Abstract
Photoactive nanomaterials constitute an emerging field in nanotechnology, finding an extensive array of applications spanning diverse areas, including electronics and photovoltaic devices, solar fuel cells, wastewater treatment, etc. Titanium dioxide (TiO2), in its thin-film form, has been exhaustively surveyed as potential photocatalysts for environmental remediation owing to its innocuousness, stability, and photocatalytic characteristics when subjected to ultraviolet (UV) irradiation. However, TiO2 has some shortcomings associated with a large bandgap value of around 3.2 eV, making it less efficient in the visible spectral range. TiO2 is often consolidated with various carbon nanomaterials to overcome this limitation and enhance its efficiency. Graphene, a 2-dimensional allotrope of carbon with a bandgap tuned between 0 and 0.25 eV, exhibits unique properties, making it an attractive candidate to augment the photoactivity of semiconductor (SC) oxides. Encapsulating graphene oxide onto TiO2 nanospheres demonstrates intensified photocatalytic properties and exceptional recyclability for the degeneration of certain dyes, including Rhodamine B. This review encompasses various techniques to synthesize graphene-based TiO2 photoactive composites, emphasizing graphene capsulized hollow titania nanospheres, nanofibers, core/shell, and reduced graphene oxide-TiO2-based nanocomposites. It also consolidates the application of the aforestated nanocomposites for the disintegration of various synthetic dyes, proving efficacious for water decontamination and degradation of chemicals and pharmaceuticals. Furthermore, graphene-based TiO2 nanocomposites used as lithium (Li)-ion batteries manifesting substantial electrochemical performance and solar fuel cells for energy production are discussed here.
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The authors would like to acknowledge Dr. C. P. Ramanarayanan, Vice-Chancellor of DIAT (DU) Pune, for the motivation and support. The first author is thankful to Dr. V. K. Saxena–Additional Director of Centre for Converging Technologies, University of Rajasthan, Mr. Swaroop Gharde, Mr. Prakash M. Gore, Ms. Shivani Rastogi, Mr. Gaurav Sharma, and Ms. Niranjana Jayaprakash for guidance and technical support. The authors are thankful to the Editor, and anonymous reviewers for improving the quality of the revised manuscript by valuable suggestions, and comments.
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AB performed literature study, data analysis, and technical writing. NM performed data analysis, and technical editing. BK supervised the results, data analysis, and performed the technical revisions of the manuscript. All co-authors read and approved the final manuscript.
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Purabgola, A., Mayilswamy, N. & Kandasubramanian, B. Graphene-based TiO2 composites for photocatalysis & environmental remediation: synthesis and progress. Environ Sci Pollut Res 29, 32305–32325 (2022). https://doi.org/10.1007/s11356-022-18983-9
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DOI: https://doi.org/10.1007/s11356-022-18983-9