ADINA NEGREA, CORNELIA MUNTEAN, IOANA BOTNARESCU, MIHAELA CIOPEC, MARILENA MOTOC<br>Effect of Matrix Solution on As(V) Adsorption onto <br>Iron-containing Materials pH and kinetic studies

ADINA NEGREA, CORNELIA MUNTEAN, IOANA BOTNARESCU, MIHAELA CIOPEC, MARILENA MOTOC
Effect of Matrix Solution on As(V) Adsorption onto
Iron-containing Materials pH and kinetic studies

Abstract:

In the present paper is investigated the effect of the presence of some competing anionic (NO-3, PO3-4, Cl- and Co2-3) and cationic (Mg2+ and Mnn+) species on the adsorption of arsenic (V) on two iron containing materials: a waste material and a synthetic material. The waste material was an iron containing sludge (IS) resulting from hot-dip galvanization. The synthetic material was Fe2O3 obtained through annealing of Fe(COO)2·2H2O at 550 °C. For the studies, a synthetic solution containing 100 mg As(V)/L was used. The adsorption of As(V) over the initial pH range 2-11 for IS and 2-8 for Fe2O3 was not strongly dependent on pH. The influence of ionic species was investigated in single and in multicomponent competing ion solutions at two concentrations: 10 mg/L and 100 mg/L, respectively. Adsorption experiments were also carried out on a real groundwater containing the studied ions. The adsorption experiments were performed at different contact times (1, 2, 3, 4, 8 and 24 h). The presence of any ionic species has a negative effect on As(V) adsorption onto Fe2O3. Only PO43- showed a negative effect on the adsorption of As(V) onto IS. The other studied ions, in single and in multicomponent solutions had a positive effect on the adsorption of As(V) onto IS. Fe2O3 proved to be more efficient than IS for the adsorption of As(V) from solutions containing only this species (adsorption capacities of 97 mg/g and 45 mg/g, respectively). The presence of other species was benefic for the adsorption of As(V) onto IS from solutions containing all ions and the real underground water. The values of the adsorption capacity reached in these cases were very close for both adsorbent materials (~85 mg/g for the real water and ~80 mg/g for the all ions synthetic solution). These results indicate that IS would be a suitable adsorbent for the removal of As(V) ions from natural waters. The adsorption process followed a pseudo-second-order kinetics and the theoretically predicted equilibrium adsorption capacities were close to the experimentally determined values. Keywords: arsenic, adsorption, iron sludge, anion, cation, kinetics

Issue: 2013, Volume 64, Issue 4

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