Titanium Dioxide Photocatalysis

Santo, Vladimiro Dal; Naldoni, Alberto

doi:10.3390/catal8120591

Cited by 29 publications

(15 citation statements)

References 18 publications

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“…Thus, firstly, (Z)-4-((5-hydroxypentylimino) methyl)-2-methoxyphenol (HPI-MP) (3) was obtained from the combination of substances (1) and (2). Subsequently, SiPc (5) was obtained from the addition of substances (3) and (4).…”

Section: B/naf-tio 2 -Sipc Photocatalystmentioning

confidence: 99%

“…Heterogeneous photocatalysis, in particular, by exploiting the use of titanium dioxide, allowed degrading completely different classes of pollutants, but TiO 2 activity could be further enhanced by adopting various strategies, such as metal and non-metal doping and anchorage with other narrower band gap semiconductors [3][4][5][6]. B-doped TiO 2 nano-powders obtained via sol-gel synthesis has been reported to be able to efficiently abate Methylene Blue (MB) thanks to an excellent combination of physico-chemical properties, including low band-gap energy, relatively high specific surface area, suitable surface morphology, and suitable surface charge [3].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of B/NaF and Silicon Phthalocyanine-Modified TiO2 and an Evaluation of Their Photocatalytic Removal of Carbamazepine

et al. 2020

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This study investigated the synthesis of two different types of photocatalysts, namely, boron/sodium fluoride co-doped titanium dioxide (B/NaF-TiO2), and its analogue, a dye-sensitized form of silicon-based axial methoxy substituted phthalocyanine (B/NaF-TiO2SiPc). Structural and morphological characterizations were performed via X-ray diffraction (XRD); Fourier transform infra-red (FTIR); N2 adsorption–desorption at 77 K by Brunauer–Emmett–Teller (BET) and Barrett, Joyner, and Halenda (BJH) methods; transmission electron microscopy (TEM); X-ray photoelectron spectroscopy (XPS); and UV–visible absorption spectroscopy. The estimated crystallite size of pure TiO2 and pure B/NaF-TiO2 was 24 nm, and that of B/NaF-TiO2SiPc was 29 nm, whereas particle sizes determined by TEM were 25, 28, and 31 nm for pure TiO2, B/NaF-TiO2 and B/NaF-TiO2SiPc respectively. No significant differences between B/NaF-TiO2 and B/NaF-TiO2SiPc were observed for surface area by (BET) analysis (13 m2/g) or total pore volume by the BJH application model (0.05 cm3/g). Energy band gap values obtained for B/NaF-TiO2 and B/NaF-TiO2SiPc were 3.10 and 2.90 eV respectively, lower than pure TiO2 (3.17 eV). The photocatalytic activity of the synthesized materials was tested using carbamazepine (CBZ) as the model substrate. Carbamazepine removal after 4 h of irradiation was almost 100% for B/NaF-TiO2 and 70% for B/NaF-TiO2SiPc; however, the substrate mineralization proceeded slower, suggesting the presence of organic intermediates after the complete disappearance of the pollutant.

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Section: B/naf-tio 2 -Sipc Photocatalystmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of B/NaF and Silicon Phthalocyanine-Modified TiO2 and an Evaluation of Their Photocatalytic Removal of Carbamazepine

et al. 2020

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“…Oxide semiconductor nanomaterials are gaining increasing interest due to their attractive functional properties related to their small particle size and hence large active surface (Dal Santo et al 2018;Sowik et al 2019). Among these features, the photocatalytic properties are of particular interest.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic properties of zirconium oxide–zinc oxide nanoparticles synthesised using microwave irradiation

2019

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ZrO 2-ZnO nanoparticles with different mass concentrations of ZrO 2 (1%, 5%, 10%, 20%) were prepared using a two-stage precipitation method with microwave irradiation. The ZrO 2-ZnO with 10% of ZrO 2 had the highest photocatalytic activity. The obtained material was characterised using XRD, which confirmed a high crystal structure in the synthesised material, and transmission electron microscopy (TEM) analysis, which depicted that micro and nano needle-shaped particles had been obtained and that irregularly shaped nanoparticles were present on the surface of those particles. TEM-EDX analysis confirmed the presence of both ZnO and ZrO 2 in the product. FT-IR analyses showed that the positions of peaks related to Zn-O and Zr-O absorption bands did not change in ZrO 2-ZnO NPs. The initial concentration of Methylene Blue (MB), the pH of the solution, and the mass of the photocatalyst were investigated to determine the photocatalytic efficiency of the material and the degree of removal of the MB. The highest efficiency (97%) was obtained in the following conditions: 30 mg/ dm 3 of the MB solution, pH 9 and 70 mg ZrO 2-ZnO after 30 min of reaction time under UV irradiation.

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“…Environmental cleanup applications of TiO 2 -based heterogenous photocatalysis have been the most actively reported for the abatement of organic pollutants in air and wastewaters [7,8]. The many trade-offs of efficient photoactivity, high stability, low cost, and environmental friendliness of TiO 2 in comparison to many other semiconductor candidates for photocatalytic applications make it to stand out for industrial use [9].…”

Section: Introductionmentioning

confidence: 99%

“…Despite the numerous advantages of TiO 2 , its inability to achieve absorption in visible or even near visible wavelengths, rather large band gap, low quantum yield etc., have been some of its major practical drawbacks [9]. In order to address such drawbacks, strategies like doping, self-doping, 2D materials, quantum dots, metal co-catalyst deposition, composite realization with plasmonic materials, other semiconductors, graphene, surface dye sensitization etc., have been adopted [5,15].…”

Section: Introductionmentioning

confidence: 99%

Immobilized TiO2/ZnO Sensitized Copper (II) Phthalocyanine Heterostructure for the Degradation of Ibuprofen under UV Irradiation

et al. 2021

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Photocatalytic coatings of TiO2/ZnO/CuPc were developed on stainless steel substrates by subsequent sol gel dip coating for TiO2, spray pyrolysis for ZnO, and spin coating for copper (ii) phthalocyanine (CuPc) deposition. The latter compound was successfully prepared using a Schiff-based process. The materials and coatings developed were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy with attached energy dispersive spectroscopy (SEM-EDS), UV-Vis spectroscopy, room temperature photoluminescence (RTPL) spectroscopy, H1-nuclear magnetic resonance (1H-NMR) spectroscopy, C13-nuclear magnetic resonance (13C-NMR) spectroscopy, and matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF) mass spectrometry (MS). The as-deposited TiO2/ZnO/CuPc on stainless steel retained in pristine state the structural and morphological/spectroscopic characteristics of its respective components. Estimated energy band gap values were 3.22 eV, 3.19 eV, 3.19 eV for TiO2, ZnO, TiO2/ZnO respectively and 1.60 eV, 2.44 eV, and 2.92 eV for CuPc. The photocatalytic efficiency of the fabricated TiO2/ZnO/CuPc coatings was tested toward ibuprofen (IBF). After 4 h irradiation under 365 nm UV, an increased degradation of about 80% was achieved over an initial 5 mg/L ibuprofen (IBF). This was much higher compared to about 42% and 18% IBF degradation by TiO2/ZnO and TiO2 thin film, respectively. In all cases, the stability of the best-performing photocatalyst was investigated showing a small decline to 77% of IBF degradation after the 5th cycle run. The effect of pH, reactive oxygen species (ROS) probe, shed light on a possible catalytic mechanism that was suggested.

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Titanium Dioxide Photocatalysis

Abstract: Dating from the seminal work of Fujishima et al. [...]

Cited by 29 publications

References 18 publications

Synthesis and Characterization of B/NaF and Silicon Phthalocyanine-Modified TiO2 and an Evaluation of Their Photocatalytic Removal of Carbamazepine

Synthesis and Characterization of B/NaF and Silicon Phthalocyanine-Modified TiO2 and an Evaluation of Their Photocatalytic Removal of Carbamazepine

Photocatalytic properties of zirconium oxide–zinc oxide nanoparticles synthesised using microwave irradiation

Immobilized TiO2/ZnO Sensitized Copper (II) Phthalocyanine Heterostructure for the Degradation of Ibuprofen under UV Irradiation

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