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Fe-TiO_2 nanoparticles synthesized by green chemistry for potential application in waste water photocatalytic treatment

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Solano, Ricardo A. and Herrera, Adriana P. and Maestre Varea, David and Cremades Rodríguez, Ana Isabel (2019) Fe-TiO_2 nanoparticles synthesized by green chemistry for potential application in waste water photocatalytic treatment. Journal of nanatechnology . ISSN 1687-9503

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Official URL: http://dx.doi.org/10.1155/2019/4571848


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Abstract

Anatase TiO_2 nanoparticles doped with iron ions have been synthesized via the green chemistry method using aqueous extract of lemongrass (Cymbopogon citratus) obtained from Soxhlet extraction and doped by wet impregnation. The TiO_2 anatase phase has been doped with Fe^3+ (0.05, 0.075, and 0.1 Fe^3+ : Ti molar ratio) at 550 degrees C and 350 degrees C, respectively. The scanning electron microscopy with energy-dispersive X-ray (SEM-EDS) shows nanoparticle clusters and efficiencies of impregnations between 66.5 and 58.4% depending on the theoretical dopant amount. The electron transmission microscopy (TEM) reveals final particle sizes ranging between 7 and 26 nm depending on the presence or not of the dopant. The cathodoluminescence (CL) and photoluminescence (PL) studies of the doped and undoped nanoparticles show a luminescence signal attributed to surface oxygen vacancies (visible CL emission 380-700 nm and PL emission 350-800 nm); additionally, a decrease in emission intensity is observed due the inhibition of the recombination of the photogenerated electron-holes pairs; moreover, nanopowders were analyzed by UV-Vis spectrophotometry of diffuse reflectance, and the absorption edge of the Fe-TiO_2 in comparison to undoped TiO_2 is extended greatly toward the visible light. The six bands (A_1g + 2B_1g + 3E_g) found by Raman spectroscopy and the x-ray diffraction pattern (XRD) confirm that synthesized TiO_2 is only anatase phase, which is commonly used as a catalyst in waste water treatment, specifically in heterogeneous photocatalytic processes.


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©2019 Ricardo A. Solano et al.
The authors greatly acknowledge the financial support from University de Cartagena (International Internship 2017, 01735) and the Colombian Administrative Department of Science, Technology and Innovation (Colciencias Young Researchers Program 2017). The authors would also like to thank the Electronic Nanomaterials Physics Research group of Universidad Complutense de Madrid for providing the facility of all the equipment used in this research.

Uncontrolled Keywords:Doped Tio2 nanorods; Titanium-dioxide nanoparticles; Visible-light; Hydrothermal synthesis; Optical-properties; Leaf extract; Fe; Degradation; Photodegradation; Performance
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:57160
Deposited On:04 Oct 2019 14:46
Last Modified:07 Oct 2019 07:30

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