Batch extraction studies of cationic and anionic heavy metallic species by a mixed solvent extraction system

Journal Article · Tue Dec 01 04:00:00 EST 1998 · Separation Science and Technology

DOI:https://doi.org/10.1080/01496399808545319· OSTI ID:323980

Chilukuri, R; Yang, Z F; Sirkar, K K ^[1]

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1. New Jersey Inst. of Tech., Newark, NJ (United States)

Removal of toxic heavy metals from wastewaters and their recovery is a challenging problem. Simultaneous and synergistic batch extraction from water of copper present as a cation (Cu{sup 2+}) and Cr{sup 6+} present as an anion (HCr{sub 2}O{sub 7}{sup {minus}}) into a mixed solvent extraction system have been studied. The mixed solvent extraction system consists of the diluent kerosene, the cation exchanger LIX 84, and trioctylamine (TOA) which extracts anions via ion-pair formation with a proton. Highly efficient extraction has been achieved for both copper and chromium. Simultaneous extraction of two cations, Cu{sup 2+} and Zn{sup 2+}, as well as the anionic form of Cr{sup 6+}, (HCr{sub 2}O{sub 7}{sup {minus}}), has also been studied using mixtures of LIX 84, di-2-ethylhexyl phosphoric acid (D2EHPA), and TOA in the diluent kerosene. For an appropriate mixture composition, all three metallic ionic species can be simultaneously extracted with high efficiency. The extent of complexation between the basic extractant, TOA, and the acidic extractant/s is important in determining the extraction efficiency. A model developed for the extraction of Cu{sup 2+} using a mixed solvent extraction system provides a reasonable description of the observed extraction behavior and provides a first step for modeling.

• Sponsoring Organization: USDOE
• OSTI ID: 323980
• Journal Information: Separation Science and Technology, Journal Name: Separation Science and Technology Journal Issue: 16 Vol. 33; ISSN 0149-6395; ISSN SSTEDS
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
54 ENVIRONMENTAL SCIENCES
CHROMIUM
COPPER
EXPERIMENTAL DATA
INDUSTRIAL WASTES
MATHEMATICAL MODELS
REMEDIAL ACTION
SOLVENT EXTRACTION
WASTE WATER
WATER TREATMENT
ZINC