Abstract
Research works on the removal of mercury from water by zeolitic mineralshow that small quantities of this element are sorbed. In this work the mercury sorption from aqueous solutions in the presence and absence of Cu(II), Ni(II) and Zn(II) onto a Mexican zeolitic mineral unmodified and modified with cysteamine hydrochloride or cystamine dihydrochloride was investigated in acidic pH. The zeolitic minerals were characterized by thermogravimetric analysis, scanning electron microscopy, X-ray diffraction and FTIR. The sorption kinetics behavior and the retention isotherms for mercury were determined in the natural and treated zeolitic mineral samples. It was found that the amounts of sulfur on the modified zeolitic minerals were 0.375 (cysteamine hydrochloride) and 0.475 (cystamine dihydrochloride) mmol g-1, which were not saturated to their total capacities of adsorption for the maximum concentration used (0.310 mM). Under the experimental conditions, the retention of mercury was the highest for the zeolitic minerals treated with the organic compounds, with adsorption capacities ranging from 0.0107 to 0.0509 mmol Hg g-1.The retention was not affected by the presence of others heavy metals studied in this work as expected.
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Gebremedhin-Haile, T., Olguín, M.T. & Solache-Ríos, M. Removal of Mercury Ions from Mixed Aqueous Metal Solutions by Natural and Modified Zeolitic Minerals. Water, Air, & Soil Pollution 148, 179–200 (2003). https://doi.org/10.1023/A:1025474001939
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DOI: https://doi.org/10.1023/A:1025474001939