New metal-ion-exchange nanocomposites to remove molecular oxygen from water
Abstract
Synthesis of a nanocomposites starts with an ionic polymer with ion exchanging capability which is then chemically treated with an ionic salt solution of a metal and then chemically reduced to yield ionic polymer metal composites. The ion exchange capacity was determined by the chemical decomposition of the metal and then by the method of complexometric titration of the copper salt solution. Several widely used material science techniques are applicable for the characterization of the Cu nanoparticles. They include X-ray diffraction (XRD) and scanning electron microscopy (SEM). The kinetics was studied with gasometrical equipment.
The obtained «Lewatit» nanocomposites with a copper content equivalent to one and five cycles of metal deposition have an increased copper content compared to the KU-23 analogue, due to the high ion exchange capacity of hydrogen. According to XRD-analysis, all samples have a similar size of copper nanoparticles, SEM-analysis shows smaller copper agglomerates for samples with a «Lewatit» matrix, in comparison with «KU-23». It is shown, that at one cycle of metal deposition, «Lewatit» materials absorb large volumes of oxygen dissolved in water, and at five cycles of metal deposition, the differences are insignificant.
We demonstrate that the properties of the hybrid material depend on the nature of matrix and it properties as well as on the size of the nanoparticle dispersed within. Due to the high ion-exchange capacity, «Lewatit» nanocomposites contain high amounts of copper. The microscopy analysis shows, that the size of the nanocrystallites is smaller for the above composites. The combined effect of these factors has an impact on the high effectiveness of «Lewatit» materials for oxygen removal.
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