期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 23, 期 22, 页码 -出版社
MDPI
DOI: 10.3390/ijms232213741
关键词
antibiotic degradation; hybrid TiO2; Au nanoparticles; visible photocatalysis; water remediation
资金
- Spanish State Research Agency (AEI) [PID2019-106099RB-C43/AEI/10.13039/501100011033]
- Basque Government under the ELKARTEK program
- FCT [2020.02802.CEECIND]
- FCT/PIDDAC through the Strategic Funds [UIDB/04650/2020-2023]
- University of the Basque Country (UPV/EHU)
This study reports a ligand-free synthesis of TiO2:Au nanostars, which expands the light absorption spectral region. Nanoparticles with the smallest branching show the highest photocatalytic degradation under UV and visible radiation.
TiO2:Au-based photocatalysis represents a promising alternative to remove contaminants of emerging concern (CECs) from wastewater under sunlight irradiation. However, spherical Au nanoparticles, generally used to sensitize TiO2, still limit the photocatalytic spectral band to the 520 nm region, neglecting a high part of sun radiation. Here, a ligand-free synthesis of TiO2:Au nanostars is reported, substantially expanding the light absorption spectral region. TiO2:Au nanostars with different Au component sizes and branching were generated and tested in the degradation of the antibiotic ciprofloxacin. Interestingly, nanoparticles with the smallest branching showed the highest photocatalytic degradation, 83% and 89% under UV and visible radiation, together with a threshold in photocatalytic activity in the red region. The applicability of these multicomponent nanoparticles was further explored with their incorporation into a porous matrix based on PVDF-HFP to open the way for a reusable energy cost-effective system in the photodegradation of polluted waters containing CECs.
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