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Novel, Simple and Low-Cost Preparation of Ba-Modified TiO2 Nanotubes for Diclofenac Degradation under UV/Vis Radiation

Bohač, Mario; Čižmar, Tihana; Kojić, Vedran; Marčec, Jan; Juraić, Krunoslav; Grčić, Ivana; Gajović, Andreja (2021) Novel, Simple and Low-Cost Preparation of Ba-Modified TiO2 Nanotubes for Diclofenac Degradation under UV/Vis Radiation. Nanomaterials, 11 (10). ISSN 2079-4991

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Abstract

A novel low-cost synthesis of barium-modified TiO2 nanotube (TNT) arrays was used to obtain an immobilized photocatalyst for degradation of diclofenac. TNT arrays were prepared by electrochemical anodization of titanium thin films deposited on fluorine-doped tin oxide (FTO) coated glass by magnetron sputtering, ensuring transparency and immobilization of the nanotubes. The Ba-modifications were obtained by annealing solutions of Ba(OH)2 spin coated on top of TNT. Three different concentrations of Ba(OH)2 were used (12.5 mM, 25 mM and 50 mM). The crystalline structure, morphology and presence of Ba were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy, respectively. Ba-modified TiO2 nanotubes (BTNT) were tested for photocatalytic degradation of diclofenac under UV/Vis radiation and it was proven that all of the Ba-modified samples showed an increase in photocatalytic activity with respect to the unmodified TNTs. The most efficient photocatalyst was the sample prepared with 25 mM Ba(OH)2 which showed 90% diclofenac degradation after 60 min. This result was in agreement with cyclic voltammetry measurements that showed the largest increase in photo-oxidation current densities for the same sample due to the increased generation of •OH radicals obtained by a more efficient photogenerated charge separation.

Item Type: Article
Uncontrolled Keywords: Ba-modification ; transparent TiO2 nanotubes ; thin film ; photocatalysis ; diclofenac
Subjects: NATURAL SCIENCES > Physics
NATURAL SCIENCES > Chemistry
TECHNICAL SCIENCES > Chemical Engineering
Divisions: Division of Materials Physics
Projects:
Project titleProject leaderProject codeProject type
Nanokompoziti s perovskitima za fotovoltaike, fotokatalizu i senzorikuGajović, AndrejaIP-2018-01-5246HRZZ
Potpora vrhunskim istraživanjima Centra izvrsnosti za napredne materijale i senzoreIvanda, Mile; Jakšić, Milko; Stipčević, Mario; Kralj, MarkoKK.01.1.1.01.0001EK
Otpad i Sunce u službi fotokatalitičke razgradnje mikroonečišćivala u vodama (OS-Mi)Grčić, Ivana; Vrsaljko, Domagoj; Gajović, Andreja; Brnardić, IvanKK.01.1.1.04.0006MZO
Depositing User: Sofija Konjević
Date Deposited: 12 Nov 2021 10:13
Last Modified: 12 Nov 2021 10:14
URI: http://fulir.irb.hr/id/eprint/6637
DOI: 10.3390/nano11102714

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