Influence of RGO/TiO$_2$ nanocomposite on photo-degrading Rhodamine B and Rose Bengal dye pollutants

Bulletin of Materials Science

A ROSY^1¹ 

[1] Department of Physics, Anna University, Chennai 600 025, India^1

关键词: Ultrasonication;    RGO/mixed phases TiO$_2$;    sonophotocatalytic treatment;    sunlight irradiation;    RhB and RB dye degradation.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Reduced graphene oxide/titanium oxide-nanostructured composite (RGO/TiO$_2$) was prepared by combining Hummer’s synthesized graphene oxide and solvothermally synthesized TiO$_2$ nanoparticles (TiO$_2) through a facile ultrasonication-mediated mechanical mixing method. Structural and morphological evidences from XRD and SEM results confirmed that the as-prepared TiO$_2$ composed of mixed phases, anatase phase with body centred tetragonal crystal structured prism-like architecture, rutile phase with primitive tetragonal crystal-structured bipyramid-like architecture and hence,RGO/TiO2 system exhibited the similar structural and morphological features. Band gap energy of RGO/TiO$_2$ was reduced from 2.98 to 2.91 eV due to the presence of RGO and hence, the light absorption range was extended to visible region. In addition, RGO acted as the electron acceptor and hence, the separation efficiency of photo-generated electron–hole pairs increased effectively, and this prevented the recombination process in RGO/TiO$_2$ system. Thus, RGO/TiO$_2$ system exhibited greater efficiency towards degrading Rhodamine B (RhB) and Rose Bengal (RB) dye pollutants than bare TiO$_2$ under sonophotocatalytic condition with natural sunlight irradiation. The possible mechanisms responsible for the enhanced efficiency are explained in this study using appropriate characterization techniques.

【 授权许可】

CC BY