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Extraction of humic acid by coacervate: Investigation of direct and back processes

Ghouas, Halima and Haddou, Boumediene and Kameche, Mohamed and Derriche, Zoubir and Gourdon, Christophe Extraction of humic acid by coacervate: Investigation of direct and back processes. (2012) Journal of Hazardous Materials, 205-206. 171-178. ISSN 0304-3894

(Document in English)

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Official URL: http://dx.doi.org/10.1016/j.jhazmat.2011.12.057


The two aqueous phases extraction process is widely used in environmental clean up of industrial effluents and fine chemical products for their reuse. This process can be made by cloud point of polyethoxylated alcohols and micellar solubilization phenomenon. It is commonly called “coacervate extraction” and is used, in our case, for humic acid extraction from aqueous solution at 100 mg/L. The surfactants used are alcohol polyethoxylate and alkylphenol polyethoxylate. Phase diagrams of binary water/surfactant and pseudo-binary are plotted. The extraction results are expressed by the following responses: percentage of solute extracted, E (%), residual concentrations of solute and surfactant in dilute phase (Xs,w, and Xt,w respectively) and volume fraction of coacervate at equilibrium (ϕ). For each parameter, the experimental results are fitted to empirical equations in three dimensions. The aim of this study is to find out the best compromise between E and ϕC. The comparison between experimental and calculated values allows models validation. Sodium sulfate, cetyltrimethylammonium bromide (CTAB) addition and pH effect are also studied. Finally, the possibility of recycling the surfactant has been proved.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com/science/article/pii/S0304389411015627
HAL Id:hal-00878996
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Université des Sciences et de la Technologie Mohamed Boudiaf d'Oran - USTO (ALGERIA)
Laboratory name:
Deposited On:31 Oct 2013 13:20

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