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<p>Untreated effluents containing toxic heavy metals, even in minimal concentrations, adversely affect human health and endanger the ecosystem. Considering the critical need for sustainable remediation strategies to mitigate heavy metal pollution, this study investigates a novel green-synthesized Zinc oxide-Polyaniline nanocomposite, utilizing <i>Syzygium cumini</i> leaf extract, ZnO(SC)-PANI, for removal of Ni(II) and Pb(II) from aqueous solutions. FTIR, XRD, SEM, HRTEM and BET analyses confirmed successful synthesis, revealing semi-crystalline structure, two distinct phases with white irregularly shaped ZnO(SC) particles in PANI matrix and high specific surface area (54.812 m<sup>2</sup>g<sup>−1</sup>) with suitable pore volume (0.3599 cm<sup>3</sup>g<sup>−1</sup>). Maximum adsorption capacity for Ni(II) was 113.8&#xa0;mg&#xa0;g<sup>−1</sup> after 30&#xa0;min of contact time, under optimized conditions of pH 6, temperature 25&#xa0;°C, initial metal concentration 10&#xa0;mg L<sup>−1</sup>, and adsorbent dose 0.4&#xa0;g L<sup>−1</sup>. Under the same conditions, the maximum adsorption capacity for Pb(II) was 99.90&#xa0;mg&#xa0;g<sup>−1</sup>, achieved after 60&#xa0;min of contact time. Langmuir isotherm and pseudo-second order kinetics best fit the data for both metal ions. The process was spontaneous and efficient, with good recyclability over 8 cycles. These finding demonstrate the potential of ZnO(SC)-PANI nanocomposite as a cost-effective, sustainable adsorbent for removing Ni(II)&#xa0;and Pb(II) from industrial wastewater.</p> Graphical Abstract <p></p>

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Green Synthesis of ZnO-Polyaniline Nanocomposite using Syzygium cumini Leaf Extract for Ni(II) and Pb(II) Removal from Aqueous Solutions: A Comprehensive Study

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Divya Bhushan,
  • Renuka Gupta

摘要

Untreated effluents containing toxic heavy metals, even in minimal concentrations, adversely affect human health and endanger the ecosystem. Considering the critical need for sustainable remediation strategies to mitigate heavy metal pollution, this study investigates a novel green-synthesized Zinc oxide-Polyaniline nanocomposite, utilizing Syzygium cumini leaf extract, ZnO(SC)-PANI, for removal of Ni(II) and Pb(II) from aqueous solutions. FTIR, XRD, SEM, HRTEM and BET analyses confirmed successful synthesis, revealing semi-crystalline structure, two distinct phases with white irregularly shaped ZnO(SC) particles in PANI matrix and high specific surface area (54.812 m2g−1) with suitable pore volume (0.3599 cm3g−1). Maximum adsorption capacity for Ni(II) was 113.8 mg g−1 after 30 min of contact time, under optimized conditions of pH 6, temperature 25 °C, initial metal concentration 10 mg L−1, and adsorbent dose 0.4 g L−1. Under the same conditions, the maximum adsorption capacity for Pb(II) was 99.90 mg g−1, achieved after 60 min of contact time. Langmuir isotherm and pseudo-second order kinetics best fit the data for both metal ions. The process was spontaneous and efficient, with good recyclability over 8 cycles. These finding demonstrate the potential of ZnO(SC)-PANI nanocomposite as a cost-effective, sustainable adsorbent for removing Ni(II) and Pb(II) from industrial wastewater.

Graphical Abstract