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<p>Azo dye is an emerging organic pollutant that highly affects the quality of urban water. In the present study, adsorption characteristics and mechanisms of Direct Red 79 (DR79) on cationic surfactant, cetyl trimethyl ammonium bromide modified laterite (CML) were investigated. The laterite samples—before and after modification, as well as after DR79 adsorption—were evaluated by BET, FT-IR, EDX, and zeta potential measurements. The influences of pH, mass of adsorbent, adsorption time, ionic strength, and temperature on DR79 removal were thoroughly studied. Different isothermal models, including Freundlich, Langmuir, Temkin, and Dubinin-Radushkevich, were studied to describe DR79 adsorption on the CML material. Adsorption kinetics were fitted by the pseudo first-order, pseudo second-order, and intraparticle diffusion models. Adsorption mechanisms of DR79 on CML were proposed based on the changes in surface functional groups and surface charge after DR79 adsorption. The DR79 removal efficiencies after five regenerations were greater than 83%, and the high performance in dye removal from actual samples demonstrated that CML is an excellent material for removing anionic dyes from urban textile wastewater.</p> Graphical Abstract <p></p>

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Adsorptive removal of anionic dye Direct Red 79 in textile wastewater using cationic surfactant modified laterite material

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • T. M. V. Ngo,
  • T. T. L. Nguyen,
  • X. T. Mai,
  • T. T. A. Duong,
  • V. N. Vu,
  • T. H. Vu,
  • T. D. Pham

摘要

Azo dye is an emerging organic pollutant that highly affects the quality of urban water. In the present study, adsorption characteristics and mechanisms of Direct Red 79 (DR79) on cationic surfactant, cetyl trimethyl ammonium bromide modified laterite (CML) were investigated. The laterite samples—before and after modification, as well as after DR79 adsorption—were evaluated by BET, FT-IR, EDX, and zeta potential measurements. The influences of pH, mass of adsorbent, adsorption time, ionic strength, and temperature on DR79 removal were thoroughly studied. Different isothermal models, including Freundlich, Langmuir, Temkin, and Dubinin-Radushkevich, were studied to describe DR79 adsorption on the CML material. Adsorption kinetics were fitted by the pseudo first-order, pseudo second-order, and intraparticle diffusion models. Adsorption mechanisms of DR79 on CML were proposed based on the changes in surface functional groups and surface charge after DR79 adsorption. The DR79 removal efficiencies after five regenerations were greater than 83%, and the high performance in dye removal from actual samples demonstrated that CML is an excellent material for removing anionic dyes from urban textile wastewater.

Graphical Abstract