Abstract
To develop a green, rapid and energy-efficient route for the toxic waste immobilization, chromium was captured from aqueous system and subsequently solidified using calcium hydroxyapatite (HA) powder. The effect of sintering temperatures on the inter-conversion of Cr(III/VI) species in the HA matrix was investigated by synchrotron X-ray absorption fine structure spectroscopy. The results of X-ray absorption near edge structure showed the gradual transformation of Cr(III) to Cr(VI) oxides from ~ 0 to ~ 100% at sintering temperatures of 100–1150 °C. The extended X-ray absorption fine structure results revealed a typical Cr(III) oxide as the dominant structure at a temperature lower than 500 °C and Cr(VI) oxide structure at higher temperatures. Thus, the oxidation behavior of Cr(III) is strongly dependent on sintering temperatures. Therefore, this study will help to design a waste management route for toxic wastes including Cr(VI) to reduce its leaching from the waste matrix. Rapid oxidation of Cr(III) inside HA matrix may be avoided by adopting low-temperature sintering techniques.
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Article Highlights
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Nanoceramic hydroxyapatite was used to capture and solidify chromium simultaneously for rapid waste management.
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The effect of sintering temperatures on the inter-conversion of Cr(III/VI) species was investigated.
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The chemical behavior of Cr metal in the HA matrix is strongly dependant on sintering temperatures.
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XAFS study showed Cr(III) transformation to Cr(VI) from 0 to 100 % by increasing sintering temperature from 100 to 1150 °C.
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Acknowledgements
This research was supported by the Pakistan Institute of Nuclear Science and Technology (PINSTECH), Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2016R1A5A1013919), Richard Lounsbery Foundation and the SESAME, Allan Jordan.
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Iqbal, S., Faiz, Y., Harfouche, M. et al. Temperature-Dependent Speciation Analysis of Chromium Immobilized in Calcium Hydroxyapatite Matrix. Int J Environ Res 16, 40 (2022). https://doi.org/10.1007/s41742-022-00421-w
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DOI: https://doi.org/10.1007/s41742-022-00421-w