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The photo-transformation of graphene oxide (GO) nanosheet and the photo-reduction of uranyl ion (U(VI)) have been widely studied separately. However, little attention has been given to the simultaneous photo-degradation of GO nanosheets and the photochemical reduction of U(VI) under ultraviolet (UV) illumination. In this study, the relationships among the UV-induced degradation of GO, the U(VI)-induced aggregation of GO, the adsorption of U(VI) on GO, and the UV-induced reduction of U(VI) as well as their roles in the UV-induced simultaneous photo-degradation of GO and photo-reduction of U(VI) were elucidated. These results indicated that the UV-induced transformation of GO occurred more quickly than the adsorption of U(VI) on GO. The presence of low concentration of U(VI) could promote the UV-induced transformation of GO at the initial stage, while UV irradiation weaken the efficiency of U(VI) ions in destabilizing GO nanosheets at the subsequent stage. Our findings are crucial for developing a highly efficient method to accomplish the simultaneous removal of GO and U(VI) in the actual environmental cleanup. [Display omitted] [ABSTRACT FROM AUTHOR]

Graphical abstract Hybrid CF@C-Ni has been synthesized by an extended Stöber approach combined with a pyrolysis process, which was convenient to collect and recycle during the application. Highlights • Hybrid CF@C-Ni can be easily obtained with an extended stöber approach and subsequent carbonization treatment in nitrogen atmosphere. • The size and density of nickel NPs on the carbon fabric could be finely controlled by adjusting the carbonization temperature. • The nickel NPs endowed the CF@C-Ni composites with magnetism, exhibiting catalytic performance on the reduction of 4-NP. • The hybrid CF@C-Ni can be easily recycled in the catalytic process due to its cloth structure. Abstract One-dimensional (1D) carbon fabric (CF) anchored with high-density of nickel nanoparticles (NPs) has been successfully fabricated by combining an extended Stöber approach with a carbonization process. Hybrid CF@PDA-Ni2+ was first synthesized by the coating of the polydopamine-Ni2+ (PDA-Ni2+) layer on carbon fabric in a Stöber condition. After carbonizing in an inert atmosphere, the CF@C-Ni hybrid in which plenty of Ni NPs embedded in PDA-derived carbon shell on carbon fabric was obtained. Thus, the prepared CF@C-Ni composites can be employed as the catalyst for the reduction of 4-nitrophenol (4-NP). Additionally, the size and density of Ni NPs could be finely controlled via changing the carbonization temperature. Moreover, the CF@C-Ni composites can be easily collected and recycled with little loss because of their unique structures, which is important for practical applications. [ABSTRACT FROM AUTHOR]