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<p>With water pollution surging at an alarming rate; an economical and sustainable material is warranted for mitigation of anthropogenic toxins. Herein, a nanocomposite hydrogel composed of CuO nanoparticles (NPs) embedded in chitosan-formaldehyde (CsF) Schiff base hydrogel was explored as a catalyst towards the reduction of environmental pollutants. Green synthesis of CuO NPs was accomplished from watermelon rind extract. Spherical CuO NPs having an average particle size of 29.8&#xa0;nm with a zeta potential of − 23.1&#xa0;mV was obtained. The CuO NPs-integrated CsF hydrogel demonstrated good catalytic reduction of pollutants like 4-nitrophenol (4-NP), K<sub>3</sub>[Fe(CN)<sub>6</sub>], rhodamine B (RhB) and methyl orange (MO) in the presence of NaBH<sub>4</sub>. The influence of different parameters on the catalytic activity and the kinetics was assessed. The apparent rate constant for reduction reaction of 4-NP, K<sub>3</sub>[Fe(CN)<sub>6</sub>], RhB and MO by the hydrogel was estimated to be 0.025&#xa0;s<sup>–1</sup>, 0.016&#xa0;s<sup>–1</sup>, 0.135&#xa0;s<sup>–1</sup> and 0.099&#xa0;s<sup>–1</sup> respectively. The hydrogel depicted a recyclability of four stable cycles. Our study paves the path for the development of a sustainable hydrogel catalyst for reduction of hazardous anthropogenic pollutants in wastewater treatment.</p> Graphical abstract <p></p>

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Green CuO nanoparticle-chitosan Schiff base hydrogel composite for efficient catalytic reduction of anthropogenic water toxins

  • 期刊论文

  • 发表日期：

    2025年1月7日

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  • Ganeswar Dalei,
  • Subhraseema Das,
  • Achyuta Nanda Acharya

摘要

With water pollution surging at an alarming rate; an economical and sustainable material is warranted for mitigation of anthropogenic toxins. Herein, a nanocomposite hydrogel composed of CuO nanoparticles (NPs) embedded in chitosan-formaldehyde (CsF) Schiff base hydrogel was explored as a catalyst towards the reduction of environmental pollutants. Green synthesis of CuO NPs was accomplished from watermelon rind extract. Spherical CuO NPs having an average particle size of 29.8 nm with a zeta potential of − 23.1 mV was obtained. The CuO NPs-integrated CsF hydrogel demonstrated good catalytic reduction of pollutants like 4-nitrophenol (4-NP), K3[Fe(CN)6], rhodamine B (RhB) and methyl orange (MO) in the presence of NaBH4. The influence of different parameters on the catalytic activity and the kinetics was assessed. The apparent rate constant for reduction reaction of 4-NP, K3[Fe(CN)6], RhB and MO by the hydrogel was estimated to be 0.025 s–1, 0.016 s–1, 0.135 s–1 and 0.099 s–1 respectively. The hydrogel depicted a recyclability of four stable cycles. Our study paves the path for the development of a sustainable hydrogel catalyst for reduction of hazardous anthropogenic pollutants in wastewater treatment.

Graphical abstract