Coumarin-based quantification of hydroxyl radicals and other reactive species generated on excited nitrogen-doped TiO2

Wafi, Abdul; Szabó-Bárdos, Erzsébet; Horváth, Ottó; Makó, Éva; Jakab, Miklós; Zsirka, Balázs

doi:10.1016/j.jphotochem.2020.112913

Cited by 38 publications

(33 citation statements)

References 48 publications

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“…1,4-hydroquinone (C 6 H 6 O 2 ) ≥99% was obtained from Sigma-Aldrich Kft. Compressed air was introduced (via bubbling) into the reaction mixtures from a gas bottle [ 22 ]. Freeze-dried bacteria (for Lumistox bacteria test) were provided by Hach Lange GmbH (Düsseldorf, Germany).…”

Section: Methodsmentioning

confidence: 99%

“…Co-precipitation method (NT-A): The catalyst was prepared by using ammonium hydroxide as nitrogen precursor and the synthesis procedure was adopted from our previous work [ 22 ]. Typically, 85 cm 3 of ammonium hydroxide solution (25%) was slowly added to 20 cm 3 of nitric acid solution (65%), and then 50 cm 3 of distilled water was also added to the transparent solution and stirred for 10 min.…”

Section: Methodsmentioning

confidence: 99%

“…Then, 0.36 g of NT-U or NT-A was added into these solutions, followed by 10-min stirring to reach the adsorption-desorption equilibrium. Subsequently, under continuous stirring, the mixture was irradiated by using a UV LED ( λ max = 389 nm [ 22 ]) for 10 min from a distance of 5 cm. [ 27 ].…”

Section: Methodsmentioning

confidence: 99%

“…Diffuse reflectance spectra (DRS) were recorded on a luminescence spectrometer (LS 50-B, PerkinElmer, Waltham, MA, USA) equipped with an integrating sphere attachment, and BaSO 4 was used as a reference standard. The band-gap energy was calculated using Tauc plot of square of the Kubelka–Munk function against photon energy [ 22 ].…”

Section: Methodsmentioning

confidence: 99%

“…In this work, N-TiO 2 catalysts with hollow and non-hollow structures were fabricated via different methods such as co-precipitation and sol–gel procedures [ 22 ]. Titanium isobutoxide–urea (NT-U, sol–gel) and titanium isopropoxide–ammonium hydroxide (NT-A, co-precipitation) were used as catalyst precursors.…”

Section: Introductionmentioning

confidence: 99%

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The Photocatalytic and Antibacterial Performance of Nitrogen-Doped TiO2: Surface-Structure Dependence and Silver-Deposition Effect

et al. 2020

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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.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Photocatalytic and Antibacterial Performance of Nitrogen-Doped TiO2: Surface-Structure Dependence and Silver-Deposition Effect

et al. 2020

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Preparation of Pd/PANI/ITO composite electrode and its degradation of tetracycline wastewater

Zhang

Jiang

Wang

et al. 2021

J of Applied Polymer Sci

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In order to treat antibiotics organic pollutants in the water environment, the Pd/PANI/ITO composite electrode was prepared by the galvanostatic electrodeposition method in this paper. The surface morphology and electrocatalytic activity of the electrode were analyzed and tested. Using the degradation rate of electrocatalytic tetracycline wastewater as an indicator, the optimal parameter conditions for preparing the composite electrode were screened out: the optimal deposition current of PANI was 2 mA, and the deposition time was 10 min. The optimal deposition current for Pd is 2 mA, and the deposition time is 10 min. The optimal current for the degradation of tetracycline wastewater is 10 mA, and the relationship between the degradation current and the degradation time conforms to the pseudo-first-order reaction kinetics. The existence of ÁOH in the degradation process of tetracycline was verified by the coumarin fluorescence detection technology. Finally, the degradation process of tetracycline wastewater is analyzed. The results show that the intermediate products produced during the degradation of tetracycline are gradually cleavage of tetracycline molecules, and they are eventually converted into CO 2 and H 2 O.

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Binary metal oxide nanocomposites of Fe, Co and Mn with SnO2 for photodegradation of dyes, catalytic reduction of 4-nitrophenol and antimicrobial activities

Babu

Antony

2022

Reac Kinet Mech Cat

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Coumarin-based quantification of hydroxyl radicals and other reactive species generated on excited nitrogen-doped TiO2

Cited by 38 publications

References 48 publications

The Photocatalytic and Antibacterial Performance of Nitrogen-Doped TiO2: Surface-Structure Dependence and Silver-Deposition Effect

The Photocatalytic and Antibacterial Performance of Nitrogen-Doped TiO2: Surface-Structure Dependence and Silver-Deposition Effect

Preparation of Pd/PANI/ITO composite electrode and its degradation of tetracycline wastewater

Binary metal oxide nanocomposites of Fe, Co and Mn with SnO2 for photodegradation of dyes, catalytic reduction of 4-nitrophenol and antimicrobial activities

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