Integration of ion exchange and non-dispersive solvent extraction processes for the separation and concentration of Cr(VI) from ground waters

Galán, Berta; Castañeda, D.; Ortiz, Inmaculada

doi:10.1016/j.jhazmat.2007.07.084

Cited by 29 publications

(10 citation statements)

References 25 publications

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“…Several methods for removal of Cr(VI) from wastewater have been reported, including chemical precipitation [6], oxidation [7], ion exchange [8], reverse osmosis [9] and solvent extraction [10].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Cr(VI) using Fe-crosslinked chitosan complex (Ch-Fe)

Zimmermann

Mecabô

Fagundes

et al. 2010

Journal of Hazardous Materials

168

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Section: Introductionmentioning

confidence: 99%

Adsorption of Cr(VI) using Fe-crosslinked chitosan complex (Ch-Fe)

Zimmermann

Mecabô

Fagundes

et al. 2010

Journal of Hazardous Materials

168

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“…Other available conventional extraction technologies for heavy metals are the use of ionic exchange solid resins (IX) [3], solvent extraction with liquid extractants (SX) [4,5], solid-supported liquid membranes [6], surfactant liquid membranes [7,8], and biological methods [9]. However, most of them present limitations that prevent their use in many cases.…”

Section: Introductionmentioning

confidence: 99%

Cr(VI) sorption behavior from aqueous solutions onto polymeric microcapsules containing a long-chain quaternary ammonium salt: Kinetics and thermodynamics analysis

Barassi

Valdés

Araneda

et al. 2009

Journal of Hazardous Materials

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“…A sequence of non-dispersive solvent extraction and ion exchange was proposed to treat chromate in a high concentration. The non-dispersive solvent was used to recover the high concentration of chromate, and then ion exchange was used to meet the discharge limit of 0.5 ppm [18]. A two-stage electrodialysis process using a monovalent selective membrane was applied to purify chromate from electroplating effluents.…”

Section: Introductionmentioning

confidence: 99%

Metallic anion recovery from aqueous streams and removal agent recycle in the polymer–surfactant aggregate process

Shen

Hankins

2017

Desalination

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In a previous contribution, a new application of the polymersurfactant aggregate (PSA) process was developed; the removal of metallic anions from dilute aqueous solutions. A subsequent pH adjustment method has been developed to recover the metallic anions from the flocculated PSAs into a concentrated solution and then to recover the polymer (PAA) and surfactant (MTAB) for recycling. A base solution is firstly added to the flocs to leach out the bound metallic anions in 15 minutes, and then a coarse filter is used to separate out the basic solution containing 5-20 times more concentrated metallic anions than the original effluent. The flocs can then be completely dissolved in an acid solution for recycling. The results show that the recovery efficiency of CrO42-at an optimum pH of 12 is 94%, and the recovery efficiency of PAA-MTAB at its optimum pH of 1.4 is 94%. The removal efficiency of 0.2 mM CrO42solution remains at the same level using recovered PAA-MTAB. In short, the sequential pH adjustment method is able to recover and concentrate the metallic anions from the flocculated PSAs, and then recover the removal agent for recycling into the process with little deterioration of removal ability.

show abstract

Integration of ion exchange and non-dispersive solvent extraction processes for the separation and concentration of Cr(VI) from ground waters

Cited by 29 publications

References 25 publications

Adsorption of Cr(VI) using Fe-crosslinked chitosan complex (Ch-Fe)

Adsorption of Cr(VI) using Fe-crosslinked chitosan complex (Ch-Fe)

Cr(VI) sorption behavior from aqueous solutions onto polymeric microcapsules containing a long-chain quaternary ammonium salt: Kinetics and thermodynamics analysis

Metallic anion recovery from aqueous streams and removal agent recycle in the polymer–surfactant aggregate process

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