Abstract
A natural clay (NC) mostly identified for quartz, muscovite y montmorillonite is modified by means of ionic exchange to the C-FeMn y C-FeMnAl forms for the phosphate adsorption from aqueous solutions. The mineralogical composition of modified clays determines the formation of new mineralogical phases which are functional groups that improves the phosphate sorption capacity. The maximum sorption capacity is reported at 34.8 mg y 18.2 mg P-PO43-/g for C-FeMn y C-FeMnAl, respectively. The phosphate adsorption is highly influence by the pH of the work solution, so some sorption mechanisms are associated which is validate by the Langmuir isotherm model and intraparticular diffusion kinetic model. First a fast adsorption phase is associated with electrostatic attraction which is followed by a second slow adsorption phase due to the chemical complexation reactions. The phosphate desorption from C-FeMn y C-FeMnAl forms was 20 % which corresponds to the phosphorous labile fraction. C-FeMn y C-FeMnAl can be used for wastewater treatment however their limited use for phosphate sorption – desorption cycles evidence they can be evaluated amendment materials for soils.
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