Abstract
This work investigates the catalytic properties toward sulfide oxidation in wastewater for three composites which are functional materials obtained from red mud waste following its neutralization, chemical activation and functionalization of the iron by treatment with disodium salt of ethylenediaminetetraacetic acid, trisodium citrate or a combination of these two organic ligands. X-ray diffraction and diffuse reflectance Fourier transformed infrared spectroscopy characterizations indicated the coexistence of the corresponding iron chelates phases along with hematite the main crystallographic phase from red mud. The most active catalyst was the red mud-derived material obtained by functionalization with the mixture of ethylenediaminetetraacetate and citrate ligands. The results obtained after its testing in multiple reaction cycles showed that the decrease in conversion after 10 reaction cycles was less than 5%. Considering the results of diffuse reflectance ultraviolet visible narrow infrared spectroscopical analysis which revealed that this solid contains species with lower bond strength, it has been inferred that both the higher catalytic activity, as well as the enhanced stability, is directly related to the versatility of the active species.
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Acknowledgements
Authors acknowledge the financial support of this work by the Executive Agency for Higher Education, Research, Development and Innovation Funding (UEFISCDI) through Collaborative Applied Research Project—Grant Number 78/2014. We would also like to express our gratitude to Dr. Ruxandra Birjega for fruitful discussions.
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Cruceanu, A., Zăvoianu, R., Pavel, O.D. et al. Alternative valorization of red mud waste as functional materials with catalytic activity for sulfide oxidation in wastewater. Int. J. Environ. Sci. Technol. 15, 895–908 (2018). https://doi.org/10.1007/s13762-017-1449-1
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DOI: https://doi.org/10.1007/s13762-017-1449-1