Synthesis and characterization of adsorbents for the elimination of nitrates and bromates from water aiming to develop a continuous oxyanion water elimination system

It is known that the excess of oxyanions such as and in drinking water affects its quality. In this work, three adsorbents (montmorillonite (Mt), silica (Si), and diatomaceous earth) loaded with hexadecyl- (H) and octadecyl-trimethylammonium (O) were used to remove these oxyanions from aqueous solut...

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Bibliographic Details
Published in:Water science & technology. Water supply 2021-05, Vol.21 (3), p.1243-1252
Main Authors: Azaro, M., Flores, F. M., Casella, M., Peroni, B., Rodríguez, C., Torres Sánchez, R. M., Jaworski, M.
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Aqueous solutions
Aquifers
bromate
Bromates
Clay
column filtration
Diatomaceous earth
Drinking water
Experiments
Groundwater
Montmorillonite
Montmorillonites
nitrate
Nitrates
organo-montmorillonite
Removal
Silica
Silicon
Surfactants
Water analysis
Water quality
Water sampling
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Summary:It is known that the excess of oxyanions such as and in drinking water affects its quality. In this work, three adsorbents (montmorillonite (Mt), silica (Si), and diatomaceous earth) loaded with hexadecyl- (H) and octadecyl-trimethylammonium (O) were used to remove these oxyanions from aqueous solutions by adsorption. In batch systems, the highest removal was obtained with Mt modified with H and O (Mt-H and Mt-O), attaining 33% and 50%, respectively, while for removal Si modified with H and O, Si-H and Si-O samples, reached 38% and 42%, respectively. A direct relationship between the adsorption capacity of and and the mass of the adsorbent was found in column filtration tests with Mt-O and Mt-H samples in standard solution and real groundwater samples. The adsorption capacity of the column, in the groundwater sample, remained constant after two reuses.The results obtained are promising for the development of a continuous oxyanion removal system containing the low-cost clay Mt modified with either H or O.
ISSN:1606-9749
1607-0798
DOI:10.2166/ws.2020.324