Application of magnetic coagulant based on fractionated protein of Moringa oleifera Lam. seeds for aqueous solutions treatment containing synthetic dyes
2020
Reck, Isabela Maria | Baptista, Aline Takaoka Alves | Paixão, Rebecca Manesco | Bergamasco, Rosângela | Vieira, Marcelo Fernandes | Vieira, Angélica Marquetotti Salcedo
The aim of the present study was to evaluate the efficiency of a new magnetic coagulant, obtained from Moringa oleifera seeds protein functionalized with iron oxide nanoparticles to remove four anionic synthetic dyes with coagulation/flocculation assays followed by magnetic sedimentation. The results showed that the presence of a magnetic field during sedimentation considerably accelerates the separation and increases the dye removal efficiency. Amaranth dye removal increased from 45 to 86% and Sunset Yellow from 15 to 69% with the presence of magnetic field, while Reactive Black 5 and Brilliant Blue reached 94% and 52% removal, respectively. For AM and SY dyes, the best protein concentration is 150 mg L⁻¹, for RB5 dye is 115 mg L⁻¹, and for BB dye is 75 mg L⁻¹. The sedimentation time decreased from 30 to 5 min with magnetic sedimentation. The residual value of AM dye decreased from 10.76 mg L⁻¹ to approximately 2.71 mg L⁻¹, and with SY the residual concentration decreased from approximately 16.79 mg L⁻¹ to 6.36 mg L⁻¹. The removal of BB and RB5 dyes reached an approximate final value of 48.2 mg L⁻¹ (52%) and 1.18 mg L⁻¹ (94%).
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