The Photocatalytic and antibacterial performance of Nitrogen-Doped TiO2: Surface-structure dependence and Silver-deposition effect

Wafi, Abdul and Szabó-Bárdos, Erzsébet and Horváth, Ottó and Pósfai, Mihály and Makó, Éva and Juzsakova, Tatjána and Fónagy, Orsolya (2020) The Photocatalytic and antibacterial performance of Nitrogen-Doped TiO2: Surface-structure dependence and Silver-deposition effect. Nanomaterials, 10 (11). p. 2261. ISSN 2079-4991

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Abstract

Catalysts for visible-light-driven oxidative cleaning processes and antibacterial applications (also in the dark) were developed. In order to extend the photoactivity of titanium dioxide into the visible region, nitrogen-doped TiO2 catalysts with hollow and non-hollow structures were synthesized by co-precipitation (NT-A) and sol–gel (NT-U) methods, respectively. To increase their photocatalytic and antibacterial efficiencies, various amounts of silver were successfully loaded on the surfaces of these catalysts by using a facile photo-deposition technique. Their physical and chemical properties were evaluated by using scanning electron microscopy (SEM), transmission electron microscopy–energy dispersive X-ray spectroscopy (TEM–EDS), Brunauer–Emmett–Teller (BET) surface area, X-ray diffraction (XRD), and diffuse reflectance spectra (DRS). The photocatalytic performances of the synthesized catalysts were examined in coumarin and 1,4-hydroquinone solutions. The results showed that the hollow structure of NT-A played an important role in obtaining high specific surface area and appreciable photoactivity. In addition, Ag-loading on the surface of non-hollow structured NT-U could double the photocatalytic performance with an optimum Ag concentration of 10−6 mol g−1, while a slight but monotonous decrease was caused in this respect for the hollow surface of NTA upon increasing Ag concentration. Comparing the catalysts with different structures regarding the photocatalytic performance, silverized non-hollow NT-U proved competitive with the hollow NT-A catalyst without Ag-loading for efficient visible-light-driven photocatalytic oxidative degradations. The former one, due to the silver nanoparticles on the catalyst surface, displayed an appreciable antibacterial activity, which was comparable to that of a reference material practically applied for disinfection in polymer coatings.

Item Type: Journal Article
Keywords: silver/nitrogen co-doped TiO2; visible-light-driven photocatalysis; hollow structure; coumarin; hydroquinone; disinfection
Subjects: 03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030203 Inorganic Green Chemistry
09 ENGINEERING > 0904 Chemical Engineering > 090402 Catalytic Process Engineering
09 ENGINEERING > 0904 Chemical Engineering > 090409 Wastewater Treatment Processes
09 ENGINEERING > 0904 Chemical Engineering > 090410 Water Treatment Processes
Divisions: Faculty of Medical and Health Sciences > Department of Pharmacy
Depositing User: Abdul Wafi
Date Deposited: 23 Nov 2020 13:38

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