Abstract
Liquid–liquid extraction of chromium from industrial effluent has been investigated using tributyl phosphate as a potential extractant. Variation of parameters such as the extractant dosage, acid concentration, temperature, and organic-to-aqueous (O/A) ratio revealed that extraction took place through outer-sphere complexation. The adduct formation was further supported by Fourier-transform infrared analysis of the organic phase and the determined enthalpy value (ΔH°, − 18.8 kJ/mole). As predicted by the McCabe–Thiele diagram, quantitative extraction of approximately 5.0 g/L Cr6+ was achieved by two-stage countercurrent extraction at O/A ratio of 1/1.5. Subsequent stripping of the extracted metal in reduced form (as Cr3+) was carried out using ≥ 1.5 M ascorbic acid with 30 min of contact time. Finally, the critical metal was precipitated to recover Cr(OH)3 by pH swing of the stripped solution using NH4OH.
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Acknowledgements
This work was supported by the Brain Pool Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (Grant No. 2019H1D3A2A02101993). Sadia Ilyas is grateful to the NRF for providing the Brain Pool Scientists award.
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Srivastava, R.R., Ilyas, S., Kim, H. et al. Liquid–Liquid Extraction and Reductive Stripping of Chromium to Valorize Industrial Effluent. JOM 72, 839–846 (2020). https://doi.org/10.1007/s11837-019-03948-0
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DOI: https://doi.org/10.1007/s11837-019-03948-0