ABSTRACT
Many wastewater treatment methods have been developed because large amounts of organic pollutants (OPs) entered into the water bodies and adsorption is one of the classic and important technologies. Recently, magnetic adsorbents have garnered extensive attention due to the high efficiency and distinctive recyclability. The control of their structures and surface properties is crucial. Here, the magnetite@carbon (Fe3O4@C) composite was prepared by coupling microreactor and pyrolysis reactor. The structures and surface properties of the Fe3O4@C were effectively adjusted by changing the pyrolysis temperature and Na2CO3 concentration. The Fe3O4@C composite prepared at 800°C of pyrolysis temperature with 1 mol·L−1 of Na2CO3 concentration has lipophilicity and the highest adsorption capacity of 92# gasoline among those adsorbents, which is as high as 7.6 g·g−1. The Fe3O4@C synthesized at 500°C with 1 mol·L−1 of Na2CO3 concentration has hydrophilicity and the highest adsorption capacity of Rhodamine B and Methyl Blue. The saturated adsorption capacities are about 166 and 301 mg·g−1, respectively. Fe3O4@C can be easily separated from wastewater and simply regenerated with less capacity loss after five cycles. The results show that the Fe3O4@C prepared by this method could be suitable for the removal of different OPs by adjusting the preparation conditions.
HIGHLIGHTS
Magnetic adsorbents Fe3O4@C were prepared by coupling microreactor and pyrolysis reactor.
Structure and property of Fe3O4@C were effectively controlled by adjusting reaction parameters.
Fe3O4@C composite exhibits outstanding adsorption performances for different organic pollutants.
Fe3O4@C composite shows excellent recyclability and reusability.
The adsorption kinetics fitted the pseudo-second-order model.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Supplemental data
Supplemental data for this article can be accessed online at https://doi.org/10.1080/01496395.2024.2366904.