Structural selective regulation of Fe3O4@C composite as adsorbent for removing different organic pollutants

• Published in: Separation science and technology 2024-09, Vol.59 (10-14), p.1113-1126
• Main Authors: Chen, Luyao, Ren, Sen, Mao, Kai, Yu, Changyuan, Liu, Yunfang
• Format: Article
• Language: English
• Subjects: Adsorbents; Adsorption; Gasoline; Iron oxides; magnetic adsorbent; Magnetic properties; Magnetite; Magnetite@carbon composite; Microreactors; organic pollutant; Pollutants; Pyrolysis; Recyclability; Rhodamine; Sodium carbonate; Surface properties; Wastewater treatment
• ISSN: 0149-6395; 1520-5754
• DOI: 10.1080/01496395.2024.2366904

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 (Fe 3 O 4 @C) composite was prepared by coupling microreactor and pyrolysis reactor. The structures and surface properties of the Fe 3 O 4 @C were effectively adjusted by changing the pyrolysis temperature and Na 2 CO 3 concentration. The Fe 3 O 4 @C composite prepared at 800°C of pyrolysis temperature with 1 mol·L −1 of Na 2 CO 3 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 Fe 3 O 4 @C synthesized at 500°C with 1 mol·L −1 of Na 2 CO 3 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. Fe 3 O 4 @C can be easily separated from wastewater and simply regenerated with less capacity loss after five cycles. The results show that the Fe 3 O 4 @C prepared by this method could be suitable for the removal of different OPs by adjusting the preparation conditions. Magnetic adsorbents Fe 3 O 4 @C were prepared by coupling microreactor and pyrolysis reactor. Structure and property of Fe 3 O 4 @C were effectively controlled by adjusting reaction parameters. Fe 3 O 4 @C composite exhibits outstanding adsorption performances for different organic pollutants. Fe 3 O 4 @C composite shows excellent recyclability and reusability. The adsorption kinetics fitted the pseudo-second-order model.