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Behaviour of silica and florisil as solid supports in the removal process of as(v) from aqueous solutions.

Gabor A, Davidescu CM, Negrea A, Ciopec M, Lupa L - J Anal Methods Chem (2015)

Bottom Line: The impregnated solid supports were characterized by energy dispersive X-ray analysis, scanning electron microscopy, Fourier transform infrared spectroscopy, and the specific surface area.Thermodynamic studies as well as equilibrium studies were carried out.The obtained results showed that, from the two considered materials, impregnated silica presents a higher efficiency with a good selectivity, able to remove As(V) from aqueous solutions containing trace concentrations.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Industrial Chemistry and Environmental Engineering, University Politehnica of Timișoara, Boulevard Vasile Pârvan No. 6, 300223 Timișoara, Romania.

ABSTRACT
In this study two solid supports, silica and florisil, were impregnated with crown ether (dibenzo-18-crown-6) and Fe(III) ions and their efficiency was compared in the adsorption process of As(V) from aqueous solutions. The solid supports were impregnated with crown ether due to their ability to build complexes with positives ions. Fe(III) was used because of As(V) affinity for it. The impregnated solid supports were characterized by energy dispersive X-ray analysis, scanning electron microscopy, Fourier transform infrared spectroscopy, and the specific surface area. The influence of the solid : liquid ratio on the adsorption process, kinetic studies for the pseudo-first-order and pseudo-second-order, and activation energy were studied. Thermodynamic studies as well as equilibrium studies were carried out. The obtained results showed that, from the two considered materials, impregnated silica presents a higher efficiency with a good selectivity, able to remove As(V) from aqueous solutions containing trace concentrations.

No MeSH data available.


Langmuir isotherm for As(V) adsorption on impregnated silica and florisil.
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fig11: Langmuir isotherm for As(V) adsorption on impregnated silica and florisil.

Mentions: The Langmuir isotherm can be expressed in linear form(6)Ceqe=1KLqm+Ceqm,where qe is the amount of As(V) adsorbed per gram adsorbent, qm is the monomolecular adsorption capacity (μg/g), Ce is the equilibrium concentration of the adsorbate in solution after the adsorption (μg/L), and KL is the Langmuir constant. From the linear plot of Ce/qe versus Ce, the values for KL and qm can be calculated (Figure 11) [8].


Behaviour of silica and florisil as solid supports in the removal process of as(v) from aqueous solutions.

Gabor A, Davidescu CM, Negrea A, Ciopec M, Lupa L - J Anal Methods Chem (2015)

Langmuir isotherm for As(V) adsorption on impregnated silica and florisil.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4364358&req=5

fig11: Langmuir isotherm for As(V) adsorption on impregnated silica and florisil.
Mentions: The Langmuir isotherm can be expressed in linear form(6)Ceqe=1KLqm+Ceqm,where qe is the amount of As(V) adsorbed per gram adsorbent, qm is the monomolecular adsorption capacity (μg/g), Ce is the equilibrium concentration of the adsorbate in solution after the adsorption (μg/L), and KL is the Langmuir constant. From the linear plot of Ce/qe versus Ce, the values for KL and qm can be calculated (Figure 11) [8].

Bottom Line: The impregnated solid supports were characterized by energy dispersive X-ray analysis, scanning electron microscopy, Fourier transform infrared spectroscopy, and the specific surface area.Thermodynamic studies as well as equilibrium studies were carried out.The obtained results showed that, from the two considered materials, impregnated silica presents a higher efficiency with a good selectivity, able to remove As(V) from aqueous solutions containing trace concentrations.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Industrial Chemistry and Environmental Engineering, University Politehnica of Timișoara, Boulevard Vasile Pârvan No. 6, 300223 Timișoara, Romania.

ABSTRACT
In this study two solid supports, silica and florisil, were impregnated with crown ether (dibenzo-18-crown-6) and Fe(III) ions and their efficiency was compared in the adsorption process of As(V) from aqueous solutions. The solid supports were impregnated with crown ether due to their ability to build complexes with positives ions. Fe(III) was used because of As(V) affinity for it. The impregnated solid supports were characterized by energy dispersive X-ray analysis, scanning electron microscopy, Fourier transform infrared spectroscopy, and the specific surface area. The influence of the solid : liquid ratio on the adsorption process, kinetic studies for the pseudo-first-order and pseudo-second-order, and activation energy were studied. Thermodynamic studies as well as equilibrium studies were carried out. The obtained results showed that, from the two considered materials, impregnated silica presents a higher efficiency with a good selectivity, able to remove As(V) from aqueous solutions containing trace concentrations.

No MeSH data available.