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<p>Alundum was integrated into hausmannite to synthesize a nano bimetallic oxide adsorbent Mn<sub>2.7</sub>Al<sub>0.3</sub>O<sub>4,</sub> for exploring its synergistic effect on the adsorption of carcinogenic ions. The characterization of Mn<sub>2.7</sub>Al<sub>0.3</sub>O<sub>4</sub> revealed that the powder X-ray diffractogram confirmed the tetragonal structure corresponding to JCPDS No. 24–0734, and a platelet shape from the scanning electron microscopy (SEM) images. The Brunauer-Emmett-Teller (BET) studies disclosed a Type-IV isotherm with a H<sub>3</sub> hysteresis loop, indicating a mesoporous structure of 1.968 m<sup>2</sup>/g surface area and 35.8 nm average pore diameter. The uptake mechanism of the carcinogenic ions onto the Mn<sub>2.7</sub>Al<sub>0.3</sub>O<sub>4</sub> surface pronounced that adsorption followed pseudo-second-order kinetics. The adsorption capacity for Cd(II) ions was 174.6 mg/g and 75.4 mg/g for Pb(II) ions from the best fit Langmuir and the Sips models, which were authenticated by R<sup>2</sup>, RSS,ARE, and χ<sup>2</sup>&#xa0;of the statistical functions, and close to the experimental results. The thermodynamic investigations announced that Cd (II) and Pb (II) ions adsorption was a spontaneous and exothermic process with a free energy change of -5.4 kJ ̸mol and ̶̶ 0.193 kJ/mol at 303 K. High adsorption capacity and easy recovery of adsorbent implied to use it for the carcinogenic ions adsorption in any aqueous stream.</p>

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Nonlinear kinetics, isotherms, and thermodynamic approach in the carcinogenic ions elimination by Mn2.7Al0.3O4 sorbent

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  • 发表日期：

    2025年12月5日

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  • Lakshmi Narayani .R,
  • Malathi Challa,
  • Archna Narula,
  • P.R Deepthi

摘要

Alundum was integrated into hausmannite to synthesize a nano bimetallic oxide adsorbent Mn2.7Al0.3O4, for exploring its synergistic effect on the adsorption of carcinogenic ions. The characterization of Mn2.7Al0.3O4 revealed that the powder X-ray diffractogram confirmed the tetragonal structure corresponding to JCPDS No. 24–0734, and a platelet shape from the scanning electron microscopy (SEM) images. The Brunauer-Emmett-Teller (BET) studies disclosed a Type-IV isotherm with a H3 hysteresis loop, indicating a mesoporous structure of 1.968 m2/g surface area and 35.8 nm average pore diameter. The uptake mechanism of the carcinogenic ions onto the Mn2.7Al0.3O4 surface pronounced that adsorption followed pseudo-second-order kinetics. The adsorption capacity for Cd(II) ions was 174.6 mg/g and 75.4 mg/g for Pb(II) ions from the best fit Langmuir and the Sips models, which were authenticated by R2, RSS,ARE, and χ2 of the statistical functions, and close to the experimental results. The thermodynamic investigations announced that Cd (II) and Pb (II) ions adsorption was a spontaneous and exothermic process with a free energy change of -5.4 kJ ̸mol and ̶̶ 0.193 kJ/mol at 303 K. High adsorption capacity and easy recovery of adsorbent implied to use it for the carcinogenic ions adsorption in any aqueous stream.