Heavy metal removal in water using magnetic bioadsorbents
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Abstract
In this study, synthesis, characterization, and application of a pectin - magnetite bioadsorbent with magnetic properties for heavy metal removal in aqueous solutions were carried out. Pectin was obtained from Aloe Vera leaves whereas magnetite nanoparticles were incorporated through coprecipitation method. The material was characterized via FTIR, XRD, and SEM techniques. The maximum adsorption capacity for Lead (II) and Chromium (VI) ions was estimated through adsorption isotherms, resulting in 36,442 mg Pb/g and 2,254 mg Cr/g. This indicates a higher affinity from the bioadsorbent toward Lead (II). The removal of Lead (II) was also evaluated in a packed bed adsorber, both with fresh bed, and reused bed under an external magnetic field; adsorption capacities of 9,6 mg/g and 5,3 mg/g were obtained, respectively. The magnetic properties of the material allowed for modifications in the evaluated schemes, proposing new arrangements and comparing their efficiency in terms of adsorption capacity and dimensions. The most efficient schemes were the packed column and the coated tube (WCOT), where the adsorbent was annularly disposed on a coated wall.
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Mundo Nano. Revista Interdisciplinaria en Nanociencias y Nanotecnología por Universidad Nacional Autónoma de México se distribuye bajo una Licencia Creative Commons Atribución-NoComercial 4.0 Internacional.
Basada en una obra en http://www.mundonano.unam.mx.
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