Nitrate removal by calcined Hydrotalcite-type compounds
Soías-Viciana, María M. (University of Almería. Department of Inorganic Chemistry)
Ureña-Amate, María D. (University of Almería. Department of Inorganic Chemistry)
González-Pradas, Emilio (University of Almería. Department of Inorganic Chemistry)
García-Cortéz, María J. (University of Almería. Department of Inorganic Chemistry)
López-Teruel, Cristina (University of Almería. Department of Inorganic Chemistry)

Date:	2008
Abstract:	The sorption of nitrate ions on calcined hydrotalcite-type compounds at 550°C (HT550), 650°C ((HT650), and 850°C (HT850) from pure water solution at 25°C has been studied. The influence of the temperature was also investigated for the sample calcined at 850°C by studying the sorption process at 10 and 40°C. The experimental sorption data points were fitted to the Langmuir equation in order to calculate the sorption capacities (X) of the samples; X, values range from 61. 7 g kg (HT550 at 25°C) to 147. 0 g kg (HT850 at 40°C). The values for the removal efficiency (R) obtained ranged from 70. 5% for HT550 at 25°C to 99. 5% for HT850 at 40°C. The sorption experiments showed that the greater the calcination temperature (850°C), the more effective the removal of nitrate. The increase in the temperature from 10 to 40°C for sample HT850 also tends to increase the sorption of nitrate from 63. 3 g kg to 147 g kg and the corresponding removal efficiency from 71. 5 to 99. 5%.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Layered Double Hydroxides ; Nitrate Fertilizers ; Removal ; Water Pollution
Published in:	Clays and Clay Minerals, Vol. 56, Núm. 1 (2008) , p. 2-9, ISSN 1552-8367

DOI: 10.1346/CCMN.2008.0560101

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