New ways to use the red mud waste as raw material for inorganic- organic hybrid hydrogels

Sandu, Teodor; Sârbu, Andrei; Zăvoianu, Rodica; Spatarelu, Catalina-Paula; Florea, Mihaela; Bradu, Corina; Mara, Eleonora Luminita; Dragut, Dumitru Valentin; Alexandrescu, Elvira; Zaharia, Anamaria; Radu, Anita Laura

doi:10.1016/j.minpro.2017.11.005

Cited by 3 publications

(1 citation statement)

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“…46 The use of red mud for water amendment was also investigated in a previous study by our group. 47 Monier et al describe the removal of nickel ions through an azofunctionalized non-imprinted polymeric resin, produced starting from resorcinol. 48 In another study nickel ions were removed using a porous organic triazine-based network, developed from 2,4,6-tris(hydrazine)-s-triazine and 3,4,9,10perylenetetracarboxylic dianhydride.…”

Section: Introductionmentioning

confidence: 99%

Advanced hybrid membranes for efficient nickel retention from simulated wastewater

Sandu

Chiriac

Tsyntsarski

et al. 2021

Polymer International

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This paper describes the preparation of a new type of hybrid material suitable to be used for the amendment of wastewaters laden with Ni ions relying on two purification principles, mechanical and adsorption. The membranes were prepared using as first component copolymers of acrylonitrile with vinyl acetate, acrylic acid or methacrylic acid. The second component of the developed membranes consisted of powdered activated carbon (PAC), of natural or synthetic origin, used in a content of either 4% or 8%. In this way, separation based on porosity is combined with the adsorptive properties of PAC. Hybrid membranes, prepared by phase inversion, were fully characterized by Fourier transform IR (FTIR) spectroscopy, pure water flux analysis, TGA, SEM, Brunauer-Emmett-Teller analysis and XRD. Moreover, water amendment was also investigated using synthetic water bearing heavy metals, in our case nickel, a laboratory electrodialysis set-up being used for this purpose. FTIR revealed that the use of PAC led to several peaks at low wavelength (900-650 cm −1 ). Pure water flux values vary in a fairly wide range, from 0.02 to almost 1.00, depending on the preparation conditions. It can be concluded that the final properties of the developed membranes may be adjusted by changing either the copolymer or the PAC. An additional control is provided by the amount of PAC. The developed membranes were found to achieve an enhanced release of Ni ions, as the percentage of extraction was at least 51%.

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Section: Introductionmentioning

confidence: 99%