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Efficient removal of congo red dye using Fe 3 O 4 /NiO nanocomposite: Synthesis and characterization

2021; Elsevier BV; Volume: 23; Linguagem: Inglês

10.1016/j.eti.2021.101559

2352-1864

Peyman Koohi, Ahmad Rahbar-Kelishami, Hadi Shayesteh,

Nanomaterials for catalytic reactions

In the present study, the adsorption of congo red (CR) using Fe3O4/NiO magnetic nanocomposites synthesized via a precipitation method was studied. XRD, EDS, FTIR, TEM, BET, and SEM techniques were used to obtain their specifications. The influence of solution pH, adsorbent dosage, time of experiments, initial concentration of CR, and the temperature has been checked. Among the non-linear isotherm models studied, Langmuir with qm=210.78 mg/g at 293 K and R2=0.9983 showed the highest agreement with laboratory results compared to Freundlich, Jovanovic, Halsey, and Temkin models. The results also showed the congo red’s adsorption process on Fe3O4/NiO nanocomposite follows the pseudo-second-order kinetic model. Further, temperature and thermodynamic studies’ effect was carried out, and results showed spontaneously and exothermically the adsorption process. Overall, Fe3O4/NiO nanocomposite, due to low equilibrium time and high adsorption capacity, could remove congo red from contaminated water.