Improved photocatalytic and antibacterial performance of Cr doped TiO2 nanoparticles
| Autor: | D. Muñoz, A. Muela, M. L. Fdez-Gubieda, Ana García-Prieto, L. Rodríguez Fernández, Cristina Gomez-Polo, L. Fernández Barquín, S. Larumbe, Antonio Gil |
|---|---|
| Přispěvatelé: | Universidad Pública de Navarra. Departamento de Ciencias, Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa. INAMAT2 - Institute for Advanced Materials and Mathematics, Nafarroako Unibertsitate Publikoa. Zientziak Saila |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Tio2 nanoparticles Doped titanium oxide General Physics and Astronomy Nanoparticle Nanotechnology Cr doped 02 engineering and technology Surfaces and Interfaces General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Antibacterial Photocatalysis Nanoparticles 0210 nano-technology Sol-gel method Sol-gel |
| Popis: | The effect of Cr and N doping in the adsorption capacity, photocatalytic properties and antibacterial response of TiO2 anatase nanoparticles is analyzed. The nanoparticles (N-TiO2, Cr-TiO2 and Cr/N-TiO2) were prepared by the sol-gel method. The structural (X-ray diffraction and TEM) and magnetic (SQUID magnetometry) characterization confirms the nanosized nature of the anatase nanoparticles and the absence of secondary phases. The enhancement of the adsorption capacity of the dye (methyl orange) on the surface of the catalysts for the Cr and Cr/N doped samples, together with the redshift of the UV-Vis absorbance spectra promote a high photocatalytic performance under visible light in these nanocatalysts. The culturability and viability of the Escherichia coli DH5α in a medium supplemented with the nanoparticles was characterized and compared with the evolution under visible light (both without and with nanoparticles). The results show that Cr-TiO2 nanoparticles under visible light display antibacterial activity that cannot be accounted by the toxicity of the nanoparticles alone. However the antibacterial effect is not observed in N-TiO2 and Cr/N-TiO2. The differences in the electrostatic charge (isoelectric point) and the degree of nanoparticle dispersion are invoked as the main origins of the different antibacterial response in the Cr-TiO2 nanoparticles. The Spanish and Basque Governments are acknowledged for funding under projects MAT2017-83631-C3-R and IT-1245-19, respectively. A. Gil is also grateful for financial support from Santander Bank through the Research Intensification Program. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|