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<p>Here, we reported a facile and eco-friendly synthesis route of CuO, ZnO, and CuO-doped ZnO (CuO/ZnO) materials using the extract of <i>Combretum indicum</i> flower. As-synthesized CuO, ZnO and CuO/ZnO exhibited high degree of crystallinity and surface chemistry with many functional groups. Based on using Scherrer equation, the calculated crystallite sizes obeyed an order as follows: CuO (15.0 ± 3.1 nm) &lt; CuO/ZnO (23.0 ± 6.2 nm) &lt; ZnO (23.3 ± 3.2 nm). Three prepared materials were investigated to remove brilliant green dye at different temperatures (298 K, 308 K, and 318 K). Kinetic models were used to fit with experimental data. Adsorption isotherm models, such as Langmuir, Freundlich, and Temkin were also applied. The adsorption thermodynamic were studied, finding that the adsorption processes of brilliant green onto CuO, ZnO and CuO/ZnO particles were spontaneous. The proposed mechanism of the adsorption process was represented with the significant role of hydrogen bonding and π-π interaction. Finally, the regeneration study of CuO, ZnO and CuO/ZnO materials were accomplished by ethanol and distilled water, resulting in good performance with five-time recycling. Thus, <i>Combretum indicum</i> flower extract-mediated synthesis of CuO, ZnO and CuO/ZnO may be useful for efficient removal of organic dyes in aqueous solutions.</p>

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Bio-mediated synthesis of CuO, ZnO and CuO/ZnO particles using Combretum indicum flower extract for water treatment

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • N. T. T. Nguyen,
  • G. T. Tran,
  • T. T. T. Nguyen,
  • D. T. C. Nguyen,
  • T. V. Tran

摘要

Here, we reported a facile and eco-friendly synthesis route of CuO, ZnO, and CuO-doped ZnO (CuO/ZnO) materials using the extract of Combretum indicum flower. As-synthesized CuO, ZnO and CuO/ZnO exhibited high degree of crystallinity and surface chemistry with many functional groups. Based on using Scherrer equation, the calculated crystallite sizes obeyed an order as follows: CuO (15.0 ± 3.1 nm) < CuO/ZnO (23.0 ± 6.2 nm) < ZnO (23.3 ± 3.2 nm). Three prepared materials were investigated to remove brilliant green dye at different temperatures (298 K, 308 K, and 318 K). Kinetic models were used to fit with experimental data. Adsorption isotherm models, such as Langmuir, Freundlich, and Temkin were also applied. The adsorption thermodynamic were studied, finding that the adsorption processes of brilliant green onto CuO, ZnO and CuO/ZnO particles were spontaneous. The proposed mechanism of the adsorption process was represented with the significant role of hydrogen bonding and π-π interaction. Finally, the regeneration study of CuO, ZnO and CuO/ZnO materials were accomplished by ethanol and distilled water, resulting in good performance with five-time recycling. Thus, Combretum indicum flower extract-mediated synthesis of CuO, ZnO and CuO/ZnO may be useful for efficient removal of organic dyes in aqueous solutions.