Removal of paraquat from water by an Algerian bentonite
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URI: http://hdl.handle.net/10835/15798
DOI: http://dx.doi.org/10.1016/j.clay.2013.07.007
DOI: http://dx.doi.org/10.1016/j.clay.2013.07.007
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Ureña Amate, María DoloresDate
2013Abstract
The sorption–desorption of the cationic pesticide 1,1′-dimethyl-4,4′-bipyridinium dichloride (paraquat) on a
bentonite from Maghnia (Algeria) desiccated at 110 °C (M), and calcined at 400 °C (M400) and 600 °C
(M600) from aqueous solution at 25 °C has been studied using batch experiments. A complete characterization
of the natural and heat activated bentonite samples has been carried out through the following techniques: X-ray
fluorescence spectroscopy, FTIR, X-ray diffraction, thermogravimetric and differential thermogravimetric analysis
and surface analysis. In order to have a better understanding of the variables affecting the sorption of this herbicide,
factors such as the working temperature or the ionic strength of the solution have been investigated. The
sorption experimental data have been fitted to the Langmuir equation in order to calculate the maximum sorption
capacities (Xm) of the samples. The results show that the sorption capacity of the calcined samples greatly
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