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Liquid–Liquid Extraction and Reductive Stripping of Chromium to Valorize Industrial Effluent

Title
Liquid–Liquid Extraction and Reductive Stripping of Chromium to Valorize Industrial Effluent
Author
김현중
Keywords
SOLVENT-EXTRACTION; HEXAVALENT CHROMIUM; RECOVERY; REMOVAL; CR(VI); ACID; ALIQUAT-336; ADSORPTION; MEMBRANE; STREAMS
Issue Date
2020-02
Publisher
SPRINGER
Citation
JOM, v. 72, no. 2, page. 839-846
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.
URI
https://link.springer.com/article/10.1007%2Fs11837-019-03948-0https://repository.hanyang.ac.kr/handle/20.500.11754/165661
ISSN
1047-4838; 1543-1851
DOI
10.1007/s11837-019-03948-0
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > EARTH RESOURCES AND ENVIRONMENTAL ENGINEERING(자원환경공학과) > Articles
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