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<p>The manufacture of nanoparticles by green methods has gained substantial attention in the recent years. Green nano particles possess diverse properties such as sustainability, biocompatibility and non-toxicity, making them superior to their commercial counterparts. The present study aims to synthesize green ZnO nanoparticles (ZnO—NPs) from <i>Hibiscus rosa sinensis</i> and to assess its ability to adsorb Congo Red (CR) dye from aqueous solutions. A comparison of the performance with commercial counterpart in terms of dye adsorption and antibacterial potential is also attempted. Structural and morphological features of the synthesized product were analyzed using Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD). In batch adsorption studies, highest removal efficiency was found to be 97.5% and 85% for commercial and green synthesized ZnO NPs respectively at optimum conditions of adsorbent dosage, pH and contact time. The adsorption process analyzed using Freundlich adsorption model, Halsay adsorption isotherm model and Pseudo-second-order reaction kinetics confirm heterogeneous pore distribution for both types of nanoparticles as well as chemisorption. Antibacterial property against gram negative bacteria (<i>E-coli</i>) has been confirmed for both the commercial and green synthesized ZnO, with minimum inhibitory concentrations of 2.5&#xa0;mg/ml and 5&#xa0;mg/ml respectively.</p>

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Investigations on the adsorption efficiency and antibacterial behavior of green synthesized ZnO Nanoparticles

  • 期刊论文

  • 发表日期：

    2025年11月24日

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  • Anjali T. Pillai,
  • Sumi S

摘要

The manufacture of nanoparticles by green methods has gained substantial attention in the recent years. Green nano particles possess diverse properties such as sustainability, biocompatibility and non-toxicity, making them superior to their commercial counterparts. The present study aims to synthesize green ZnO nanoparticles (ZnO—NPs) from Hibiscus rosa sinensis and to assess its ability to adsorb Congo Red (CR) dye from aqueous solutions. A comparison of the performance with commercial counterpart in terms of dye adsorption and antibacterial potential is also attempted. Structural and morphological features of the synthesized product were analyzed using Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD). In batch adsorption studies, highest removal efficiency was found to be 97.5% and 85% for commercial and green synthesized ZnO NPs respectively at optimum conditions of adsorbent dosage, pH and contact time. The adsorption process analyzed using Freundlich adsorption model, Halsay adsorption isotherm model and Pseudo-second-order reaction kinetics confirm heterogeneous pore distribution for both types of nanoparticles as well as chemisorption. Antibacterial property against gram negative bacteria (E-coli) has been confirmed for both the commercial and green synthesized ZnO, with minimum inhibitory concentrations of 2.5 mg/ml and 5 mg/ml respectively.