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New derivatives of urea-grafted alginate for improving the sorption of mercury ions in aqueous solutions

Abstract : Chemically-modified alginate (obtained by grafting urea on alginate, with different ratios; alginate-urea (1:1) and its new derivatives alginate-urea (1:2) with an exceed of the percent of amino group by 7%) was successfully tested for mercury sorption in aqueous solutions. The influence of pH on metal sorption was first investigated: optimum pH was close to 5.5. Sorption isotherms were modeled using the Langmuir and the Sips equations, and sorption capacity slightly increased with the increased of the % of-NH 2 in the sorbent and the maximum sorption capacity exceeded 200 mg Hg l −1 (1.07 mmol Hg g −1 ; for alginate-urea (1:2)), this means two times the sorption capacity of reference material (i.e., nonmodified alginate), and also has a capacity improved compared to alginate-urea (1:1). Under selected experimental conditions the equilibrium was reached with 6-8 h of contact and the kinetic profiles were modeled using the pseudo-first order equation (PFORE), the pseudo-second-order rate equation (PSORE) and the resistance to intraparticle diffusion (RIDE). Surface functional groups, notably;-NH 2 ,-OH and-COOH, were involved in mercury sorption by alginate-urea, suggesting the ion exchange, complexation and/or electrostatic interaction of Hg(II) on the alginate-urea surface. The use of this material, environmentally friendly and simply obtained from a renewable resource, reveals promising for the treatment of low-metal concentration effluents: sorption capacities are comparable to alternative academic and commercials sorbents.
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Submitted on : Thursday, March 11, 2021 - 5:00:31 PM
Last modification on : Tuesday, August 17, 2021 - 5:21:46 PM
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Benettayeb A, Morsli A, Guibal Eric, Kessas R. New derivatives of urea-grafted alginate for improving the sorption of mercury ions in aqueous solutions. Materials Research Express, IOP Publishing Ltd, 2021, 8 (3), pp.035303. ⟨10.1088/2053-1591/abeabc⟩. ⟨hal-03167057⟩



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