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<p>In recent years, biogenic nanoparticles have attracted considerable attention as efficient adsorbents for removing pollutants from industrial wastewater, owing to their small size, low toxicity, cost-effectiveness, and environmentally friendly nature. In this study, copper oxide nanoparticles (CuO–NPs) synthesized by the psychrotolerant Microbacterium sp. were employed for the removal of two common azo dyes, Reactive Red 24 (RR24) and Acid Orange 7 (AO7). The biogenic nanoparticles were characterized using UV–Vis Spectroscopy, FTIR, Zeta Potential, XRD, SEM, EDS, and AFM. The average size of these nanoparticles was 63.21&#xa0;nm, with a PDI value of 0.27, indicating a relatively uniform size distribution of CuO–NPs. EDS analysis revealed that the highest weight percentages of O and Cu were 38.32% and 35.17%, respectively. Batch biosorption experiments were conducted to evaluate the effects of pH, nanoparticle dose, dye concentration, and mixing speed. Under optimized conditions, the removal efficiency of RR24 reached 95% at an initial concentration of 20&#xa0;mg/L, pH 2, a mixing speed of 300&#xa0;rpm, and a nanoparticle dose of 80&#xa0;mg after 140&#xa0;min, whereas AO7 exhibited an 82% removal efficiency under similar conditions with a mixing speed of 500&#xa0;rpm over 80&#xa0;min. The adsorption data were well fitted by the Freundlich isotherm and pseudo-second-order kinetic model, indicating chemisorption onto heterogeneous surfaces. Overall, the results demonstrate that biogenic CuO–NPs are highly effective, cost-efficient, and environmentally sustainable adsorbents, presenting a promising alternative to conventional wastewater treatment technologies for the removal of azo dyes.</p>

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Biogenic synthesis of CuO-NPs using psychrotolerant Microbacterium sp.: an application for efficient adsorption of RR24/AO7 azo dyes

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • E. Doshvargar,
  • B. Shahnavaz,
  • M. Karrabi

摘要

In recent years, biogenic nanoparticles have attracted considerable attention as efficient adsorbents for removing pollutants from industrial wastewater, owing to their small size, low toxicity, cost-effectiveness, and environmentally friendly nature. In this study, copper oxide nanoparticles (CuO–NPs) synthesized by the psychrotolerant Microbacterium sp. were employed for the removal of two common azo dyes, Reactive Red 24 (RR24) and Acid Orange 7 (AO7). The biogenic nanoparticles were characterized using UV–Vis Spectroscopy, FTIR, Zeta Potential, XRD, SEM, EDS, and AFM. The average size of these nanoparticles was 63.21 nm, with a PDI value of 0.27, indicating a relatively uniform size distribution of CuO–NPs. EDS analysis revealed that the highest weight percentages of O and Cu were 38.32% and 35.17%, respectively. Batch biosorption experiments were conducted to evaluate the effects of pH, nanoparticle dose, dye concentration, and mixing speed. Under optimized conditions, the removal efficiency of RR24 reached 95% at an initial concentration of 20 mg/L, pH 2, a mixing speed of 300 rpm, and a nanoparticle dose of 80 mg after 140 min, whereas AO7 exhibited an 82% removal efficiency under similar conditions with a mixing speed of 500 rpm over 80 min. The adsorption data were well fitted by the Freundlich isotherm and pseudo-second-order kinetic model, indicating chemisorption onto heterogeneous surfaces. Overall, the results demonstrate that biogenic CuO–NPs are highly effective, cost-efficient, and environmentally sustainable adsorbents, presenting a promising alternative to conventional wastewater treatment technologies for the removal of azo dyes.