Synthesis Of Graphene/Metallophthalocyanine Hybrid And Its Visible-Light-Assisted Degradation Of Phenol

As a new member of carbon materials, graphene, due to its outstanding physical property, serves as conductive material and composite material. Metallophthalocyanine, owing to the favorable visible-light absorption and photoelectric property, is applied to be light-sensitive material. Graphene and phthalocyanine, both of which have planar construction, combine into hybridization through ?-? stacking interaction constituting the electron donor-acceptor system, and phthalocyanine acts as electron donor, and graphene acts as electron acceptor. The hybridization style not only increases the dispersity of the phthalocyanine on graphene, but also promotes further exfoliation of the graphene. Compared with alone graphene and phthalocyanine, the hybridization presents an enhanced degradation rate of phenol. The sections in this work can be concluded as followed:?1? The non-substituent iron?II? phthalocyanine, rod-like structure with diameter of 25 nm, 100 nm long, is obtained by solid-phase synthesis. Graphene oxide is prepared by modified Hummers' method, and then graphene oxide is reduced using hydrazine hydrate as reductant to obtain graphene, which presents a typical wrinkle morphology. The as-prepared graphene/iron?II? phthalocyanine hybrid is characterized by UV-Vis absorption spectra, FTIR, Raman spectra, and XRD, the results show that there is ?-? stacking interaction between graphene and phthalocyanine, which is contributing to the electron transfer from phthalocyanine to graphene.?2? Phenol is chosen as the target pollutant to evaluate the photocatalytic property of the hybrid. Compared with Cs/FePc and Al₂O₃/FePc, G/FePc shows the best degradation activity in the presence of H2O2 with visible light irradiating for 3 h. And the hybrid containing 25 wt.% FePc is the optimal photocatalyst and the apparent degradation rate achieves 77.1%, but other photocatalysts show a low degradation activity for phenol in the identical condition. Moreover, G/FePc hybrid shows a proper decomposition ability to hydrogen peroxide, making the generation rate of the hydroxyl radical match with the degradation rate of phenol.?3? Because of the effect of central metal on phthalocyanine, phthalocyanines with different central metal, CoPc, NiPc, CuPc?MePcs? and the corresponding hybrids are discussed based on a series of characterization data. The morphologies and the physical and chemical properties of the MePcs have a big difference from FePc. The phthalocyanines have an equivalent size to graphene, which decreases the dispersity of MePc on graphene, resulting the diminishment of the contact area between graphene and MePc, the interaction force declining sharply, thus making the photocatalysts aggregating seriously, the photo-generated charges recombining and the separation efficiency of charges decreasing dramatically. And the specific surface area of MePcs and G/MePcs is smaller than Fe Pc and G/FePc, respectively, so the former photocatalysts are not liable to absorb pollutant.