Abstract
Hierarchical microspheres of a graphene oxide (GO) coupled to goethite composit were synthesized by hydrothermal and in situ synthesis method, which were named as S-GOF and C-GOF, respectively. The characterisations of the GO, S-GOF and C-GOF were carried out by SEM, XRD, FTIR, XPS, Roman, BET and Zeta potential. The results indicated that the goethite was uniformly loaded onto the surface of GO. The S-GOF and C-GOF composites gave enhancement in photocatalytic activity compared to the pure GO sample, and the photocatalytic activity of C-GOF better than S-GOF and the degradation efficiency of tylosin (TYL) achieved to 84% with simulated sunlight irradiation for 120min. The factors enhancing the photocatalytic performance were the high electron-withdraing ability and high conductivity of goethite and improved visible light-harvesting ability of C-GOF with a hierarchical architecture due to the surface scatring and reflecting effect. Furthermore, the degradation efficiency of C-GOF for TYL decreased with the increase of pH, and C-GOF also exhibited favorable stability and durability.
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