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<p>Heavy metals have a substantial environmental impact for their toxic, carcinogenic, and non-biodegradable nature. Heavy metal contaminants have serious health consequences for both humans and the aquatic environment. Therefore, effective and eco-friendly methods of removal, like nanotechnology, are needed right away to stop heavy metal pollution. In this study, algal-based cellulose nanofibers (A-CNF) were extracted from <i>Sargassum wightii</i>. The synthesized A-CNF was characterized by FTIR, XRD, FESEM-EDS, TEM, DSC, zeta potential, and BET. The extracted material was found crystalline in nature (85%), and the crystallite size and inter-planer distance of A-CNF were observed 4.86&#xa0;nm and 2.78&#xa0;nm respectively. The SEM image shows defibrillated fiber-like structures. A-CNF is a mesoporous material with an average pore diameter of 2.41&#xa0;nm. The best Cr (III) and Cd (II) sorption efficiencies were observed 67% and 65% at pH 7. PSO and IPD kinetic models are best-fitted (<i>R</i><sup>2</sup> ≥ 0.95) for Cr adsorption. For Cr sorption, the Elovich isotherm model is a best-fitted model (<i>R</i><sup>2</sup> ≥ 0.95), and the best-fitted models for Cd sorption include Langmuir, Freundlich, Temkin, and Redlich-Peterson (<i>R</i><sup>2</sup> ≥ 0.95). The thermodynamic investigation showed that Cr and Cd ion adsorptions were endothermic and exothermic. Negative Gibbs free energy confirms spontaneous Cr and Cd ion sorptions. The reusability of A-CNF is up to four cycles prior to disposal.</p>

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Remediation of Chromium (III) and Cadmium (II) from the Aqueous Media by Algal-based Nanocellulose (A-CNF)

  • 期刊论文

  • 发表日期：

    2025年2月13日

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  • Sumeet Kumar,
  • Monika Yadav,
  • Pooja Rani,
  • Sahil,
  • Jitender Pal

摘要

Heavy metals have a substantial environmental impact for their toxic, carcinogenic, and non-biodegradable nature. Heavy metal contaminants have serious health consequences for both humans and the aquatic environment. Therefore, effective and eco-friendly methods of removal, like nanotechnology, are needed right away to stop heavy metal pollution. In this study, algal-based cellulose nanofibers (A-CNF) were extracted from Sargassum wightii. The synthesized A-CNF was characterized by FTIR, XRD, FESEM-EDS, TEM, DSC, zeta potential, and BET. The extracted material was found crystalline in nature (85%), and the crystallite size and inter-planer distance of A-CNF were observed 4.86 nm and 2.78 nm respectively. The SEM image shows defibrillated fiber-like structures. A-CNF is a mesoporous material with an average pore diameter of 2.41 nm. The best Cr (III) and Cd (II) sorption efficiencies were observed 67% and 65% at pH 7. PSO and IPD kinetic models are best-fitted (R2 ≥ 0.95) for Cr adsorption. For Cr sorption, the Elovich isotherm model is a best-fitted model (R2 ≥ 0.95), and the best-fitted models for Cd sorption include Langmuir, Freundlich, Temkin, and Redlich-Peterson (R2 ≥ 0.95). The thermodynamic investigation showed that Cr and Cd ion adsorptions were endothermic and exothermic. Negative Gibbs free energy confirms spontaneous Cr and Cd ion sorptions. The reusability of A-CNF is up to four cycles prior to disposal.