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TiO2 nanoparticles synthesized by pulsed laser ablation in water as catalyst in photodegradation of organic pollutants under UV and visible light irradiation

The pulsed laser ablation in liquid is simple and green method for synthesis of high purity nanoparticles [1]. The Nd:YAG laser at wavelength 1064 nm is used for hitting and ablating the Ti target immersed in water. Interaction between laser pulse (duration 5 ns) and target induces the formation of hot plasma plume above the ablated target, that contains the atoms and ions both from target and surrounding water. The nanoparticles are formed during cooling down of hot plasma plume in the processes of nucleation and condensation. Ablation of Ti target in water leads to formation of colloidal dispersion of TiO2 nanoparticles. SEM revealed that TiO2 nanoparticles are spherical and have Log-Normal size-distribution with maximal diameter at 5 nm and XRD has shown that they are amorphous. After heating treatment of the colloidal dispersion, the TiO2 nanoparticles have crystallized. The photocatalytic tests [2] of non- heated, heated and reference Aeroxide P25 nanoparticles are performed both for UV and visible light. The photodegradation of the Methylene Blue and Diazepam dilluted in the colloidal TiO2 dispersions is monitored. The crystallized TiO2 nanoparticles have shown significantly larger photocatalytic efficiency for visible light when compared to amorphous and P25 nanoparticles, while their photocatalytic efficiency for UV light is slightly better than P25 in the photodegradation of Methylene Blue. XPS revealed the significant presence of Ti3+ atoms in heated TiO2 which have positive impact on photocatalytic efficiency. References [1] N. Krstulovic, K. Salomon, I. Capan and O. Budimlija, Appl. Surf. Sci. 440, 916-925 (2018). ´ [2] D. Blazeka, J. Car, N. Klobucar, A. Jurov, J. Zavasnik, A. Jagodar, E. Kovacevic and N. Krstulovic, Materials. 13, 4357 (2020). ´ Acknowledgments This research was supported by the Croatian Science Foundation under the project HrZZ - PZS- 2019-02-5276

titanium dioxide ; photocatalysis ; laser ablation

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