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Article

Rhodamine B Photodegradation in Aqueous Solutions Containing Nitrogen Doped TiO2 and Carbon Nanotubes Composites

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Laboratory of Optical Processes in Nanostructured Materials, National Institute of Materials Physics, Atomistilor Street 405A, POB MG 7, 077125 Bucharest, Romania
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Laboratory of Atomic Structures and Defects in Advanced Materials, National Institute of Materials Physics, Atomistilor Street 405A, POB MG 7, 077125 Bucharest, Romania
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Laboratory of Multifunctional Materials & Structures, National Institute of Materials Physics, Atomistilor Street 405A, POB MG 7, 077125 Bucharest, Romania
*
Authors to whom correspondence should be addressed.
Academic Editors: Marcello Brigante and Wanhong Ma
Molecules 2021, 26(23), 7237; https://doi.org/10.3390/molecules26237237
Received: 4 October 2021 / Revised: 15 November 2021 / Accepted: 24 November 2021 / Published: 29 November 2021
(This article belongs to the Special Issue Nanomaterials for Degradation of Organic Pollutants)
In this work, new results concerning the potential of mixtures based on nitrogen doped titanium dioxide (TiO2:N) and carbon nanotubes (CNTs) as possible catalyst candidates for the rhodamine B (RhB) UV photodegradation are reported. The RhB photodegradation was evaluated by UV–VIS absorption spectroscopy using samples of TiO2:N and CNTs of the type of single-walled carbon nanotubes (SWNTs), double-wall carbon nanotubes (DWNTs), multi-wall carbon nanotubes (MWNTs), and single-walled carbon nanotubes functionalized with carboxyl groups (SWNT-COOH) having various concentrations of CNTs. The best photocatalytic performance was obtained for sample containing TiO2:N and 2.5 wt.% SWNTs-COOH, when approx. 85% of dye removal was achieved after 300 min. of UV irradiation. The reaction kinetics of RhB aqueous solutions containing TiO2:N/CNT mixtures followed a complex first-order kinetic model. The TiO2:N/CNTs catalyst induced higher photodegradation efficiency of RhB than TiO2:N due to the presence of CNTs, which act as adsorbent and dispersing agent and capture the photogenerated electrons of TiO2:N hindering the electron–hole recombination. View Full-Text
Keywords: titanium dioxide; carbon nanotubes; UV–VIS spectroscopy; photocatalytic properties titanium dioxide; carbon nanotubes; UV–VIS spectroscopy; photocatalytic properties
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MDPI and ACS Style

Udrescu, A.; Florica, S.; Chivu, M.; Mercioniu, I.; Matei, E.; Baibarac, M. Rhodamine B Photodegradation in Aqueous Solutions Containing Nitrogen Doped TiO2 and Carbon Nanotubes Composites. Molecules 2021, 26, 7237. https://doi.org/10.3390/molecules26237237

AMA Style

Udrescu A, Florica S, Chivu M, Mercioniu I, Matei E, Baibarac M. Rhodamine B Photodegradation in Aqueous Solutions Containing Nitrogen Doped TiO2 and Carbon Nanotubes Composites. Molecules. 2021; 26(23):7237. https://doi.org/10.3390/molecules26237237

Chicago/Turabian Style

Udrescu, Adelina, Stefania Florica, Madalina Chivu, Ionel Mercioniu, Elena Matei, and Mihaela Baibarac. 2021. "Rhodamine B Photodegradation in Aqueous Solutions Containing Nitrogen Doped TiO2 and Carbon Nanotubes Composites" Molecules 26, no. 23: 7237. https://doi.org/10.3390/molecules26237237

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