| Full text | |
| Author(s): |
da Silva, Gelson T. S. T.
;
Lopes, Osmando F.
;
Catto, Ariadne C.
;
Patrocinio, Antonio Otavio T.
;
Mesquita, Alexandre
;
Ribeiro, Caue
;
Avansi Jr, Waldir
;
da Silva, Luis F.
Total Authors: 8
|
| Document type: | Journal article |
| Source: | Materials Chemistry and Physics; v. 305, p. 9-pg., 2023-06-01. |
| Abstract | |
We report herein a detailed study on the influence of hydrothermal treatment temperature on both long- and short-range structures of SnO2 nanoparticles (NPs) applied as photocatalysts for the discoloration of organic pollutants and as photoanodes for water splitting. Synchrotron X-ray diffraction and X-ray absorption near-edge spectroscopy measurements confirmed the enhancement of the structural order of SnO2 NPs as a function of hydrothermal temperature. Fourier transform infrared spectroscopy revealed that the hydrothermal treatment increased the amount of hydroxyl groups on the SnO2 NPs surface. Regarding the photocatalytic activity, the NPs were able to promote the discoloration of different dyes that can act as potential organic pollutants. The photoelectrocatalytic performance of the samples depended on the hydrothermal treatment temperature, with the degree of crystallinity and surface hydroxyl groups playing a significant role in their performance as photoanodes. In particular, the NPs treated at a higher temperature presented a better degree of crystallinity, in addition to many hydroxyls on their surface, leading to increased mobility of the photogenerated charge carriers and improving the interaction between the molecules degraded and the material surface. The results demonstrated that the hydroxyls adsorbed on the SnO2 surface favor the formation of hydroxyl radicals, a species that indirectly participate in the photocatalytic oxidation of rhodamine B dye. The photoelectrocatalytic tests showed that the NPs treated at 200 degrees C increased oxygen evolution reaction performance. (AU) | |
| FAPESP's process: | 21/12684-8 - Processing of graphene/Fe2O3 composites: characterization and development of highly performance gas sensors |
| Grantee: | Ariadne Cristina Catto |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |
| FAPESP's process: | 22/10255-5 - Architectures based on metal phosphides and nitrides for photo(electro)chemical conversion of CO2 into C2+ compounds |
| Grantee: | Gelson Tiago dos Santos Tavares da Silva |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 22/02927-3 - Gas sensors based on n-type semiconductors operating at room temperature: investigation of their performance and mechanisms involved |
| Grantee: | Luís Fernando da Silva |
| Support Opportunities: | Research Grants - Initial Project |
| FAPESP's process: | 18/18208-0 - a-Fe2O3/g-C3N4 Heterostructures: Preparation, Characterization and Gas-sensing Properties |
| Grantee: | Ariadne Cristina Catto |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 13/07296-2 - CDMF - Center for the Development of Functional Materials |
| Grantee: | Elson Longo da Silva |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |