Abstract
The toxic vanadium (V) compounds of oil fly ash produced by power plants worldwide are posing a broad spectrum of many health threats and environmental hazards. Here, we use alkaline leaching and a simple two-step precipitation method to recycle vanadium from this industrial waste into nanostructured vanadium pentoxide (V2O5) for ethanol-sensing applications. The recovery of vanadium from the fly ash is maximized by applying the design of experiments based on the response surface methodology (RSM) to the fly ash leaching process. Containing small amounts of impurities such as Si, Al, Fe, and Ni, the recovered V2O5 shows up to 60% higher sensitivity toward ethanol than pure V2O5. Hence, the vanadium content of oil fly ash can be recycled into a product that holds great potential as a low-temperature ethanol sensor. This strategy not only helps mitigate the adverse effects of the landfill of the fly ash but also reduces the need for natural resources.
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Article Highlights
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Optimum leaching conditions for the fly ash are predicted as L/S ratio: 20 mL/g, temperature: 78 °C, time: 240 min, and NaOH concentration: 4 M.
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The maximum recovery of vanadium reaches 66.7% under the optimum leaching conditions.
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The recovered nanostructured V2O5 has a 37.5% smaller average crystallite size than the pure nanostructured V2O5.
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The recovered nanostructured V2O5 exhibits up to 60% higher sensitivity toward ethanol compared to the pure nanostructured V2O5.
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Acknowledgements
The authors gratefully thank Dr. Abbas Ali Khodadadi and Ms. Hamide Mohammad Aliha for their assistance with the gas-sensing tests.
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This study was funded by the University of Tehran.
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Nourizadeh, H., Noori, M., Mirazimi, M. et al. Characterization and Ethanol-Sensing Behavior of Nanostructured Vanadium Pentoxide Recovered from Oil Fly Ash. Int J Environ Res 15, 985–999 (2021). https://doi.org/10.1007/s41742-021-00361-x
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DOI: https://doi.org/10.1007/s41742-021-00361-x