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<p>Dyes are discharged into water streams along with industrial effluent and pollute the water bodies. These dyes are carcinogenic and mutagenic to aquatic life and human health. Thus, degradation/removal of dyes from wastewater is mandatory before discharging into water bodies. To address this problem, we reported the synthesis of cobalt nanoparticles (CoNPs) immobilized poly(methyl methacrylate-acrylic acid)-alginate [(Co-p(MAAG)] hydrogels as a catalyst for the reduction of toxic dyes present in the aqueous medium. p(MAAG) hydrogel was synthesized by free radical precipitation polymerization method while CoNPs were fabricated in a hydrogel network by in-situ reduction method. The prepared p(MAAG) hydrogel and Co-p(MAAG) nanocomposite hydrogel particles were analyzed by different techniques such as UV–visible, FTIR, FESEM, and TGA. UV-visible spectra revealed a characteristic SPR band at 390&#xa0;nm associated with CoNPs in Co-p(MAAG) nanocomposite hydrogel. FTIR analysis showed significant differences in band positions appeared due to the stretching of hydroxyl (O-H) and carbonyl (C = O) groups in Co-p(MAAG) nanocomposite hydrogels as compared to p(MAAG) hydrogels, due to the presence of CoNPs interacting with carbonyl and hydroxyl groups. TGA analysis indicates that Co-p(MAAG) nanocomposite hydrogels are thermally stable compared to the p(MAAG) hydrogels with 10.93% loaded amount of CoNPs. FESEM images showed a uniform distribution of spherical-shaped CoNPs in the hydrogel matrix. The pseudo-first-order model was applied to monitor the catalytic reduction of RhB dye due to excessive use of NaBH<sub>4</sub> as a reducing agent and value of R<sup>2</sup> found close to unity. The value of apparent rate constant (k<sub>app</sub>) and percentage reduction for RhB dye was found as 0.591&#xa0;min<sup>− 1</sup> and 96.35%, respectively while the reaction was completed in 12&#xa0;min. This study illustrates that Co-p(MAAG) nanocomposite hydrogels are cost effective catalysts and can effectively reduce the RhB dye in aqueous medium to environmental benign products in feasible time period.</p> Graphical Abstract <p></p>

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Cobalt Nanoparticles Loaded Poly(methyl methacrylate) Nanocomposite Hydrogels for the Catalytic Reduction of Rhodamine B; A Toxic Dye

  • 期刊论文

  • 发表日期：

    2025年5月11日

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  • Khalida Naseem,
  • Sajjad Haider,
  • Kamran Alam

摘要

Dyes are discharged into water streams along with industrial effluent and pollute the water bodies. These dyes are carcinogenic and mutagenic to aquatic life and human health. Thus, degradation/removal of dyes from wastewater is mandatory before discharging into water bodies. To address this problem, we reported the synthesis of cobalt nanoparticles (CoNPs) immobilized poly(methyl methacrylate-acrylic acid)-alginate [(Co-p(MAAG)] hydrogels as a catalyst for the reduction of toxic dyes present in the aqueous medium. p(MAAG) hydrogel was synthesized by free radical precipitation polymerization method while CoNPs were fabricated in a hydrogel network by in-situ reduction method. The prepared p(MAAG) hydrogel and Co-p(MAAG) nanocomposite hydrogel particles were analyzed by different techniques such as UV–visible, FTIR, FESEM, and TGA. UV-visible spectra revealed a characteristic SPR band at 390 nm associated with CoNPs in Co-p(MAAG) nanocomposite hydrogel. FTIR analysis showed significant differences in band positions appeared due to the stretching of hydroxyl (O-H) and carbonyl (C = O) groups in Co-p(MAAG) nanocomposite hydrogels as compared to p(MAAG) hydrogels, due to the presence of CoNPs interacting with carbonyl and hydroxyl groups. TGA analysis indicates that Co-p(MAAG) nanocomposite hydrogels are thermally stable compared to the p(MAAG) hydrogels with 10.93% loaded amount of CoNPs. FESEM images showed a uniform distribution of spherical-shaped CoNPs in the hydrogel matrix. The pseudo-first-order model was applied to monitor the catalytic reduction of RhB dye due to excessive use of NaBH4 as a reducing agent and value of R2 found close to unity. The value of apparent rate constant (kapp) and percentage reduction for RhB dye was found as 0.591 min− 1 and 96.35%, respectively while the reaction was completed in 12 min. This study illustrates that Co-p(MAAG) nanocomposite hydrogels are cost effective catalysts and can effectively reduce the RhB dye in aqueous medium to environmental benign products in feasible time period.

Graphical Abstract