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<p>Textile wastewater containing dyes poses significant environmental concerns and represents a necessity for treatment, as untreated effluents pose serious risks to aquatic organisms and ecosystem health, particularly when conventional adsorbents exhibit slow uptake and limited efficiency. Here, a chitosan/polypyrrole (Chit/PPy) composite is proposed as an effective solution, enabling rapid adsorption of reactive black 5. Pyrrole was polymerized in aqueous solution with ammonium persulfate as the oxidant in the presence of chitosan to obtain the Chit/PPy composite. The composite consisted of chitosan coated with spherical polypyrrole nanoparticles of 100&#xa0;nm in diameter and polydispersity index in sizes of 1.1. Batch adsorption experiments showed rapid RB-5 dye uptake, with more than two-thirds of the dye removed after 15&#xa0;min and almost full decolorization at equilibrium. Kinetic studies demonstrated that the adsorption process was described by the pseudo-second order model, indicating a chemisorption mechanism, whereas at higher concentrations, intraparticle diffusion contributed to mass transfer. The equilibrium adsorption capacities (<i>q</i><sub><i>e</i></sub>) increased with initial dye concentration, reaching 145.9&#xa0;mg/g. At higher adsorbent loadings, the equilibrium is reached faster. For an adsorbent dosage of 0.005&#xa0;g, the observed <i>q</i><sub><i>e</i></sub> was 338.6&#xa0;mg/g according to the pseudo-second order model. These findings highlight the synergistic effect of chitosan and PPy in promoting fast adsorption, showing that Chit/PPy is a cost-effective adsorbent for textile wastewater treatment. The innovation of this work is fast adsorption kinetics, achieving high dye removal efficiency at low adsorbent dosage. The rigor of the study is ensured through experimentation and mechanistic interpretation of adsorption behavior.</p> Graphical abstract <p></p>

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Fast adsorption of reactive black 5 dye from aqueous solutions using a chitosan/polypyrrole composite

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Victor M. Ovando-Medina,
  • Luz Paola Martínez Castillo

摘要

Textile wastewater containing dyes poses significant environmental concerns and represents a necessity for treatment, as untreated effluents pose serious risks to aquatic organisms and ecosystem health, particularly when conventional adsorbents exhibit slow uptake and limited efficiency. Here, a chitosan/polypyrrole (Chit/PPy) composite is proposed as an effective solution, enabling rapid adsorption of reactive black 5. Pyrrole was polymerized in aqueous solution with ammonium persulfate as the oxidant in the presence of chitosan to obtain the Chit/PPy composite. The composite consisted of chitosan coated with spherical polypyrrole nanoparticles of 100 nm in diameter and polydispersity index in sizes of 1.1. Batch adsorption experiments showed rapid RB-5 dye uptake, with more than two-thirds of the dye removed after 15 min and almost full decolorization at equilibrium. Kinetic studies demonstrated that the adsorption process was described by the pseudo-second order model, indicating a chemisorption mechanism, whereas at higher concentrations, intraparticle diffusion contributed to mass transfer. The equilibrium adsorption capacities (qe) increased with initial dye concentration, reaching 145.9 mg/g. At higher adsorbent loadings, the equilibrium is reached faster. For an adsorbent dosage of 0.005 g, the observed qe was 338.6 mg/g according to the pseudo-second order model. These findings highlight the synergistic effect of chitosan and PPy in promoting fast adsorption, showing that Chit/PPy is a cost-effective adsorbent for textile wastewater treatment. The innovation of this work is fast adsorption kinetics, achieving high dye removal efficiency at low adsorbent dosage. The rigor of the study is ensured through experimentation and mechanistic interpretation of adsorption behavior.

Graphical abstract