title: Behaviour of silica and florisil as solid supports in the removal process of as(v) from aqueous solutions.
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.
authors.affiliation: Faculty of Industrial Chemistry and Environmental Engineering, University Politehnica of Timișoara, Boulevard Vasile Pârvan No. 6, 300223 Timișoara, Romania.
authors.forename: Andreea
authors.initials: A
authors.lastname: Gabor
authors.affiliation: Faculty of Industrial Chemistry and Environmental Engineering, University Politehnica of Timișoara, Boulevard Vasile Pârvan No. 6, 300223 Timișoara, Romania.
authors.forename: Corneliu Mircea
authors.initials: CM
authors.lastname: Davidescu
authors.affiliation: Faculty of Industrial Chemistry and Environmental Engineering, University Politehnica of Timișoara, Boulevard Vasile Pârvan No. 6, 300223 Timișoara, Romania.
authors.forename: Adina
authors.initials: A
authors.lastname: Negrea
authors.affiliation: Faculty of Industrial Chemistry and Environmental Engineering, University Politehnica of Timișoara, Boulevard Vasile Pârvan No. 6, 300223 Timișoara, Romania.
authors.forename: Mihaela
authors.initials: M
authors.lastname: Ciopec
authors.affiliation: Faculty of Industrial Chemistry and Environmental Engineering, University Politehnica of Timișoara, Boulevard Vasile Pârvan No. 6, 300223 Timișoara, Romania.
authors.forename: Lavinia
authors.initials: L
authors.lastname: Lupa
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