Reduced graphene oxide aerogels (RGAs) are excellent candidates for water remediation due to their lightweight, high surface area and high absorbance rate. Here, we report a simple green synthetic approach for the self-assembly of CeO2-RGA aerogels using vitamin-C as the reducing agent. The photocatalytic degradation performance of the as-synthesized CeO2-RGA aerogels was studied as a function of simulated sunlight irradiation, using the organic dye Rhodamine-B (RhB) as a test molecule. The CeO2/RGA composites displayed highly enhanced photocatalytic activity in comparison to bare CeO2nanostructures. This enhancement is ascribed to efficient charge transfer from the CeO2nanostructures to the reduced graphene oxide (RGO) sheets due to the high degree of interconnectivity between the RGO and CeO2nanostructures. In addition, photoluminescence studies strongly support this charge separation mechanism. The microstructures and optical properties of the as-synthesized nanostructures were characterized using HRTEM, XRD, FTIR, XPS and DRS. These results demonstrated that the CeO2nanostructures are grown on interconnected three-dimensional RGO nanosheets. We believe that the findings of this study provide a versatile pathway to induce self-assembly of reduced graphene sheets with other semiconductor nanostructures in the form of lightweight aerogels for a variety of environmental applications.
Bibliographical noteFunding Information:
This work was financially supported by National Research Foundation of Korea (NRF) grants, funded by the Korean government ( MSIP ) ( 2014R1A4A1001690 ). This work was also supported by the 2016 Post-Doc. Development Program of Pusan National University . This research has been supported by in part by Max Planck POSTECH/KOREA Research Initiative Program [Grant No. 2011-0031558 ] through the National Research Foundation of Korea (NRF) funded by Ministry of Science, ICT & Future Planning .
© 2016 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry