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<p>Nowadays, developing an effective method for fast and selective removal of metal ions is highly desired. The preparations of nickel molybdate, manganese molybdate, and cobalt molybdate using simple template-free methods were described in this work, and their results for removal of three heavy metals ions including Pb<sup>2+</sup>, Zn<sup>2+</sup> and Cd<sup>2+</sup> were presented. Cobalt molybdate showed highest and fastest selective removal of Pb<sup>2+</sup> from aqueous solutions by surface adsorption. Unlike cobalt molybdate, other two supports did not show much activity in removing metals. Therefore, further studies were conducted only on this compound. Effects of temperature, pH, adsorbent dosage, lead metal ion concentration, and addition of graphene oxide (GO) with different weight-weight percentages were analyzed, and results for both prepared compounds CoMoO<sub>4</sub> and CoMoO<sub>4</sub>/GO were compared and reported. For adsorption tests, pH range of 2 to 6 was considered. Pseudo-second order kinetic model was found to have excellent data agreement and correlation coefficient. Intraparticle diffusion kinetics for metal ion has been investigated and described. Four important isotherm models in surface adsorption process such as Langmuir, Freundlich, Temkin and Redlich-Peterson were evaluated. Thermodynamic parameters such as ∆H, ∆S and ∆G, as well as activation energies related to processes were calculated, and results obtained for CoMoO<sub>4</sub>/GO were 0.98&#xa0;kJ/mol, 0.099&#xa0;kJ/Kmol, -28.3&#xa0;kJ/mol,&#xa0;and 0.028&#xa0;kJ/mol respectively. Remarkable adsorption capacity of CoMoO<sub>4</sub>/GO in aqueous solution with an initial concentration of 400&#xa0;ppm of Pb<sup>2+</sup> was 924&#xa0;mg g<sup>−1</sup>. During adsorption process in presence of CoMoO<sub>4</sub>/GO at initial concentrations of 100, 200, 300 and 400 ppm of Pb<sup>2+</sup>, times to reach equilibrium were only 2, 4, 8 and 16 min, respectively. High ability of CoMoO<sub>4</sub>/GO to rapidly and selectively remove significant amounts of Pb<sup>2+</sup> from aqueous solutions, as well as adjust rate of adsorption process, provides a promising approach for achieving a superadsorbent.</p>

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Fabrication of AMoO4 (A: Ni, Mn and Co) coupled with graphene oxide for fast and selective removal of heavy metal ions

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Hadi Salari,
  • Amir Masoudi

摘要

Nowadays, developing an effective method for fast and selective removal of metal ions is highly desired. The preparations of nickel molybdate, manganese molybdate, and cobalt molybdate using simple template-free methods were described in this work, and their results for removal of three heavy metals ions including Pb2+, Zn2+ and Cd2+ were presented. Cobalt molybdate showed highest and fastest selective removal of Pb2+ from aqueous solutions by surface adsorption. Unlike cobalt molybdate, other two supports did not show much activity in removing metals. Therefore, further studies were conducted only on this compound. Effects of temperature, pH, adsorbent dosage, lead metal ion concentration, and addition of graphene oxide (GO) with different weight-weight percentages were analyzed, and results for both prepared compounds CoMoO4 and CoMoO4/GO were compared and reported. For adsorption tests, pH range of 2 to 6 was considered. Pseudo-second order kinetic model was found to have excellent data agreement and correlation coefficient. Intraparticle diffusion kinetics for metal ion has been investigated and described. Four important isotherm models in surface adsorption process such as Langmuir, Freundlich, Temkin and Redlich-Peterson were evaluated. Thermodynamic parameters such as ∆H, ∆S and ∆G, as well as activation energies related to processes were calculated, and results obtained for CoMoO4/GO were 0.98 kJ/mol, 0.099 kJ/Kmol, -28.3 kJ/mol, and 0.028 kJ/mol respectively. Remarkable adsorption capacity of CoMoO4/GO in aqueous solution with an initial concentration of 400 ppm of Pb2+ was 924 mg g−1. During adsorption process in presence of CoMoO4/GO at initial concentrations of 100, 200, 300 and 400 ppm of Pb2+, times to reach equilibrium were only 2, 4, 8 and 16 min, respectively. High ability of CoMoO4/GO to rapidly and selectively remove significant amounts of Pb2+ from aqueous solutions, as well as adjust rate of adsorption process, provides a promising approach for achieving a superadsorbent.