淡江大學機構典藏:Item 987654321/55090
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    Title: Compressed Air-Assisted Solvent Extraction (CASX) for Chromate Removal: Regeneration and Recovery
    Authors: Lee, Po-Ching;Li, Chi-Wang;Chen, Shiao-Shing;Chiu, Hao-Chun
    Contributors: 淡江大學水資源及環境工程學系
    Keywords: Aliquat 336;Cr(VI);recovery;solvent extraction
    Date: 2009-12
    Issue Date: 2011-08-11 10:11:48 (UTC+8)
    Publisher: Philadelphia: Taylor & Francis Inc.
    Abstract: Compressed air-assisted solvent extraction (CASX), was employed to remove Cr(VI) from synthetic wastewater and electroplating wastewater with the effects of pH, extractant=diluent ratio, solvent dosage, and competing anion concentration on Cr(VI) removal efficiency explored. The dosages required for Cr(VI) removal are dependent upon the speciation of Cr(VI) with molar ratio between Aliquat 336 and Cr(VI) of 1:1 and 2.8:1 for HCrO4- and CrO24-, respectively. Efficiency of Cr(VI) regeneration is influenced by pH and chloride ion concentrations. Based on the affinity order of HCrO4- > Cl- > CrO24- > OH- to Aliquat 336 concluded from this study, alternation of Cr(VI) species to CrO24- by raising solution pH up to 8 and addition of chloride (50 times more of Aliquat 336 dosage applied) can satisfy the Cr(VI) regeneration from the spent solvent phase.
    Relation: Separation Science and Technology 44(16), pp.3911-3922
    DOI: 10.1080/01496390903256075
    Appears in Collections:[Graduate Institute & Department of Water Resources and Environmental Engineering] Journal Article

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