Abstract
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 150mgL-1, for RB5 dye is 115mgL-1, and for BB dye is 75mgL-1. The sedimentation time decreased from 30 to 5min with magnetic sedimentation. The residual value of AM dye decreased from 10.76mgL-1 to approximately 2.71mgL-1, and with SY the residual concentration decreased from approximately 16.79mgL-1 to 6.36mgL-1. The removal of BB and RB5 dyes reached an approximate final value of 48.2mgL-1 (52%) and 1.18mgL-1 (94%).
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