Superparamagnetic zinc ferrite spinel–graphene nanostructures for fast wastewater purification
2013; Elsevier BV; Volume: 69; Linguagem: Inglês
10.1016/j.carbon.2013.12.019
ISSN1873-3891
AutoresAlireza Meidanchi, Omid Akhavan,
Tópico(s)Nanomaterials for catalytic reactions
ResumoSuperparamagnetic ZnFe2O4/reduced graphene oxide (rGO) composites containing ZnFe2O4 nanoparticles (with ∼5–20 nm sizes) attached onto rGO sheets (with ∼1 μm lateral dimensions) were synthesized by hydrothermal reaction method. By increasing the graphene content of the composite from 0 to 40 wt%, the size as well as the number of the ZnFe2O4 nanoparticles decreased and the saturated magnetization of the composites reduced from 10.2 to 1.8 emu/g, resulting in lower responses to external magnetic fields. Concerning this, the time needed for 90% separation of ZnFe2O4/rGO (40 wt%) composite from its solution (2 mg/mL in ethanol) was found 60 min in the presence of an external magnetic field (∼1 Tesla), while using ZnFe2O4/rGO (15 wt%), only 2 min was required (comparable to the separation time of pure ZnFe2O4 nanoparticles). Correspondingly, the magnetic separation time of 10 μM methyl orange and rhodamine B from aqueous solutions containing 2 mg/mL ZnFe2O4/rGO (15 wt%) was found 16 min).
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