Surface Complexes of Cr(VI) by Eucalyptus Barks

Hind Khalil(1*), Fatima Ezzahra Maarouf(2), Mariam Khalil(3), Sanaa Saoiabi(4), Saidati Bouhlassa(5), Ahmed Saoiabi(6), Mhamed Hmamou(7), Khalil Azzaoui(8)

(1) Laboratory of Applied Chemistry of Materials (LCAM), Department of Chemistry, Faculty of Sciences, Mohammed V University,4 Ibn Batouta Avenue in Rabat 1014, Morocco
(2) Laboratory of Applied Chemistry of Materials (LCAM), Department of Chemistry, Faculty of Sciences, Mohammed V University,4 Ibn Batouta Avenue in Rabat 1014, Morocco
(3) Laboratory of Applied Chemistry of Materials (LCAM), Department of Chemistry, Faculty of Sciences, Mohammed V University,4 Ibn Batouta Avenue in Rabat 1014, Morocco
(4) Laboratory of Applied Chemistry of Materials (LCAM), Department of Chemistry, Faculty of Sciences, Mohammed V University,4 Ibn Batouta Avenue in Rabat 1014, Morocco
(5) Laboratory of Applied Chemistry of Materials (LCAM), Department of Chemistry, Faculty of Sciences, Mohammed V University,4 Ibn Batouta Avenue in Rabat 1014, Morocco
(6) Laboratory of Applied Chemistry of Materials (LCAM), Department of Chemistry, Faculty of Sciences, Mohammed V University,4 Ibn Batouta Avenue in Rabat 1014, Morocco
(7) Laboratory of Applied Chemistry of Materials (LCAM), Department of Chemistry, Faculty of Sciences, Mohammed V University,4 Ibn Batouta Avenue in Rabat 1014, Morocco
(8) Laboratory of Applied Chemistry and Environment (LCAE), Department of Chemistry, Faculty of Sciences, University Mohamed I, P.O. Box 717, Oujda 60000, Morocco
(*) Corresponding Author


The sorption mechanism of hexavalent chromium sorption on eucalyptus barks was evaluated as a function of solution pH for different adsorbent dosages, surface coverage, and the amount of adsorbent. The chromium retention was evaluated based on the distribution coefficient (D), and this retention is attributed to  species, which is predominant between pH 1 and 6.5. The biosorption of Cr(VI) ions onto barks achieved at pH 2.0 in the highest sorbet conditions corresponding to [Cr(VI)] = 10–5 mol (V = 100 mL) is examined for various surface coverage. The surface complexes formed between chromate and eucalyptus barks were found to be > S (HCrO4) and > S (CrO4). Logarithmic stability for log K1–1 and the log K10 values of the complexes were measured and found to be -5.93 in acidic medium and -0.76 in alkaline medium, respectively. Pointed out that the adsorption of Cr(VI) on eucalyptus bark was greater than 90% in all cases, Cr(VI) recovery is strongly acidic dependent and shows maximum retention, for various sorbent amounts, at pH around 2, and this retention is attributed to  species, which is predominant between pH 1 and 6.5, the morphological surface of eucalyptus barks were examined by Scanning Electron Microscope (SEM) connected to a micro analyzer EDS.


chromium(VI); eucalyptus barks; surface complexes; adsorption; surface charge

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