Abstract
In order to realize the heterogeneous phase of complex catalyst, nanoparticles immobilization and expansion application of graphene in the field of photocatalysis, through situ synthesis, graphene @ZnNiAl-LDO composite materials are produced, and with the use of XRD, FTIR, Raman, UV-vis and other characterization methods, this paper explores the differences of situ synthesis ZnNiAl-LDHs and pure ZnNiAl-LDHs structure and morphology in graphene oxide. The results show that the pure ZnNiAl-LDHs shape is micron particles in small disc. However, the situ growing ZnNiAl-LDHs in graphene oxide, its growing process is inhibited by the graphene and thus nano grain is formed. After calcination, the graphene @ZnNiAl-LDO composites were significantly improved compared with the original ZnNiAl-LDO samples in the whole UV-vis range. The absorption experiment showed that the @ZnNiAl-LDO had stronger adsorption performance of Cr(VI). Through the photocatalytic experiments, in MB and Cr (VI) coexisting solution, the visible light photocatalytic degradation rate of MB was significantly higher than that of pure MB solution, and the existence of Cr (VI) has a synergistic effect on graphene /ZnNiAl-LDO composite photocatalytic oxidation organic matter. As a result, it shows that graphene /ZnNiAl-LDO composites can be effectively used in the treatment of organic / heavy metal contaminated water.
