Liquid-Liquid Extraction and Reductive Stripping of Chromium to Valorize Industrial Effluent
- Authors
- Srivastava, Rajiv Ranjan; Ilyas, Sadia; Kim, Hyunjung; Tri, Nguyen Le Minh; Hassan, Nouman; Mudassir, Muhammad; Talib, Nabila
- Issue Date
- Feb-2020
- Publisher
- SPRINGER
- Citation
- JOM, v.72, no.2, pp.839 - 846
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOM
- Volume
- 72
- Number
- 2
- Start Page
- 839
- End Page
- 846
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/187364
- DOI
- 10.1007/s11837-019-03948-0
- ISSN
- 1047-4838
- 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 (Delta H degrees, - 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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