Title: Humic acid interaction with clay minerals. Modification of the surface properties by calcium presence

Authors: Alejandra M. Fernández Solarte; Mariela A. Fernández; Maria Dos Santos Afonso; Rosa M. Torres Sánchez

Addresses: CETMIC (Centro de Tecnología de Recursos Minerales y Cerámica) CCT-La Plata, CIC. Camino Centenario y 506 (CC.49) (B1897ZCA), M. B. Gonnet, Argentina ' CETMIC (Centro de Tecnología de Recursos Minerales y Cerámica) CCT-La Plata, CIC. Camino Centenario y 506 (CC.49) (B1897ZCA), M. B. Gonnet, Argentina ' Facultad de Ciencias Exactas y Naturales, INQUIMAE and Departamento de Química Inorgánica, Analítica y Química Física, Universidad de Buenos Aires, Ciudad Universitaria Pabellón II 3er Piso, C1428EHA Buenos Aires, Argentina ' CETMIC (Centro de Tecnología de Recursos Minerales y Cerámica) CCT-La Plata, CIC. Camino Centenario y 506 (CC.49) (B1897ZCA), M. B. Gonnet, Argentina

Abstract: The environmental importance of humic acid (HA) is mainly related to soil fertility, but it can also develop some human diseases by its intake as well as prevent calcium assimilation. Physicochemical characterisations of a montmorillonite (Mt) and its thermal treated product (Mt550), to which HA, Ca⁺² or both were added, will help to better understand the surface behaviour of the binary or ternary systems. Calcium or HA adsorption produces a decrease of the Mt and Mt550 specific surface area (SSA). X-ray diffraction indicates calcium presence and no entrance of humic acid in the interlayer of Mt, while in the ternary systems (calcium-HA-Mt) a hindrance to the calcium entrance was observed. The opposite behaviour produces the adsorption of HA or calcium on electric charge of both samples. The mean pore diameter (MPD) for Mt increases with Ca⁺² adsorption while no change was found after HA adsorption, in contrast to that found for Mt550.

Keywords: thermally treated montmorillonite; porosity; specific surface area; humic acid; clay minerals; surface properties; calcium.

DOI: 10.1504/IJENVH.2015.073196

International Journal of Environment and Health, 2015 Vol.7 No.3, pp.215 - 230

Received: 22 Nov 2014
Accepted: 10 Mar 2015
Published online: 27 Nov 2015 *

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