Applications of Fe3O4@AC nanoparticles for dye removal from simulated wastewater

• Published in: Chemosphere (Oxford) Vol. 236; p. 124280
• Main Authors: Joshi, Seema, Garg, V.K., Kataria, Navish, Kadirvelu, K.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-12-2019
• Subjects: Brilliant green; Co-precipitation; Isotherms; Kinetics; Methylene blue; Kinetics; Isotherms; Co-precipitation; Brilliant green; Methylene blue
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2019.07.011

This study deals with the removal of cationic dyes from the simulated wastewater using Fe3O4 nanoparticles loaded activated carbon. Fe3O4@AC nanoparticles were synthesised using co-precipitation methods. The Fe3O4@AC nanoparticles (nps) were characterised using different techniques and data revealed that the synthesised nanoparticles were 6–16 nm in diameter. pHpzc of Fe3O4@AC nanoparticles was 7.8. BET surface area of Fe3O4@AC nps was found to be 129.6 m2/g by single point method and 1061.9 m2/g by multipoint method. Adsorption experiments were performed to optimize the effect of process conditions such as pH of solution, nanoparticles dose, temperature, concentration of dye and contact time on contaminant removal. The maximum uptake capacity of Fe3O4@AC was found to be 138 and 166.6 mg/g for methylene blue and brilliant green dyes, respectively. In order to assess dye adsorption behaviour, adsorption isotherm models viz., Langmuir, Freundlich and Temkin were applied to the data. Langmuir isotherm best fitted [R2 = 0.993 (MB) and R2 = 0.920 (BG)] to the experimental data of both the dyes. Further, Pseudo-second order rate equation fitted better to the experimental data. Reuse potential of the nanoparticles was also investigated for the removal of both the dyes and it is inferred from the data that the synthesised nanoadsorbent has promising reuse potential, therefore can be used for several cycles.
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•Fe3O4@AC nanoparticles were synthesised by co-precipitation methods for basic dye adsorption.•Maximum adsorption capacity of Fe3O4@AC was 138 mg/g for MB and 166.6 mg/g for BG dye.•Adsorption isotherms and kinetic and thermodynamic studies were also performed.•Reusable potential of adsorbent was also evaluated upto several cycles.