%0 Journal Article %T New derivatives of urea-grafted alginate for improving the sorption of mercury ions in aqueous solutions %+ Université des sciences et de la Technologie d'Oran Mohamed Boudiaf [Oran] (USTO MB) %+ Polymères Composites et Hybrides (PCH - IMT Mines Alès) %+ Université d'Oran 1 Ahmed Ben Bella [Oran] %A A, Benettayeb %A A, Morsli %A Eric, Guibal %A R, Kessas %< avec comité de lecture %J Materials Research Express %I IOP Publishing Ltd %V 8 %N 3 %P 035303 %8 2021-03-01 %D 2021 %R 10.1088/2053-1591/abeabc %K mercury recovery %K chemically-modified alginate beads %K urea-grafting %K sorption isotherms %K uptake kinetics %K multi-metal coexistence %Z Engineering Sciences [physics]Journal articles %X 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. %G English %2 https://imt-mines-ales.hal.science/hal-03167057/document %2 https://imt-mines-ales.hal.science/hal-03167057/file/A_2021_Mater._Res._Express_8_035303.pdf %L hal-03167057 %U https://imt-mines-ales.hal.science/hal-03167057 %~ INSTITUT-TELECOM %~ EM-ALES %~ INSTITUTS-TELECOM