Retraction Note to: Amine functionalized magnetic nanoparticles for removal of oil droplets from produced water and accelerated magnetic separation

Magnetic nanoparticles (MNPs) with surface coatings designed for water treatment, in particular targeted removal of contaminants from produced oil fields, have drawn considerable attention due to their environmental merit. The goal this study was develop an efficient method removing very stable, micron-scale droplets dispersed oilfield water. We synthesized MNPs the laboratory a prescribed coating. were superparamagnetic magnetite, and hydrodynamic size amine functionalized ranges 21 255 nm average 66 nm. initial content 0.25 wt.% reduced by as much 99.9% separated electrostatic attraction between negatively charged oil-in-water emulsions positively controls, attachment droplet surface, subsequent aggregation electrically neutral attached (MNPs-oils) play critical role accelerated magnetic separation. total separation time dramatically short 1 s after MNPs, mixed, contrast case free, individual which took about 36∼72 h, depending on MNP concentrations. Model calculations velocity, accounting magnetization viscous drag, show that will be approximately 5 min or less, when MNPs-oils is greater than 360 nm, can used optimum operating condition.