Header menu link for other important links
X
Removal of trace hexavalent chromium from aqueous solutions by ion foam fractionation
Published in Elsevier B.V.
2019
PMID: 30641429
Volume: 367
   
Pages: 589 - 598
Abstract
Ion foam fractionation is a green and cost-effective technology where separation of molecules exploits the difference in surface affinity. In this work, a batch ion foam fractionation system was designed and optimized for the separation of trace hexavalent chromium (Cr(VI)) from aqueous solutions. The effect of surfactant head groups (collectors) on the adsorption dynamics was analyzed. Cetyl trimethyl ammonium bromide (CTAB), a cationic surfactant showed high efficiency for the removal of Cr(VI) from aqueous solutions. An experimental investigation of the effect of different operational parameters on the separation characteristics is presented. The recovery of Cr(VI) increased with the increase in CTAB/Cr(VI) molar ratio and reached a maximum of 92.5% at optimum operating conditions. However, with CTAB concentrations close to the critical micelle concentration (CMC) wet foams were produced resulting in high liquid hold-up and poor enrichment ratio. The presence of Cr(VI) at the gas-liquid interface significantly improved the drainage characteristics of the foam decreasing the liquid hold-up. Further, a three-stage ion foam fractionation unit was developed with Cr(VI) removal efficiency of more than 99%. The concentration of Cr(VI) in the residue after the three-stage operation was less than 0.02 mg/L which is below the USEPA recommended standards for drinking water. © 2018 Elsevier B.V.
About the journal
JournalData powered by TypesetJournal of Hazardous Materials
PublisherData powered by TypesetElsevier B.V.
ISSN03043894
Open AccessNo
Concepts (39)
  •  related image
    Adsorption
  •  related image
    Cationic surfactants
  •  related image
    Chemicals removal (water treatment)
  •  related image
    Cost effectiveness
  •  related image
    Critical micelle concentration
  •  related image
    Dyes
  •  related image
    Efficiency
  •  related image
    Fractionation
  •  related image
    Ions
  •  related image
    Liquids
  •  related image
    Metal recovery
  •  related image
    Micelles
  •  related image
    Phase interfaces
  •  related image
    Potable water
  •  related image
    FOAM FRACTIONATION
  •  related image
    HEXAVALENT CHROMIUM REMOVALS
  •  related image
    MULTI-STAGE OPERATION
  •  related image
    RECOVERY RATIO
  •  related image
    SEPARATION FACTORS
  •  related image
    Chromium compounds
  •  related image
    CATIONIC SURFACTANT
  •  related image
    Cetrimide
  •  related image
    Chromium
  •  related image
    Ion
  •  related image
    TRACE METAL
  •  related image
    Aqueous solution
  •  related image
    Cation
  •  related image
    Experimental study
  •  related image
    Operations technology
  •  related image
    Optimization
  •  related image
    Pollutant removal
  •  related image
    Trace element
  •  related image
    Article
  •  related image
    Flow rate
  •  related image
    Foaming
  •  related image
    MOLAR TOOTH
  •  related image
    pH
  •  related image
    Surface tension
  •  related image
    Waste component removal