| Full text | |
| Author(s): |
Bernardes, Andre A.
;
da Silva, Andre L.
;
Ramos, Bruno
;
Fonseca, Fabio C.
;
Gouvea, Douglas
Total Authors: 5
|
| Document type: | Journal article |
| Source: | INTERNATIONAL JOURNAL OF CERAMIC ENGINEERING AND SCIENCE; v. 5, n. 5, p. 11-pg., 2023-09-01. |
| Abstract | |
Defect formation during synthesis is one of the strategies used to improve the photoactivity of polycrystalline semiconductors such as titanium dioxide (TiO2). Defects can modify the electronic structure of TiO2 and change the surface of the interaction between the photocatalyst and the reactants. In this study, TiO2 relationship between processing in the presence of iodine and the consequent formation of intrinsic defects were explored. TiO2 nanoparticles were synthesized using the polymeric precursor method and exposed to iodine ions at concentrations up to 5 mol%. After calcination at 350 degrees C, detailed chemical analyses revealed that iodine was absent in the samples. However, the TiO2 properties, such as specific surface area, crystallite sizes, and specific grain boundary area, were affected. Further experiments, such as electron paramagnetic resonance, diffuse reflectance, optical measurements, and electrochemical impedance spectroscopy indicated the presence of defects in the iodine-processed samples. These defects directly influenced the electrical properties of the material, which affected the photoactivity, measured by the degradation of acetaminophen. (AU) | |
| FAPESP's process: | 19/10109-6 - Nanoparticle interfaces design of semiconducting oxides for artificial photosynthesis |
| Grantee: | Douglas Gouvêa |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 14/50279-4 - Brasil Research Centre for Gas Innovation |
| Grantee: | Julio Romano Meneghini |
| Support Opportunities: | Research Grants - Research Centers in Engineering Program |
| FAPESP's process: | 17/11937-4 - A sustainable path to methane conversion by advanced electrochemical technologies |
| Grantee: | Fabio Coral Fonseca |
| Support Opportunities: | Research Grants - Research Centers in Engineering Program |
| FAPESP's process: | 20/15230-5 - Research Centre for Greenhouse Gas Innovation - RCG2I |
| Grantee: | Julio Romano Meneghini |
| Support Opportunities: | Research Grants - Research Centers in Engineering Program |