Please use this identifier to cite or link to this item:https://hdl.handle.net/20.500.12259/104321
Type of publication: Straipsnis / Article
Author(s): Martins, Dina Alexandra;Simões, Manuel;Melo, Luís
Title: Adsorption of paraquat dichloride to kaolin particles and to mixtures of kaolin and hematite particles in aqueous suspensions
Is part of: Journal of water security, 2015, vol. 1, p. 25-36
Date: 2015
Keywords: Water contamination;Adsorption;Paraquat;Kaolin;Hematite
Abstract: Deliberate contamination with pesticides is a potential risk to water security, due to the availability of these contaminants and the fact that they do not need special expertise to handle or apply. Adsorption of the herbicide paraquat from an aqueous solution to suspended particles of kaolin and kaolin/hematite mixture was investigated by kinetic and equilibrium assays, taking into consideration several parameters such as initial pH, sorbent dosage and agitation speed. The results showed that the adsorption process is quite fast, reaching an 18% reduction in paraquat concentration in a very short period of time. The addition of hematite particles to kaolin suspension had no apparent effect on the maximum amount of paraquat adsorbed. Kinetic parameters were determined by fitting the pseudo-second order model to the experimental data (correlation coefficients close to 1). Isotherm studies indicate an inhibitory effect, promoted by hematite particles, that was not detected in the adsorption assays. Equilibrium data was best adjusted using the Langmuir model which yielded higher correlation coefficient values and smaller normalized standard deviations.
Internet: http://dx.doi.org/10.15544/jws.2015.003
https://hdl.handle.net/20.500.12259/104321
Appears in Collections:Journal of Water Security 2015, vol. 1

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