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<p>T his study explores the preparation and application of chitosan/glycerol films for the removal of Reactive Black 5 (RB5) textile dye from aqueous solutions. Chitosan, derived from red crab shells (<i>Chaceon notialis</i>) and exhibiting a high deacetylation degree (around 97%) and a molar mass of 125&#xa0;kDa, was used to produce films via the casting method. These films demonstrated low solubility in distilled water (approximately 20% after 24&#xa0;h) and tunable mechanical properties, with tensile strength ranging from 10.58 to 42.15&#xa0;MPa (inversely proportional to plasticizer content) and elongation at break from 2.94 to 43.05% (directly proportional to chitosan concentration). Adsorption studies revealed a maximum adsorption capacity of 389.47&#xa0;mg.g<sup>−1</sup>, with the Langmuir isotherm (<i>R</i><sup>2</sup> &gt; 0.94; adj-<i>R</i><sup>2</sup> &gt; 0.88) best describing the equilibrium data. Kinetic analysis, specifically with the pseudo-first-order model (<i>R</i><sup>2</sup> &gt; 0.99), indicated that the film reaches 74.8% saturation after 2&#xa0;h of adsorption. Furthermore, thermodynamic investigations demonstrated that the adsorption process is spontaneous and favorable across the studied temperature range (298 to 318&#xa0;K), with Gibbs free energy (Δ<i>G</i>) values ranging from − 22.86 to − 23.97&#xa0;kJ.mol<sup>−1</sup>.</p>

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Valorization of red crab shell waste into chitosan films for enhanced Reactive Black 5 adsorption

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Calebe Hebrom Livistom Silva,
  • Marcelo Godoi,
  • Meritaine da Rocha

摘要

T his study explores the preparation and application of chitosan/glycerol films for the removal of Reactive Black 5 (RB5) textile dye from aqueous solutions. Chitosan, derived from red crab shells (Chaceon notialis) and exhibiting a high deacetylation degree (around 97%) and a molar mass of 125 kDa, was used to produce films via the casting method. These films demonstrated low solubility in distilled water (approximately 20% after 24 h) and tunable mechanical properties, with tensile strength ranging from 10.58 to 42.15 MPa (inversely proportional to plasticizer content) and elongation at break from 2.94 to 43.05% (directly proportional to chitosan concentration). Adsorption studies revealed a maximum adsorption capacity of 389.47 mg.g−1, with the Langmuir isotherm (R2 > 0.94; adj-R2 > 0.88) best describing the equilibrium data. Kinetic analysis, specifically with the pseudo-first-order model (R2 > 0.99), indicated that the film reaches 74.8% saturation after 2 h of adsorption. Furthermore, thermodynamic investigations demonstrated that the adsorption process is spontaneous and favorable across the studied temperature range (298 to 318 K), with Gibbs free energy (ΔG) values ranging from − 22.86 to − 23.97 kJ.mol−1.