Scholarlink

<p>Copper and nickel loaded-breadfruit seed husk nanocomposites (CuNP@BF and NiNP@BF) were synthesized using a combined chemical and biological approach for the efficient removal of Pb (II) ions from aqueous solutions. The prepared materials were characterized using BET, SEM, XRD, TGA, pHpzc and FTIR to confirm metal integration and identify functional groups involved in the adsorption process. Kinetic studies, thermodynamic analyses, and equilibrium experiments were conducted in a batch process under various conditions, including pH, contact time, initial metal ion concentration, temperature, and adsorbent dosage. Kinetic studies on the adsorption of Pb (II) ions revealed that the pseudo-second-order model provided the best fit for the experimental data. This was confirmed by the highest R² values (0.99989 and 0.99956) coupled with the lowest statistical error values obtained (0.07661 and 0.03485) for CuNP@BF and NiNP@BF, respectively. The Freundlich model best describes the equilibrium isotherm data, suggesting a multilayer adsorption onto heterogeneous surfaces. Maximum monolayer adsorption of Pb (II) ions was 18.62 and 17.17&#xa0;mg/g for CuNP@BF and NiNP@BF, respectively. Furthermore, the thermodynamic study demonstrated that adsorption is endothermic, spontaneous, and physicochemical. In addition, the high percentages of Pb (II) ions desorption, 84.5% (for CuNP@BF) and 81.5% (for NiNP@BF) after three cycles highlight the reusability and effectiveness of the nanocomposites for Pb (II) ions removal.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Pb (II) ion adsorption from solution onto biogenic-synthesized Cu-loaded and Ni-loaded breadfruit biochar: kinetic, isotherm, thermodynamic and regeneration studies

  • 期刊论文

  • 发表日期：

    2025年9月5日

查看全文
  • Helen. O Chukwuemeka-Okorie,
  • Francis.K Ekuma,
  • Ifeanyi. E Otuokere,
  • Kovo.G Akpomie

摘要

Copper and nickel loaded-breadfruit seed husk nanocomposites (CuNP@BF and NiNP@BF) were synthesized using a combined chemical and biological approach for the efficient removal of Pb (II) ions from aqueous solutions. The prepared materials were characterized using BET, SEM, XRD, TGA, pHpzc and FTIR to confirm metal integration and identify functional groups involved in the adsorption process. Kinetic studies, thermodynamic analyses, and equilibrium experiments were conducted in a batch process under various conditions, including pH, contact time, initial metal ion concentration, temperature, and adsorbent dosage. Kinetic studies on the adsorption of Pb (II) ions revealed that the pseudo-second-order model provided the best fit for the experimental data. This was confirmed by the highest R² values (0.99989 and 0.99956) coupled with the lowest statistical error values obtained (0.07661 and 0.03485) for CuNP@BF and NiNP@BF, respectively. The Freundlich model best describes the equilibrium isotherm data, suggesting a multilayer adsorption onto heterogeneous surfaces. Maximum monolayer adsorption of Pb (II) ions was 18.62 and 17.17 mg/g for CuNP@BF and NiNP@BF, respectively. Furthermore, the thermodynamic study demonstrated that adsorption is endothermic, spontaneous, and physicochemical. In addition, the high percentages of Pb (II) ions desorption, 84.5% (for CuNP@BF) and 81.5% (for NiNP@BF) after three cycles highlight the reusability and effectiveness of the nanocomposites for Pb (II) ions removal.