The sorption of metal ions on nanoscale zero-valent iron

Suponik, Tomasz; Popczyk, Marcin; Pierzyna, P.

doi:10.1051/e3sconf/201712301019

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…nZVI particles were prepared by the reduction of ferrous iron Fe(II) to Fe(0). The preparation method was detailed elsewhere [13]. Sodium borohydride was used as a reducing agent [3].…”

Section: Methodsmentioning

confidence: 99%

Reactivity of nZVI in the removal of Cu(II) and Zn(II) from synthetic mine drainage

Suponik¹,

Neculita²

2021

Environ. Protect. Eng.

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Adsorption properties, including isotherms and kinetics, of nano zero-valent iron (nZVI) for Cu(II) and Zn(II) removal from synthetic mine drainage were evaluated in batch tests. The influence of contact time, nZVI doses, pH, ionic strength, temperature, and concentration on nZVI adsorption properties was assessed. The removal of Cu(II) and Zn(II) increased with pH from 3 to 7 and then stabilized up to pH 10. Moreover, the increased Cu(II) adsorption capacity upon increasing temperature and a positive enthalpy change (∆H) indicate that the adsorption process is endothermic. The results also showed that the adsorption equilibrium for Cu(II) and Zn(II) was achieved after 50 and 30 min, respectively. Kinetics were best described by a pseudo-nth order model, with the order of sorption of 2.231 and 1.363, and the rate constants of 0.0008 and 0.0679 mg 1-n •g n-1 /min, for Cu(II) and Zn(II), respectively. The correlation between the amount of metals adsorbed on nZVI surface and the residual amount of metals in water during isothermal tests was best described by the nonlinear Sips model. Using this model, high qmaxS were found: 286.6 mg/g and 142.6 mg/g, for Cu(II) and Zn(II), respectively, as indication of their high sorption capacity.

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“…nZVI particles were prepared by the reduction of ferrous iron Fe(II) to Fe(0). The preparation method was detailed elsewhere [13]. Sodium borohydride was used as a reducing agent [3].…”

Section: Methodsmentioning

confidence: 99%

Reactivity of nZVI in the removal of Cu(II) and Zn(II) from synthetic mine drainage

Suponik¹,

Neculita²

2021

Environ. Protect. Eng.

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“…The Langmuir model is the simplest and the most commonly used model to represent the adsorption from a liquid phase by a solid phase. The Freundlich isotherm is an empirical equation which can be used to describe heterogeneous systems (Boddu et al 2003, Suponik et al 2017.…”

Section: The Isotherms Of the Adsorption Of Cr(vi) And Sr(ii) Ionsmentioning

confidence: 99%

Archives of Environmental Protection

He¹,

Chen²,

Zhang³

et al. 2019

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To investigate the adsorptive properties of a local laterite deposited in Chenzhou, Hunan province, China, the adsorptive properties of the natural laterite were investigated by batch technique in this study. The effects of contact time, pH, ionic strength, temperature, and the concentration on adsorption properties were also analyzed. The obtained experimental results show that the main mineral compo sition of laterite is kaolinite and montmorillonite. The adsorption process achieved equilibrium within 60 minutes and 90 minutes for Sr(II) and Cr(VI), respectively. The adsorption capacities for Cr(VI) and Sr(II) by the laterite were about 7.25 mg•g -1 and 8.35 mg•g -1 under the given experimental conditions, respectively. The equilibrium adsorption data were fi tted to the second-order kinetic equation. The adsorption capacity for Sr(II) onto the laterite increased with increasing pH from 3-11 but decreased with increasing ionic strength from 0.001 to 1.0 M NaCl. The Sr(II) adsorption reaction on laterite was endothermic and the process of adsorption was favored at high temperature. Similarly, the adsorption capacity for Cr(VI) onto the laterite increased with increasing pH from 3-11, however, the ionic strength and temperature had an insignifi cant effect on Cr(VI) adsorption. The adsorption of Cr(VI) and Sr(II) was dominated by ion exchange and surface complexation in this work. Furthermore, the Langmuir and Freundlich adsorption isotherm model was used for the description of the adsorption process. The results suggest that the studied laterite samples can be effectively used for the treatment of contaminated wastewaters.

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The sorption of metal ions on nanoscale zero-valent iron

Cited by 2 publications

References 11 publications

Reactivity of nZVI in the removal of Cu(II) and Zn(II) from synthetic mine drainage

Reactivity of nZVI in the removal of Cu(II) and Zn(II) from synthetic mine drainage

Archives of Environmental Protection

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