationic dyes, such as methylene blue (MB), poses significant environmental challenges due to their toxicity and persistence in aquatic systems. This study aims to develop a high-efficiency adsorbent for MB dye removal by synthesizing a MgAl LDH-Chitosan/Serpentine nanocomposite using a modified co-precipitation method. The nanocomposite was analyzed through XRD, SEM, FTIR, and BET, revealing a well-dispersed agglomerated structure with particle sizes ranging from 50 to 70 nm and enhanced surface properties. Adsorption experiments demonstrated improved performance, achieving a maximum adsorption capacity of 32.5 mg/g, surpassing LDH-Chitosan and Serpentine by 20% and 35%, respectively, under optimal conditions (pH 7, adsorbent dose 0.05 g/L). Adsorption kinetics aligned with the pseudo-second-order model, while equilibrium data were best described by the Langmuir isotherm, confirming monolayer adsorption. The superior adsorption efficiency is attributed to synergistic interactions between the components, enhancing surface area and active site availability. These findings indicate that the synthesized MgAl LDH-Chitosan/Serpentine nanocomposite is a promising, cost-effective, and sustainable adsorbent for eliminating cationic dyes from industrial wastewater.