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Recovery of chromium from wet blue shavings and its use as a semiconductor for wastewater treatment

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Abstract

The recovery of chromium from wet blue shavings using organic salts was studied in order to give added value to this waste. Different parameters were evaluated using sodium oxalate: pH, treatment time, temperature of the reaction medium, dose of sodium oxalate, stirring speed and solid–liquid ratio. During the experimental leaching tests, samples were taken at regular time intervals in order to analyze the amount of chromium recovered as well as the soluble proteins and organic matter. A chromium recovery rate of 94% was obtained under the following optimal conditions: sodium oxalate 0.02 wt.%, S/L ratio 1/100 g/mL, neutral medium, temperature 60 °C, treatment time 600 min and stirring speed 500 rpm. The shavings before and after treatment were characterized by X-ray fluorescence, scanning electron micrograph and Fourier transform infrared. In addition, an artificial neural network model was used to estimate the recovery rate of chromium. The relative significance of the input parameters was calculated, and the input with the greatest impact was revealed to be the S/L ratio. In the last step, the chromium-rich solution obtained via the optimal conditions was used successfully in the doping of ZnO powder obtained by co-precipitation. The obtained powders were characterized by X-ray diffraction and UV–Vis spectroscopy and then examined the degradation of dyes under a visible light source.

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Acknowledgment

We send our thanks to the General Directorate of Scientific Research and Technological Development (DGRSDT) for having financed the thesis work. We thank Mrs. D. Zerrouki for their help in the analysis of samples.

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HB: writing-original draft preparation, AB: writing—review and editing, MTA: supervision

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Correspondence to A. Benhadji.

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Editorial responsibility: Samareh Mirkia.

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Belkacemi, H., Benhadji, A. & Taleb Ahmed, M. Recovery of chromium from wet blue shavings and its use as a semiconductor for wastewater treatment. Int. J. Environ. Sci. Technol. 20, 6319–6338 (2023). https://doi.org/10.1007/s13762-022-04317-2

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  • DOI: https://doi.org/10.1007/s13762-022-04317-2

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