Graphene-based TiO2 composites for photocatalysis & environmental remediation: synthesis and progress

• Published in: Environmental science and pollution research international Vol. 29; no. 22; pp. 32305 - 32325
• Main Authors: Purabgola, Anushka, Mayilswamy, Neelaambhigai, Kandasubramanian, Balasubramanian
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.05.2022; Springer Nature B.V
• Subjects: Allotropy; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Carbon; Chemical degradation; Decontamination; Degeneration; Disintegration; drugs; Dyes; Earth and Environmental Science; Ecotoxicology; Electrochemical analysis; Electrochemistry; Electronic waste; electronics; energy; Energy gap; Environment; Environmental Chemistry; Environmental cleanup; Environmental Health; Environmental restoration; Environmental science; Fuel cells; Fuel technology; Graphene; graphene oxide; Irradiation; Lithium; Nanocomposites; Nanofibers; Nanomaterials; Nanospheres; Nanotechnology; Photocatalysis; photocatalysts; Photovoltaic cells; Photovoltaics; Recyclability; Remediation; Review Article; Rhodamine; rhodamines; semiconductors; Solar energy; Thin films; Titanium dioxide; Ultraviolet radiation; Waste Water Technology; Wastewater treatment; Water Management; Water Pollution Control; Synthetic dyes; Graphene nanomaterials; Titanium dioxide; Wastewater treatment; Li-ion batteries; Photocatalysis
• ISSN: 0944-1344; 1614-7499; 1614-7499
• DOI: 10.1007/s11356-022-18983-9

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 (TiO 2 ), 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, TiO 2 has some shortcomings associated with a large bandgap value of around 3.2 eV, making it less efficient in the visible spectral range. TiO 2 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 TiO 2 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 TiO 2 photoactive composites, emphasizing graphene capsulized hollow titania nanospheres, nanofibers, core/shell, and reduced graphene oxide-TiO 2 -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 TiO 2 nanocomposites used as lithium (Li)-ion batteries manifesting substantial electrochemical performance and solar fuel cells for energy production are discussed here. Graphical abstract