Photoelectrocatalytic oxidation of phenol on TiO2 nanotubes under oxygen pressure

Orudzhev, Farid; Aliev, Z. M.; Gasanova, F. G.; Исаев, А. Б.; Shabanov, N. S.

doi:10.1134/s1023193515110130

Cited by 14 publications

(10 citation statements)

References 45 publications

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“…The photocatalyst load was fixed as 1 g L –1 and the suspension was continuously stirred with a magnet and with an oxygen flow as purge. The oxygen was allowed to saturate the photocatalyst suspension in order to obtain a high dissolved oxygen concentration in the reaction media, since it has an influence on the photocatalytic activity [ 39 ]. The irradiation was performed using a 10 W high-intensity UV-LED (15.5 × 23 mm) with a maximum irradiance wavelength at 385 nm.…”

Section: Methodsmentioning

confidence: 99%

One-Pot Thermal Synthesis of g-C3N4/ZnO Composites for the Degradation of 5-Fluoruracil Cytostatic Drug under UV-LED Irradiation

et al. 2022

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Graphitic carbon nitride (g-C3N4) was used to enhance the photocatalytic activity of ZnO nanoparticles for the degradation of 5-fluorouracil (5-FU) cytostatic drug under UV-LED irradiation. CN/ZnO composites were synthetized by an easy one-pot thermal method, varying the g-C3N4 loading, i.e., from 10 to 67 wt% and a post-thermal exfoliation in air. The physicochemical and optical properties of the materials were analyzed by several techniques. CN/ZnO composites showed a coral-like structure of spherical ZnO wurtzite particles on the g-C3N4 structure. In general, the synergism and heterojunction interface between both phases allowed the enhancement of the mesoporosity, light absorption ability, and the aromaticity of the corresponding composites. Moreover, the photocatalytic activity of the CN/ZnO composites was increased with the addition of g-C3N4 in comparison with pristine ZnO. The highest activity was found for the composite containing 25 wt% of g-C3N4 (i.e., CN25/ZnO), reaching the total degradation of 5-FU and a mineralization of 48% at 180 min, as well as a good photostability during four reuse cycles. Experiments with different pH solutions and scavengers allowed for the assessment of the reactive oxygen species (ROS) involved in the 5-FU degradation pathway, with radicals and non-radical species as the main responsible active species. Furthermore, a tentative photocatalytic mechanism was proposed for CN/ZnO composites.

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Section: Methodsmentioning

confidence: 99%

One-Pot Thermal Synthesis of g-C3N4/ZnO Composites for the Degradation of 5-Fluoruracil Cytostatic Drug under UV-LED Irradiation

et al. 2022

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“…The film was grown in an ALDCERAM ML-200 (ALDCERAM, LLC, Boulder, CO, USA) atomic layer deposition reactor. The substrate used was TiO 2 Nt on Ti foil, prepared as described in the work [13]. The details of the synthesis procedure were described by us in our previous work [14,15], where the Bi-Fe-O phase was synthesized on the surface of highly oriented pyrolytic graphite (HOPG).…”

Section: Synthesis Proceduresmentioning

confidence: 99%

Atomic Layer Deposition of Mixed-Layered Aurivillius Phase on TiO2 Nanotubes: Synthesis, Characterization and Photoelectrocatalytic Properties

et al. 2020

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For the first time, one-dimensional phase-modulated structures consisting of two different layered Aurivillius phases with alternating five and six perovskite-like layers were obtained by atomic layer deposition (ALD) on the surface of TiO2 nanotubes (Nt). It was shown that the use of vertically oriented TiO2 Nt as the substrate and the ALD technology of a two-layer Bi2O3-FeOx sandwich-structure make it possible to obtain a layered structure due to self-organization during annealing. A detailed study by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed that the coating is conformal. Raman spectroscopic analysis indicated the structure of the layered Aurivillius phases. Transient photocurrent responses under Ultraviolet–Visible (UV-Vis) light irradiation show that the ALD coating benefits the efficiency of photon excitation of electrons. The results of the photoelectrocatalytic experiments (PEC) with methyl orange degradation as a model demonstrate the significant potential of the synthesized structure as a photocatalyst. Photoluminescent measurement showed a decrease in the probability of recombination of photogenerated electron–hole pairs for ALD-coated TiO2 Nt, which demonstrates the high potential of these structures for use in photocatalytic and photoelectrochemical applications.

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“…The photocatalytic activities of prepared TiO 2 nanotubes were determined by studying the degradation of an aqueous solution of phenol in a teflon cylindrical vessel photocatalytic reactor with volume 200 ml described in more detail in our previous work [30,31]. The oxygen pressure created by feeding from a high pressure cylinder to the cell.…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Effect of TiO2 Nanotube Calcination Temperature and Oxygen Pressure to Photocatalytic Oxidation of Phenol

Исаев

Shabanov

Orudzhev

2018

Materials Research Foundations

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The influences of oxygen pressure and TiO 2 nanotubes calcination temperature on the photocatalytic degradation phenol were investigated. According to experimental results the dissolved oxygen at different pressure and TiO 2 calcination temperature was a determining parameter for the photocatalytic degradation of phenol. The calcination temperature of TiO 2 nanotubes affects the anatase phase, crystallite size, surface area and pore volume of TiO 2 powder and respectively to rate of photodegradation of phenol. The kinetics of photocatalytic degradation of phenol in presence of TiO 2 nanotubes at high pressure of oxygen is investigated. The initial rate of photodegradation phenol were increased from 0.21 to 0.52 mg•l -1 •min -1 when the initial oxygen pressure was increased from 0.1 to 0.6 MPa and have linear relationship between phenol oxidation rate and the oxygen pressure. The dissolved oxygen acted as an electron scavenger with formation reactive oxygen species such as the superoxide ion and the hydroxyl radical.

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Photoelectrocatalytic oxidation of phenol on TiO2 nanotubes under oxygen pressure

Cited by 14 publications

References 45 publications

One-Pot Thermal Synthesis of g-C3N4/ZnO Composites for the Degradation of 5-Fluoruracil Cytostatic Drug under UV-LED Irradiation

One-Pot Thermal Synthesis of g-C3N4/ZnO Composites for the Degradation of 5-Fluoruracil Cytostatic Drug under UV-LED Irradiation

Atomic Layer Deposition of Mixed-Layered Aurivillius Phase on TiO2 Nanotubes: Synthesis, Characterization and Photoelectrocatalytic Properties

Effect of TiO2 Nanotube Calcination Temperature and Oxygen Pressure to Photocatalytic Oxidation of Phenol

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