Disposición final de arcillas calcinadas con Cd(II) adsorbido en matrices calcáreas: evaluación del crecimiento fúngico

Gisele Portela; Carolina Iraporda; Luciana B. Silvestro; Claudia Cecilia Wagner; Alejandra Tironi

doi:10.24215/25456377e176

Authors

Gisele Portela Facultad de Ingeniería, CIFICEN Centro de investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires (CONICET ? CICPBA ? UNCPBA)
Carolina Iraporda Facultad de Ingeniería, Núcleo TECSE (CONICET ? CICPBA ? UNCPBA)
Luciana B. Silvestro Facultad de Agronomía, BIOLAB (INBIOTEC-CONICET-CICPBA
Claudia Cecilia Wagner Facultad de Ingeniería, CIFICEN Centro de investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires (CONICET ? CICPBA ? UNCPBA)
Alejandra Tironi Facultad de Ingeniería, CIFICEN Centro de investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires (CONICET ? CICPBA ? UNCPBA)

DOI:

https://doi.org/10.24215/25456377e176

Keywords:

Cd(II) adsorption, Calcined illite, Calcined disordered kaolinite, Hydraulic lime, Aspergillus, Cladosporium,

Abstract

The adsorption process using natural and calcined clays as adsorbents has become a preferred method for removing toxic contaminants from water as it is very effective, unexpensive, straightforward and versatile. It becomes necessary to evaluate its final disposition, such as part of cementitious or calcareous matrices. On the other hand, heavy metals are potentially fungistatic, thus the interest in evaluating changes in the susceptibility to fungal growth in calcareous matrices made with calcined clays with adsorbed cadmium. The goal of this work is to study the final disposition of calcined clays used for the adsorption of Cd(II) in hydraulic lime pastes, while assessing the functionality of the adsorbed Cd(II) as a retardant component for the development of fungal strains of the genera Aspergillus and Cladosporium. Hydraulic lime and calcined clays with and without adsorbed cadmium were used to make the pastes, which were kept for one month in a humid chamber and later for one month in a rain-free environment. The phases were determined for all pastes by X-ray diffraction and Fourier Transform Infrared Spectroscopy. The amount of leached Cd(II) was determined using Atomic Absorption Spectroscopy, and the fungal growth of Aspergillus sp. and Cladosporium cladosporioides strains was evaluated. We concluded that hydraulic lime pastes are a suitable matrix to contain calcined clays with adsorbed Cd(II) without altering the phases obtained during the hydration-carbonation processes and without Cd(II) leaching. We observed a delay in the development of Aspergillus and Cladosporium on the surfaces of the pastes that contained calcined illite and calcined illite with adsorbed cadmium.

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