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Open AccessArticle

New Chitosan/Iron Oxide Composites: Fabrication and Application for Removal of Sr2+ Radionuclide from Aqueous Solutions

1
Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, prospect 100-letiya Vladivostoka, 159, Vladivostok 690022, Russia
2
Far Eastern Federal University, Sukhanova str., 8, Vladivostok 690000, Russia
3
Far East Geological Institute, Far Eastern Branch, Russian Academy of Sciences, prospect 100-letiya Vladivostoka, 159, Vladivostok 690022, Russia
*
Author to whom correspondence should be addressed.
Biomimetics 2018, 3(4), 39; https://doi.org/10.3390/biomimetics3040039
Received: 2 November 2018 / Revised: 26 November 2018 / Accepted: 27 November 2018 / Published: 4 December 2018
(This article belongs to the Special Issue Chitin- and Chitosan-Based Composite Materials)
Here, we discuss the fabrication and problems of application of chitosan-based composite materials for the removal of hazardous metal ions from tap water and wastewater. The chitosan-based composites containing iron oxides for the uptake of Sr2+ ions were fabricated via a co-precipitation method with variation of the iron/chitosan ratio and pH of the medium. The morphology and composition of the fabricated sorbents were characterized using scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM–EDX) and X-ray diffraction (XRD) analysis. We have shown that the suggested fabrication approach allows for a homogeneous distribution of the inorganic phase in the polymer matrix. Investigations of the sorption performance of the composites have shown that they are efficient sorbents for 90Sr radionuclides uptake from tap water. The composite sorbent containing amorphous iron oxide in a chitosan matrix and calcined at 105 °C showed the best sorption characteristics. We have also demonstrated that there is an optimal iron oxide content in the composite: with increasing oxide content, the efficiency of the sorbents decreases due to poor stability in solution, especially in alkaline media. The alternative approach yielding magnetic chitosan-based composites with sufficiently good sorption performance and stability in neutral and weakly alkaline media is suggested. View Full-Text
Keywords: composite materials; biosorbents; chitosan; iron oxides; strontium; adsorption composite materials; biosorbents; chitosan; iron oxides; strontium; adsorption
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MDPI and ACS Style

Zemskova, L.; Egorin, A.; Tokar, E.; Ivanov, V.; Bratskaya, S. New Chitosan/Iron Oxide Composites: Fabrication and Application for Removal of Sr2+ Radionuclide from Aqueous Solutions. Biomimetics 2018, 3, 39.

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