Adsorption–desorption behavior of magnetic amine/Fe3O4 functionalized biopolymer resin towards anionic dyes from wastewater

• Magnetic amine/Fe3O4 functionalized biopolymer resin was prepared for dye uptake.
• The characters of resin were determined by VSM, TGA, XRD, SEM, TEM, FT-IR and XPS.
• This novel amine/Fe3O4-resin could achieve rapid separation from effluents.
• Chemical regeneration of the saturated amine/Fe3O4-resin was conducted.
• The adsorption followed the pseudo second order model and Langmuir model.

In this work, a new kind of magnetic amine/Fe3O4 functionalized biopolymer resin (amine/Fe3O4-resin) was prepared and applied to remove various anionic dyes from water. Methyl Orange (MO), Reactive Brilliant Red K-2BP (RBR) and Acid Red 18 (AR) were selected as the typical anionic dye for this research. Meanwhile, amine/Fe3O4-resin was characterized by VSM, XRD, FT-IR, SEM, TEM and XPS. Three anionic dyes removed by amine/Fe3O4-resin were investigated using batch adsorption technique, and the parameters including adsorbent dosage, pH, contact time and temperature were considered. Due to a large number of amine groups and high surface areas, amine/Fe3O4-resin exhibited a remarkably high adsorption capacity for all three dyes, reaching 101.0 mg/g, 222.2 mg/g and 99.4 mg/g for RBR, MO and AR at 25 °C, respectively. The pseudo second order model and Langmuir model agreed well with the experimental data, and regeneration experiments indicated its merit of separability and reusability.

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