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A comprehensive study on the structural and adsorption capabilities of Ni3-xMnxAl(OH)8(CO3)0.5·yH2O (Ni-Mn-Al) layered double hydroxides (LDHs) for fluoride removal from aqueous solutions is presented. The LDHs were synthesized via co-precipitation, maintaining a 3:1 molar ratio of divalent to trivalent cations and a pH of 10. XRD analysis confirmed the formation of pure LDH phases with basal spacings ranging from 7.66 to 7.72 Å. The plate-like Mn-doped Ni–Al LDH structure exhibited multiple superimposed nanosheets. Energy-dispersive X-ray and X-ray photoelectron spectroscopies verified the successful incorporation of Mn2+ into the Ni–Al LDH structure. Batch adsorption experiments were conducted to evaluate fluoride retention on Ni-Mn-Al LDHs. Kinetic modeling revealed that fluoride adsorption followed the pseudo-second-order model, indicating favorable adsorption kinetics. The Temkin equation accurately described the equilibrium adsorption behavior. The Langmuir adsorption isotherm predicted a maximum adsorption capacity of 162.84 mg/g. Thermodynamic studies indicated that fluoride adsorption on Ni-Mn-Al LDHs is exothermic and spontaneous. These findings demonstrate the potential of mesoporous Ni-Mn-Al LDHs as efficient adsorbents for fluoride removal from aqueous media, offering promising applications in water treatment and environmental remediation.

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Mesoporous Ni3-xMnxAl(OH)8(CO3)0.5•yH2O Layered Double Hydroxide for Efficient Fluoride Capture from Aqueous Media

  • 会议论文

  • 发表日期：

    2025年

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  • Wagassa,
  • Zereffa,
  • Shifa,
  • Bansiwal,
  • Tufa,
  • Lee

摘要

A comprehensive study on the structural and adsorption capabilities of Ni3-xMnxAl(OH)8(CO3)0.5·yH2O (Ni-Mn-Al) layered double hydroxides (LDHs) for fluoride removal from aqueous solutions is presented. The LDHs were synthesized via co-precipitation, maintaining a 3:1 molar ratio of divalent to trivalent cations and a pH of 10. XRD analysis confirmed the formation of pure LDH phases with basal spacings ranging from 7.66 to 7.72 Å. The plate-like Mn-doped Ni–Al LDH structure exhibited multiple superimposed nanosheets. Energy-dispersive X-ray and X-ray photoelectron spectroscopies verified the successful incorporation of Mn2+ into the Ni–Al LDH structure. Batch adsorption experiments were conducted to evaluate fluoride retention on Ni-Mn-Al LDHs. Kinetic modeling revealed that fluoride adsorption followed the pseudo-second-order model, indicating favorable adsorption kinetics. The Temkin equation accurately described the equilibrium adsorption behavior. The Langmuir adsorption isotherm predicted a maximum adsorption capacity of 162.84 mg/g. Thermodynamic studies indicated that fluoride adsorption on Ni-Mn-Al LDHs is exothermic and spontaneous. These findings demonstrate the potential of mesoporous Ni-Mn-Al LDHs as efficient adsorbents for fluoride removal from aqueous media, offering promising applications in water treatment and environmental remediation.