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<p>This study investigates the efficiency of graphene oxide nickel ferrite (GO-NiFe<sub>2</sub>O<sub>4</sub>) nanocomposites for removing acid orange 7 (AO7) dye and aniline (B-NH<sub>2</sub>) from aqueous solutions. Initially, GO was synthesized from graphite powder using Tour’s method. Subsequently, GO-NiFe<sub>2</sub>O<sub>4</sub> nanocomposites were prepared via co-precipitation and hydrothermal methods. The synthesized materials go through comprehensive characterization using SEM, EDX, XRD, FT-IR spectroscopy, BET, and TGA analysis. The pH of point of zero charge (pHpzc) for GO was determined to be 6, while for GO-NiFe<sub>2</sub>O<sub>4</sub> nanocomposites, it was found to be 7.2 using the salt addition method. The adsorption of AO7 and B-NH<sub>2</sub> onto GO-NiFe<sub>2</sub>O<sub>4</sub> nanocomposites was studied under various experimental conditions: solution pH, adsorbent dose, contact time, initial concentration, temperature, and in the presence of electrolytes. Kinetic studies revealed that the pseudo-second-order model provided the best fit for both AO7 and B-NH<sub>2</sub> adsorption processes, with correlation coefficients exceeding 0.99. Equilibrium data were well-described by the Langmuir isotherm model, showing maximum monolayer adsorption capacities (<i>q</i><sub>m</sub>) of 344.8&#xa0;mg&#xa0;g<sup>−1</sup> for AO7 and 294.1&#xa0;mg&#xa0;g<sup>−1</sup> for B-NH<sub>2</sub>. Thermodynamic analysis indicated that the adsorption of AO7 was endothermic (<i>∆H</i><sup>0</sup> &gt; 0), while B-NH<sub>2</sub> adsorption was exothermic (<i>∆H</i><sup>0</sup> &lt; 0). Negative <i>∆G</i><sup>0</sup> values and positive <i>∆S</i><sup>0</sup> values confirmed the spontaneity and increased disorderliness of the adsorption processes. Furthermore, the GO-NiFe<sub>2</sub>O<sub>4</sub> nanocomposites demonstrated effective regeneration and reusability over five consecutive cycles, highlighting their potential as efficient adsorbents for AO7 and B-NH<sub>2</sub> removal from wastewater.</p>

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Comparative removal of acid orange 7 and aniline onto mesoporous graphene oxide-nickel ferrite magnetic nanocomposites in batch adsorption and application of conventional kinetic and isotherm models

  • 期刊论文

  • 发表日期：

    2025年3月26日

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  • Abid Ullah,
  • Tahira Mahmood,
  • Rahmat Ali,
  • Saima Momin

摘要

This study investigates the efficiency of graphene oxide nickel ferrite (GO-NiFe2O4) nanocomposites for removing acid orange 7 (AO7) dye and aniline (B-NH2) from aqueous solutions. Initially, GO was synthesized from graphite powder using Tour’s method. Subsequently, GO-NiFe2O4 nanocomposites were prepared via co-precipitation and hydrothermal methods. The synthesized materials go through comprehensive characterization using SEM, EDX, XRD, FT-IR spectroscopy, BET, and TGA analysis. The pH of point of zero charge (pHpzc) for GO was determined to be 6, while for GO-NiFe2O4 nanocomposites, it was found to be 7.2 using the salt addition method. The adsorption of AO7 and B-NH2 onto GO-NiFe2O4 nanocomposites was studied under various experimental conditions: solution pH, adsorbent dose, contact time, initial concentration, temperature, and in the presence of electrolytes. Kinetic studies revealed that the pseudo-second-order model provided the best fit for both AO7 and B-NH2 adsorption processes, with correlation coefficients exceeding 0.99. Equilibrium data were well-described by the Langmuir isotherm model, showing maximum monolayer adsorption capacities (qm) of 344.8 mg g−1 for AO7 and 294.1 mg g−1 for B-NH2. Thermodynamic analysis indicated that the adsorption of AO7 was endothermic (∆H0 > 0), while B-NH2 adsorption was exothermic (∆H0 < 0). Negative ∆G0 values and positive ∆S0 values confirmed the spontaneity and increased disorderliness of the adsorption processes. Furthermore, the GO-NiFe2O4 nanocomposites demonstrated effective regeneration and reusability over five consecutive cycles, highlighting their potential as efficient adsorbents for AO7 and B-NH2 removal from wastewater.