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<p>Heavy metal contaminants have attracted widespread attention due to their severe toxicity and bioaccumulation. In this study, a novel graphene (EG)/molybdenum disulfide (MoS<sub>2</sub>) modified with poly (acrylic acid) (PAA) composites (EG/MoS<sub>2</sub>/PAA) were successfully synthesized via a one-step hydrothermal method and effectively removed Pb(II)<sub>,</sub> Zn(II)<sub>,</sub> and Cd(II) ions from wastewater. The incorporation of PAA within the EG/MoS<sub>2</sub> significantly improved sorption ability. The EG/MoS<sub>2</sub>/PAA composite was characterized using XRD, FTIR, TEM, Raman, SEM–EDS, EIS, and cyclic voltammetry, which confirmed the successful synthesis of the EG/MoS<sub>2</sub>/PAA composite. The adsorption isotherm and kinetic of Pb(II), Zn(II), and Cd(II) were fitted with the Temkin isotherm and pseudo-second-order model, respectively. The maximum adsorption capacities (q<sub>max</sub>) obtained using the Langmuir model were 47.13&#xa0;mg/g for Pb(II) at pH 5, while 12.59 and 12.89&#xa0;mg/g for Zn(II) and Cd(II) at pH 7. In the presence of interfering cations (i.e., Na<sup>+</sup>, Cu<sup>2+</sup>, Co<sup>2+</sup>, Fe<sup>3+</sup>,&#xa0;and Mg<sup>2+</sup>), the EG/MoS<sub>2</sub>/PAA adsorbent exhibited high selectivity and excellent reusability after three cycles. The adsorption mechanism of Pb(II), Zn(II), and Cd(II) onto the EG/MoS<sub>2</sub>/PAA composite surface was found to be primarily controlled by complexation and electrostatic interaction. This novel EG/MoS<sub>2</sub>/PAA adsorbent has excellent suitability for practical application in the treatment of highly contaminated wastewater.</p>

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Synthesis of poly (acrylic acid) modified graphene/MoS2 heterostructure-based composite: an effective removal of Pb(II), Cd(II) and Zn(II) from wastewater

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  • 发表日期：

    2025年4月5日

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  • Salami Hammed Olawale,
  • Waleed Alahmad,
  • Ibrahim A. Darwish,
  • Mohamed Aly Saad Aly,
  • Mohammad Ashfaq,
  • Charoenkwan Kraiya

摘要

Heavy metal contaminants have attracted widespread attention due to their severe toxicity and bioaccumulation. In this study, a novel graphene (EG)/molybdenum disulfide (MoS2) modified with poly (acrylic acid) (PAA) composites (EG/MoS2/PAA) were successfully synthesized via a one-step hydrothermal method and effectively removed Pb(II), Zn(II), and Cd(II) ions from wastewater. The incorporation of PAA within the EG/MoS2 significantly improved sorption ability. The EG/MoS2/PAA composite was characterized using XRD, FTIR, TEM, Raman, SEM–EDS, EIS, and cyclic voltammetry, which confirmed the successful synthesis of the EG/MoS2/PAA composite. The adsorption isotherm and kinetic of Pb(II), Zn(II), and Cd(II) were fitted with the Temkin isotherm and pseudo-second-order model, respectively. The maximum adsorption capacities (qmax) obtained using the Langmuir model were 47.13 mg/g for Pb(II) at pH 5, while 12.59 and 12.89 mg/g for Zn(II) and Cd(II) at pH 7. In the presence of interfering cations (i.e., Na+, Cu2+, Co2+, Fe3+, and Mg2+), the EG/MoS2/PAA adsorbent exhibited high selectivity and excellent reusability after three cycles. The adsorption mechanism of Pb(II), Zn(II), and Cd(II) onto the EG/MoS2/PAA composite surface was found to be primarily controlled by complexation and electrostatic interaction. This novel EG/MoS2/PAA adsorbent has excellent suitability for practical application in the treatment of highly contaminated wastewater.