Adsorptive removal of aflatoxin B1 from contaminated peanut oil via magnetic porous biochar from soybean dreg

The contamination of mycotoxin in edible oil has always been a major threat to human health. In this study, magnetic soybean dreg-based biochar SDB-6-K-9@Fe3O4 was prepared via co-precipitation and used to remove aflatoxin B1 (AFB1) from contaminated oil. The adsorbent characterization results revealed that the Fe3O4 was successfully loaded to the SDB-6-K-9. The 0.45SDB-6-K-9@Fe3O4 had paramagnetic properties with a saturation magnetization of 45.15 emu/g, which could be quickly separated from the peanut oil using an external magnet. The maximum adsorption capacity of peanut oil contaminated with 200 ng/mL AFB1 by 50 mg 0.45SDB-6-K-9@Fe3O4 for 2 h reached 0.1354 mg/g, while the removal process minimally affected the quality of the oil. The adsorption behavior results followed a pseudo-second-order kinetic and fitted well with the Freundlich model. The excellent adsorption removal efficiency and facile magnetic separation of the adsorbents provide a simple and efficient method for removing contaminants from the oil.

Automated summary

A magnetic soybean dreg-based biochar was prepared and used to effectively remove aflatoxin B1 from contaminated oil. The adsorbent demonstrated paramagnetic properties and could be easily separated from the oil using an external magnet. The removal process had minimal impact on the oil quality, and the adsorption behavior followed a pseudo-second-order kinetic and Freundlich model. This study provides a simple and efficient method for removing contaminants from oil.