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Título del libro: One Century Of The Discovery Of Arsenicosis In Latin America (1914-2014): As 2014 - Proceedings Of The 5th International Congress On Arsenic In The Environment
Título del capítulo: Synthesis of adsorbents with iron oxide and hydroxide contents for the removal of arsenic from water for human consumption

Autores UNAM:
SOFIA ESPERANZA GARRIDO HOYOS;

Autores externos:

Idioma:
Inglés

Año de publicación:
2014

Palabras clave:

Adsorbents; Adsorption; Arsenic; Chemical contamination; Rate constants; Silica sand; Water treatment; Adsorption capacities; Equilibrium value; Factorial design; Human consumption; Optimal conditions; Pseudo-second-order kinetic models; Removal of arsenics; Synthetic goethites; Chemicals removal (water treatment)

Resumen:

Two types of adsorption media, synthetic goethite and Fe(III)-coated silica sand, were developed to remove arsenic (As) present in water for human consumption. A surface area of 43.04 m2 g-1 was determined for the synthetic goethite and 2.44 m2 g-1 for Fe(III)-coated silica sand. A 23 factorial design was applied to evaluate concentration of As, pH and mass of the adsorbent to obtain the optimal conditions. The experimental data were fitted to a pseudo-second order kinetic model with a rate constant of adsorption (kad) of 4.019 g mg -1 min-1 for goethite and 0.745 g mg-1 min -1 for Fe(III)-coated silica sand. The equilibrium values, with an adsorption capacity (qm) of 0.4822 mg g-1 for goethite and 0.2494 mg g-1 for Fe(III)-coated silica sand, were fit to the Langmuir II model. The most efficient medium was synthetic goethite with 98.61% removal of arsenic and a concentration in treated water of 0.005 mg L -1. © 2014 Taylor & Francis Group.

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