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Investigation of mercury (II) and copper (II) sorption in single and binary systems by alginate/polyethylenimine membranes

Abstract : This study investigates Hg(II) and Cu(II) sorption in single and binary systems by alginate/polyethylenimine membranes. Batch experiments are conducted to assess the metal sorption performance and complementary. FTIR and SEM-EDX analyses are used to identify metal binding. The sorption kinetics are better fitted by the pseudo-second-order-equation compared to the pseudo-first-order-equation. Three isotherms are compared for fitting the sorption in mono-component solutions and the Sips model gives the best simulation of experimental data. The competitive-Sips model fits well sorption data in Hg-Cu binary solutions and finds that the Cu uptake is drastically reduced by Hg competition. Copper(II) uptake remains negligible at low pH whereas it increases with pH up to 6 because of material deprotonation. Mercury(II) sorption behaves differently, it slightly changes from pH 1 (qeq: 0.76 mmol g-1) to pH 6 (qeq: 0.84 mmol g-1) due to chloro-anion formation. Therefore, playing with the pH allows separating Hg(II) from Cu(II).
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Submitted on : Tuesday, June 1, 2021 - 1:14:27 PM
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Yayuan Mo, Yue Zhang, Thierry Vincent, Catherine Faur, Eric Guibal. Investigation of mercury (II) and copper (II) sorption in single and binary systems by alginate/polyethylenimine membranes. Carbohydrate Polymers, Elsevier, 2021, 257, pp.117588. ⟨10.1016/j.carbpol.2020.117588⟩. ⟨hal-03101254⟩

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