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Fabrication of Graphene-Based TiO2@CeO2 and CeO2@TiO2 Core-Shell Heterostructures for Enhanced Photocatalytic Activity and Cytotoxicity.
| Content Provider | Europe PMC |
|---|---|
| Author | Malekkiani, Mitra Ravari, Fatemeh Heshmati Jannat Magham, Abbas Dadmehr, Mehdi Groiss, Heiko Hosseini, Hasan Ali Sharif, Reza |
| Copyright Year | 2022 |
| Abstract | Development of light-harvesting properties and inhibitionof photogeneratedcharge carrier recombination are of paramount significance in thephotocatalytic process. In the present work, we described the synthesisof core–shell heterostructures, which are composed of titaniumoxide (TiO2) and cerium oxide (CeO2) depositedon a reduced graphene oxide (rGO) surface as a conductive substrate.Following the synthesis of ternary rGO-CeO2@TiO2 and rGO-TiO2@CeO2 nanostructures, their photocatalyticactivity was investigated toward the degradation of rhodamine B dyeas an organic pollutant under UV light irradiation. The obtained structureswere characterized with high-resolution transmission electron microscopy,field-emission scanning electron microscopy, energy-dispersive X-rayspectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction,Brunauer–Emmett–Teller, X-ray photoelectron spectroscopysurface analysis, and UV–Vis spectroscopy. Various parametersincluding pH, catalyst dosage, temperature, and contact time werestudied for photocatalysis optimization. Heterostructures showed considerableadvantages because of their high surface area and superior photocatalyticperformance. In contrast, rGO-CeO2@TiO2 showedthe highest photocatalytic activity, which is attributed to the moreeffective electron–hole separation and quick suppression ofcharge recombination at core–shell phases. A biological assayof the prepared heterostructure was performed to determine the cytotoxicityagainst breast cancer cells (MCF-7) and demonstrated a very low survivalrate at 7.65% of cells at the 17.5 mg mL–1 concentrationof applied photocatalyst. |
| Journal | ACS Omega |
| Volume Number | 7 |
| PubMed Central reference number | PMC9435054 |
| Issue Number | 34 |
| PubMed reference number | 36061736 |
| e-ISSN | 24701343 |
| DOI | 10.1021/acsomega.2c04338 |
| Language | English |
| Publisher | American Chemical Society |
| Publisher Date | 2022-08-16 |
| Access Restriction | Open |
| Rights License | Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/). © 2022 The Authors. Published by American Chemical Society |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Chemical Engineering |
