Abstract

Sewage from petrochemical industry usually contains micro/nano crude oil droplets, and forms stable oil in water emulsions. It is difficult to treat efficiently by conventional separation methods. In this paper, Fe3O4 nanoparticles modified with fulvic acid and poly (diallyldimethylammonium chloride) (Fe3O4/FA/PDDA MNPs) were synthesized by a green and economical one-pot co-precipitation method, and used for oil-water separation for hexadecane-water emulsion. Compared with positive charged Fe3O4/FA MNPs, negative charged Fe3O4/FA/PDDA MNPs exhibited better performance for oil-water separation. Combining with the influence of pH on the oil-water separation, the excellent performance of Fe3O4/FA/PDDA MNPs is attributed to its hydrophilicity and surface activity, and the electrostatic attraction between MNPs and the oil droplets simultaneously. Owing to their magnetic recovery performance and stability, Fe3O4/FA/PDDA MNPs maintained 99.8% separation efficiency after 7 cycles of oil-water separation experiments. This result should help to broaden application of MNPs in the treatment of emulsified oil-containing wastewater.

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