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Abstract
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| Much of the boron that is present in our environment isnaturally occurring. High levels of boron are found in groundwater, in areas associated with geothermal activity. Excess boron in water can affect the blood plasma and the endocrine system of human beings. For this reason, the World Health Organization has recommended a boron concentration of 0.5 mg/L in drinking water as the maximum permissible limit. Hydrotalcite-like compounds of general formula [Mg+21-x Al3+x(OH)2](An-)x/n.mH2O, belong to a family of inorganic laminar structures, called anionic clays. The thermal decomposition of these structures generates mixed oxides, which have the property of laminar reconstruct aqueous solutions contact the structure. This property is called a memory effect. These oxides along with commercial MgO, were compared in the removal of borates in water. MgAl hydrotalcites and mixed oxides were synthesized by the coprecipitation method, the molar ratio Mg/Al was varied between 2 and 4. The solids were characterized by XRD and surface area, before and after removal. For each analysis time a batch reactor was used at room temperature maintaining the molar ratio Mg/B equal to 20. Initial boron concentration in the solution was 50 ppm, the samples were filtered with paper 20-25 ?m, the remaining concentration in the treated samples was measured by UV-Vis by colorimetric technique with azomethine-H. By XRD was observed that in all cases the mixed oxides reconstructed laminar structure incorporating the borate anion in the interlayer, while the MgO sample also presented Mg(OH)2 phase. The mixed oxide of the molar ratio Mg/Al equal to 2 showed the highest yield with 92% removal of Borate at the 180 min contact time. | |
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International
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Si |
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Congress
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Congreso Internacional de metalurgia y materiales: 16º SAN-CONAMET |
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970 |
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Place
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Reviewers
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Si |
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ISBN/ISSN
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978-950-33-1304-6 |
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Start Date
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22/11/2016 |
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End Date
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25/11/2016 |
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From page
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1056 |
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To page
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1057 |
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Libro de Resúmenes del 16º Congreso Internacional de Metalurgia y Materiales SAM-CONAMET 2016. Simposio Materiales y Tecnologías para la Industria Metalmecánica y Aeroespacial. |