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Environmental Science and Pollution Research

, Volume 26, Issue 32, pp 32734–32745 | Cite as

Preparation and characterization of photocatalytic Gd-doped TiO2 nanoparticles for water treatment

  • Marwa Ben ChobbaEmail author
  • Mouna Messaoud
  • Maduka L. Weththimuni
  • Jamel Bouaziz
  • Maurizio Licchelli
  • Filomena De Leo
  • Clara Urzì
Green Approaches for Materials, Wastes and Effluents Treatment

Abstract

In recent years, the photocatalytic process by using TiO2 nanoparticles (NPs) has produced a great interest in wastewater treatment due to its interesting features such as low-cost, environmental compatibility, and especially capacity to eliminate persistent organic compounds as well as microorganisms in water. In the present work, the photocatalytic activity of Gd-doped TiO2 nanopowders, with different doping amount 0.1, 1, and 5 mol% synthesized by the sol-gel method, was studied under UV/Visible irradiation for water treatment application. The Gd-doped TiO2 nanoparticles were investigated for their photocatalytic degradation of methylene blue (MB) dye and antibacterial activities against two bacterial strains namely Stenotrophomonas maltophilia (S. maltophilia) and Micrococcus luteus (M. luteus). MB dye was used as a pollutant model to estimate reactive oxygen species (ROS) generation and to correlate killing action of nanoparticles with the generation of ROS. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and Raman spectroscopy were used to characterize the as-synthesized nanomaterials. Photocatalytic, as well as antibacterial tests, showed that doping with an appropriate amount of Gd could reduce the radiative recombination process of photogenerated electron-hole pairs in TiO2 and induce a significant enhancement in photocatalytic and consequently antibacterial activity. The experimental sequence of bactericidal activity and photocatalytic degradation efficiency exhibited by the different gadolinium-doped nanoparticles was the following: 0.1 mol% Gd-doped TiO2 > 1 mol% Gd-doped TiO2 > 5 mol% Gd-doped TiO2 > pure titania.

Keywords

Nanoparticles Gd3+ doped TiO2 Sol-gel Photocatalysis Reactive oxygen species Antibacterial activity 

Notes

Acknowledgements

The authors would like to thank Mrs. Sherron Collins for her careful revision of English text and Dr. Ilenia Tredici, CISRiC-Università di Pavia, for assistance in SEM-EDS analyses.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Laboratory of Industrial Chemistry, National School of EngineeringUniversity of SfaxSfaxTunisia
  2. 2.Department of ChemistryUniversity of PaviaPaviaItaly
  3. 3.Department of Chemical, Biological, Pharmaceutical and Environmental SciencesUniversity of MessinaMessinaItaly

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