Humic Acid-Fe(Hydr)oxide Composites Supported on Montmorillonite: Synthesis, Characterization, and Atrazine Adsorption

BIA, GONZALO; ORTIZ, PATRICIA I.; PFAFFEN, VALERIA; BORGNINO, LAURA

JOURNAL OF CHEMICAL AND ENGINEERING DATA

AMER CHEMICAL SOC

Año: 2017 vol. 62 p. 3793 - 3793

0021-9568

uch progress has been made involving the interaction of atrazine (Atz) with natural geosorbents like Fe(hydr)oxides, organic matter, and clay minerals. However, the properties of the humic acid-Fe(hydr)oxides-clay composites differ from their individual member phases, exerting an influence on the adsorption capacity and stability of the system. In this work, the evaluation of Atz adsorption onto humic acid-Fe(hydr)oxide supported on montmorillonite (HA-FeM) was performed. A combination of the X-ray diffraction pattern and batch adsorption experiments at different pH and ionic strength conditions were performed. The identification of the surface groups involved in the interaction FeM-Atz was carry out using X-ray photoelectron spectroscopy. The presence of Fe(hydr)oxides and humic acid improve the adsorption capacity of montmorillonite. Acidic pH and high ionic strength conditions further increases the adsorption. The heterogeneity of the surface sites and cooperative effect contribute