Calorimetric aspects of adsorption of pesticides 2,4-<Emphasis Type="SmallCaps">d</Emphasis>, diuron and atrazine on a magadiite surface |
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Authors: | Alécio R Nunes Aline O Moura Alexandre G S Prado |
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Institution: | (1) QuiCSI Team, Institute of Chemistry, University of Brasilia, C.P. 4478, Brasilia, DC, 70904-970, Brazil; |
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Abstract: | H-magadiite was applied to remove the pesticides 2,4-d, diuron, and atrazine from water. The H-magadiite containing herbicides adsorbed were investigated by FTIR, DRX, N2 adsorption and desorption isotherms, and surface area. Calorimetric studies were carried out to determine the heat of interaction
between pesticides and magadiite. It was possible to ride the cycle of interaction of magadiite–pesticide for a better understanding
of the process involved. From the results of the thermal effect of the interaction of magadiite–pesticide, the thermochemical
parameters can be determined by using the relationship between the data obtained from adsorption and calorimetry results.
The interaction of pesticide–magadiite follows the sequence of adsorption: diuron > atrazine > 2,4-d. The ΔH values for the interactions were determined to be −20.62 ± 1.08, −24.04 ± 0.86–26.34 ± 0.93 kJ mol−1 for 2,4-d, diuron and atrazine, respectively. All the interactions were spontaneous, enthalpically and entropically favored demonstrating
the effectiveness and efficiency of the method. |
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