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<p>A new nanocomposite was synthesized by incorporating ZnO nanoparticles on the surface of CTAB surfactant-modified bentonite. Characterization of the samples by XRD, SEM FTIR and EDX techniques confirmed the formation of nano-ZnO-Bent. The application of this nanocomposite as an adsorbent was carried out to remove malachite green dye from aqueous solution. The influence of various environmental parameters such as initial pH, temperature, adsorbent dose, contact time and initial dye concentration was studied. The optimum removal conditions were observed at natural pH (pH 7) using an adsorbent dosage of 0.008&#xa0;g at room temperature (25&#xa0;°C). A significant removal percentage of 90.23% was achieved in 60&#xa0;min at an initial concentration of 20&#xa0;mg/L. The pseudo-second-order model better described the adsorption kinetics than the pseudo-first-order model with a rate constant of 4.5.10<sup>–3</sup>&#xa0;mg.L<sup>−1</sup> min<sup>−1</sup>. However, the pseudo-second-order model does not only govern the adsorption process. The adsorption occurs in two distinct stages: a first rapid adsorption on the surface layer occurs within minutes, followed by a slower phase characterized by intraparticle diffusion. The adsorption isotherm showed that both Langmuir and Freundlich models fit well to the dye adsorption data on nano-ZnO-Bent. Therefore, the phenomenon is modeled by a single-layer adsorption with a maximum adsorption capacity of 35.5&#xa0;mg/g and a multi-layer adsorption.</p> Graphic abstract <p></p>

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Use of synthesized nanoclay as an adsorbent for elimination of malachite green from aqueous solution

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Imen Harbi,
  • Nacéra Zabat,
  • Imène Zitouni,
  • Bouchra Bounab

摘要

A new nanocomposite was synthesized by incorporating ZnO nanoparticles on the surface of CTAB surfactant-modified bentonite. Characterization of the samples by XRD, SEM FTIR and EDX techniques confirmed the formation of nano-ZnO-Bent. The application of this nanocomposite as an adsorbent was carried out to remove malachite green dye from aqueous solution. The influence of various environmental parameters such as initial pH, temperature, adsorbent dose, contact time and initial dye concentration was studied. The optimum removal conditions were observed at natural pH (pH 7) using an adsorbent dosage of 0.008 g at room temperature (25 °C). A significant removal percentage of 90.23% was achieved in 60 min at an initial concentration of 20 mg/L. The pseudo-second-order model better described the adsorption kinetics than the pseudo-first-order model with a rate constant of 4.5.10–3 mg.L−1 min−1. However, the pseudo-second-order model does not only govern the adsorption process. The adsorption occurs in two distinct stages: a first rapid adsorption on the surface layer occurs within minutes, followed by a slower phase characterized by intraparticle diffusion. The adsorption isotherm showed that both Langmuir and Freundlich models fit well to the dye adsorption data on nano-ZnO-Bent. Therefore, the phenomenon is modeled by a single-layer adsorption with a maximum adsorption capacity of 35.5 mg/g and a multi-layer adsorption.

Graphic abstract