Magnetic Fe₃O₄@G-C₃N₄ Nanocomposites for Visible Light Photocatalysis of RhB

Abstract

Abstract. Visible light-responsive Fe 3 O 4 @g-C 3 N 4 nanocomposites were prepared by hydrothermal method with g-C 3 N 4 nanosheets as the substrates. The photocatalytic performances of the Fe 3 O 4 @g-C 3 N 4 nanocomposites were evaluated in photo Fenton-like discoloration of RhB dye using H 2 O 2 as an oxidant under visible-light irradiation. Meanwhile, the reusability and magnetic properties were also investigated. The results revealed that the Fe 3 O 4 @g-C 3 N 4 nanocomposites showed considerable photocatalytic activity, and exhibited excellent reusability with almost no change after four runs, and more importantly, Fe 3 O 4 @g-C 3 N 4 nanocomposites could be recovered magnetically. Therefore, the fabricated Fe 3 O 4 @g-C 3 N 4 nanocomposite photocatalyst is a promising candidate for energy conversion and environmental remediation.

Novel Magnetic Retrievable Visible-Light-Driven Ternary Fe3O4@NiFe2O4/Phosphorus-Doped g-C3N4 Nanocomposite Photocatalyst with Significantly Enhanced Activity through a Double-Z-Scheme System

“…The criteria of exothermic measures were taken into account for the related heat-flow effects. The endothermic affair from 25 to 400 °C could be ascribed for the physical adsorption and removal of crystallized H 2 O, from both the interlayer space and outer surface . Again, as was already reported by Deng et al, the decomposition of hydroxides and carbonates that occurs between 400 and 800 °C as a second event is also endothermic, as shown in Figure a .…”

“…The two enlarged broadening bands almost centered around 3367 and 1638 cm –1 belong to the stretching and bending vibrations of the O–H groups, respectively. , This finding specifies the existence of crystal H 2 O in the compound . The distinctive bands in the area ranging from 1240 to 1640 cm –1 are assigned to either the bridging C–NH–C or trigonal C–N­(−C)–C units (full condensation) . The P–N stretching vibration in NFOPCN is well identified by a feeble peak present at 950 cm –1 .…”

“…This confirms that the coupling of M with NFOPCN increases the thermal stability. The presence of NFO and P-CN may be responsible for the relatively low decomposition temperature in comparison to pure CN . Hence, it is concluded that the stability of M is retained.…”

“…The weak typical low-frequency peak at 560 cm –1 is ascribed to Fe–O stretching in the tetrahedron and the band at 608 cm –1 to metal–oxygen deformation in the octahedron. The possibility of formation of other phases for M could also be eliminated because the existence of a Fe–O vibrational mode at 560 cm –1 is only ascribed to the M magnetite phase, whereas the band at 470 cm –1 typical for γ-Fe 2 O 3 is absent. , Further, in the case of pure M, the peak at 586 cm –1 is ascribed to the symmetric stretching vibration of the Fe–O band in the tetrahedral FeO 6 groups of spinel-type compounds . It is also observed that all of the main distinctive peaks of NFOPCN and M are well maintained in the M@NFOPCN composite spectra, further confirming the evidence of NFO and M on the surface of P-CN.…”

“…9 The distinctive bands in the area ranging from 1240 to 1640 cm −1 are assigned to either the bridging C−NH−C or trigonal C−N(−C)−C units (full condensation). 34 The P−N stretching vibration in NFOPCN is well identified by a feeble peak present at 950 cm −1 . 10 Again, the sharp peak located at 810 cm −1 can be related to the breathing vibration of the typical s-triazine ring.…”