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<p>The necessity of removing dyes from wastewater arises from their detrimental impacts on both the environment and human health. The intricate structures of dye molecules complicate their removal, highlighting the need for effective treatment methods. Among the various available techniques, adsorption has emerged as a particularly efficient strategy for eliminating dye contaminants. Hydroxyapatite (HAp), a biomaterial recognized for its distinctive properties and interaction mechanisms, has been identified as a suitable adsorbent for effectively capturing toxic dyes from wastewater. This research centers on the adsorption of indigo carmine, a hazardous dye, onto synthetic HAp. The study systematically varied critical parameters, including contact time, pH of the medium, and initial dye concentration, using a batch adsorption approach. These parameters were selected due to their significant influence on the adsorption process: pH affects the ionization states of both the dye and HAp, while the mass of the adsorbent and the duration of contact determine the availability of binding sites and the extent of interaction. The use of Doehlert's design facilitated the optimization of experimental conditions, allowing for precise results with fewer trials. The findings reveal that the most effective adsorption occurs at a pH of 7, with an adsorbent mass of 0.6&#xa0;g and a contact time of one hour, achieving an impressive elimination rate of 86% at higher dye concentrations. The kinetics of adsorption were best represented by the pseudo-second-order model, as indicated by high regression coefficients, suggesting a strong chemisorptive interaction. Furthermore, the Langmuir isotherm model was determined to be the most appropriate for characterizing the adsorption of indigo carmine, supported by the calculated adsorption capacities. This study underscores the potential of HAp as an effective biomaterial for dye removal, with important implications for practical applications in industrial wastewater treatment. Future research should aim to apply these findings to real wastewater samples, further establishing HAp's viability as a sustainable solution for large-scale dye remediation.</p>

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Hydroxyapatite Biomaterial for Adsorption Based Toxic Indigo Carmine Dye Removal: Optimization and Modeling

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • Nadia Boussaha,
  • Jihen Ben Slimen,
  • Mohamedou BA,
  • Mustapha Hidouri

摘要

The necessity of removing dyes from wastewater arises from their detrimental impacts on both the environment and human health. The intricate structures of dye molecules complicate their removal, highlighting the need for effective treatment methods. Among the various available techniques, adsorption has emerged as a particularly efficient strategy for eliminating dye contaminants. Hydroxyapatite (HAp), a biomaterial recognized for its distinctive properties and interaction mechanisms, has been identified as a suitable adsorbent for effectively capturing toxic dyes from wastewater. This research centers on the adsorption of indigo carmine, a hazardous dye, onto synthetic HAp. The study systematically varied critical parameters, including contact time, pH of the medium, and initial dye concentration, using a batch adsorption approach. These parameters were selected due to their significant influence on the adsorption process: pH affects the ionization states of both the dye and HAp, while the mass of the adsorbent and the duration of contact determine the availability of binding sites and the extent of interaction. The use of Doehlert's design facilitated the optimization of experimental conditions, allowing for precise results with fewer trials. The findings reveal that the most effective adsorption occurs at a pH of 7, with an adsorbent mass of 0.6 g and a contact time of one hour, achieving an impressive elimination rate of 86% at higher dye concentrations. The kinetics of adsorption were best represented by the pseudo-second-order model, as indicated by high regression coefficients, suggesting a strong chemisorptive interaction. Furthermore, the Langmuir isotherm model was determined to be the most appropriate for characterizing the adsorption of indigo carmine, supported by the calculated adsorption capacities. This study underscores the potential of HAp as an effective biomaterial for dye removal, with important implications for practical applications in industrial wastewater treatment. Future research should aim to apply these findings to real wastewater samples, further establishing HAp's viability as a sustainable solution for large-scale dye remediation.