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Fabrication of novel amine-functionalized magnetic silica nanoparticles for toxic metals: kinetic and isotherm modeling

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In this research, an amine-functionalized magnetic silica nanosorbent was prepared using the co-precipitation technique, and this nanosorbent can be effortlessly detached using an external magnetic field. FTIR and SEM analyses identified that the nanosorbent holds extraordinary adsorption characteristics for toxic metals’ (copper, cadmium, zinc, and nickel) removal. The adsorption-affecting parameters were optimized, and the thermodynamic studies assessed that the adsorption process seemed to be spontaneous, feasible, and exothermic. The pseudo-first-order and Freundlich models perfectly fit the kinetic and equilibrium data, respectively. Langmuir monolayer capacity of the nanosorbent was analyzed using nonlinear evaluation methods such as 419.9 mg/g for copper, 321.9 mg/g for nickel, 217.3 mg/g for cadmium, and 137.6 mg/g for zinc. The used adsorbent was simply rejuvenated using the 0.2 N HCl solution subsequently with intense agitation. The result of the present research confirms that the produced nanosorbent can be effectively utilized for industrial wastewater management.

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Correspondence to Ponnusamy Senthil Kumar.

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Research highlights

1. Synthesis of effective novel nanosorbent for toxic metals.

2. Higher adsorption capacity of nanosorbent for Cu(II) ions was 419.9 mg/g.

3. Adsorption is exothermic and obeyed with Freundlich and pseudo-first-order models.

4. Adsorbent regeneration was done by using 0.2 N HCl and many adsorption/desorption cycles were carried out.

5. Scale up of the system is widely advised for industrial wastewater treatment.

Responsible editor: Tito Roberto Cadaval Jr

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Joshiba, G.J., Kumar, P.S., Christopher, F.C. et al. Fabrication of novel amine-functionalized magnetic silica nanoparticles for toxic metals: kinetic and isotherm modeling. Environ Sci Pollut Res (2019).

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  • Adsorption
  • Toxic metals
  • Nanosorbent
  • Modeling
  • Equilibrium
  • Kinetics