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<p>A simple in-situ chemical polymerization technique was applied to develop arginine functionalized-PPy/graphitic carbon nitride composite (Arg-PPy/g-C<sub>3</sub>N<sub>4</sub>) for the elimination of Cr(VI) ions. Various analytical methods, including scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDS), Raman spectroscopy, X-ray diffraction (XRD), N<sub>2</sub> adsorption-desorption and transforms infrared (FT-IR) spectroscopy. were employed to explore the morphology, structural and crystallinity features of Arg-PPy/g-C<sub>3</sub>N<sub>4</sub> composite. The observations suggest a well-organized arrangement of Arg-PPy chains on g-C<sub>3</sub>N<sub>4</sub>, forming a uniform Arg-PPy matrix coating. This structural configuration increases the density of nitrogen-rich functional moieties, thereby improving the nanocomposite’s performance in Cr(VI) removal from water. The uptake performance of Arg-PPy/g-C<sub>3</sub>N<sub>4</sub> for Cr(VI) was systematically studied as a function of various operational parameters. At pH 2, 98.9% of Cr(VI) was removed using 0.5&#xa0;g.L<sup>− 1</sup> of adsorbent within 60&#xa0;min. The highest uptake capacity was 104.07 mg.g<sup>− 1</sup>, and both Freundlich isotherm and pseudo 2nd order (PSO) models aligned well with the adsorption experimental findings for Cr(VI) species. An assessment of coexisting ions (Cl<sup>−</sup>, NO<sub>3</sub><sup>−</sup>, CO<sub>3</sub><sup>2−</sup>, and SO<sub>4</sub><sup>2−</sup>) showed that Cr(VI) adsorption remained effective despite competition. Based on the evaluated thermodynamic variables, Cr(VI) adsorption under the investigated conditions was exothermic and spontaneous. The Cr(VI) removal efficiency of Arg-PPy/g-C<sub>3</sub>N<sub>4</sub> is still above 89% after four regeneration times. Overall, the Arg-PPy/g-C<sub>3</sub>N<sub>4</sub> composite shows potential for Cr(VI) detoxification from water.</p>

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Ultrahigh Cr(VI) Detoxification from Aqueous Media Utilizing Arginine-Polypyrrole Coated Graphitic-C3N4 Composite

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Hamid Zouggari,
  • Fatima-Zahra Mahir,
  • Abdelaziz Imgharn,
  • Kamal Ait El Bacha,
  • Abdelghani Hsini,
  • Nouh Aarab,
  • Mohamed Laabd,
  • Habiba El Jazouli,
  • Rajae Lakhmiri,
  • Lahcen Bazzi,
  • Abdallah Albourine

摘要

A simple in-situ chemical polymerization technique was applied to develop arginine functionalized-PPy/graphitic carbon nitride composite (Arg-PPy/g-C3N4) for the elimination of Cr(VI) ions. Various analytical methods, including scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDS), Raman spectroscopy, X-ray diffraction (XRD), N2 adsorption-desorption and transforms infrared (FT-IR) spectroscopy. were employed to explore the morphology, structural and crystallinity features of Arg-PPy/g-C3N4 composite. The observations suggest a well-organized arrangement of Arg-PPy chains on g-C3N4, forming a uniform Arg-PPy matrix coating. This structural configuration increases the density of nitrogen-rich functional moieties, thereby improving the nanocomposite’s performance in Cr(VI) removal from water. The uptake performance of Arg-PPy/g-C3N4 for Cr(VI) was systematically studied as a function of various operational parameters. At pH 2, 98.9% of Cr(VI) was removed using 0.5 g.L− 1 of adsorbent within 60 min. The highest uptake capacity was 104.07 mg.g− 1, and both Freundlich isotherm and pseudo 2nd order (PSO) models aligned well with the adsorption experimental findings for Cr(VI) species. An assessment of coexisting ions (Cl−, NO3−, CO32−, and SO42−) showed that Cr(VI) adsorption remained effective despite competition. Based on the evaluated thermodynamic variables, Cr(VI) adsorption under the investigated conditions was exothermic and spontaneous. The Cr(VI) removal efficiency of Arg-PPy/g-C3N4 is still above 89% after four regeneration times. Overall, the Arg-PPy/g-C3N4 composite shows potential for Cr(VI) detoxification from water.