A magnetically recoverable CaTiO₃/reduced graphene oxide/NiFe₂O₄ nanocomposite for the dye degradation under simulated sunlight irradiation

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In this work, ternary CaTiO₃/reduced graphene oxide (rGO)/NiFe₂O₄ nanocomposite was successfully prepared using polyacrylamide gel route followed by hydrothermal method. It is observed that NiFe₂O₄ and CaTiO₃ nanoparticles are assembled on the surface of rGO. Furthermore, the formation of chemical bonding between the nanoparticles and rGO is confirmed. The photocatalytic activities of the samples were evaluated through the degradation of methylene blue and rhodamine B under the simulated sunlight irradiation. The results indicate that the ternary nanocomposite exhibits remarkable enhanced photocatalytic activity compared with bare CaTiO₃ and NiFe₂O₄. In this nanocomposite, the photogenerated electrons of CaTiO₃ and NiFe₂O₄ can be captured by rGO, leading to an increased separation and availability of electrons and holes for the photocatalytic reaction. Moreover, this nanocomposite exhibits obvious ferromagnetism and can be readily recovered by external magnetic field. The recycling photocatalytic experiment demonstrates that the nanocomposite possesses good photocatalytic reusability.