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Chlorates(VII) removal on Dowex™PSR-2 resin

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Kołodyńska D., Łyko A., Gęca M., Hubicki Z.
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
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2016
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vol. 71
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issue 1
EN
Lately there has been observed the increased presence of chlorates(VII) in the natural environment which can affect human health negatively. Therefore the removal of chlorate(VII) ions using the gel type resin functionalized with the tri-n-butyl ammonium (Dowex™PSR-2) from waters was studied. The main aim was to evaluate the effects of experimental conditions including contact time, initial solution concentration, pH and temperature on chlorate(VII) ions removal as well as the anion exchanger properties on chlorate(VII) ions sorption. It was found that only the pseudo second order model described the experimental data well and the intraparticle diffusion was not the rate-limiting step. According to the Freundlich model, the qe value was to be 69.26 mg/g at optimum conditions (pH 7.0 at 25 oC).
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Sorption of Cu(II) and Ni(II) ions in the presence of the methylglycinediacetic acid by microporous ion exchangers and sorbents from aqueous solutions

100%
Jachuła J., Kołodyńska D., Hubicki Z.
Open Chemistry
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2011
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vol. 9
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issue 1
52-65
EN
In the presented paper the use of a novel environmentally friendly aminopolycarboxylate chelating agent trisodium salt of methylglycinediacetic acid (MGDA) to inactivate various metal ions by complex formation in microporous anion exchangers and sorbents was tested. MGDA is a new generation of chelator, undergoing biodegradation. The removal of Cu(II) and Ni(II) ions from aqueous solutions in the presence of MGDA on microporous anion exchangers of the Lewatit group with different basicity of functional centres as well as on nitrolite and clinoptilolite was described. The studies were carried out by the dynamic (column) and the static (batch) methods. The influence of several parameters such as the concentration of analyzed metal ions, pH and temperature were studied with respect to sorption equilibrium. The sorption isotherms were obtained and fitted using the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R) models. Kinetic curves were also fitted using pseudo first order, pseudo second order as well as the intraparticle diffusion model equations to evaluate the most effective one. [...]
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