Simultaneous precipitation and discharge plasma processing for one-step synthesis of α-Fe(2)O(3)–Fe(3)O(4)/graphene visible light magnetically separable photocatalysts

A novel facile combination of precipitation and plasma discharge reaction is successfully employed for one-step synthesis of an α-Fe(2)O(3)–Fe(3)O(4) graphene nanocomposite (GFs). The co-existence and anchoring of hematite (α-Fe(2)O(3)) and magnetite (Fe(3)O(4)) nanoparticles onto a graphene sheet in the as synthesized GFs were verified by results of XRD, Raman, SEM, TEM, and XPS. HRTEM characterization was used for confirming the bonding between α-Fe(2)O(3)/Fe(3)O(4) nanoparticles and the graphene sheet. Consequently, GFs shows superior photodegrading performance towards methylene blue (MB), compared to individual α-Fe(2)O(3)/Fe(3)O(4) nanoparticles, as a result of band gap narrowing and the electron–hole pair recombination rate reducing. Moreover, GFs allows a good possibility of separating and recycling under an external-magnetic field, suggesting potential in visible-light-promoted photocatalytic applications.