Photocatalytic decomposition of Rhodamine B on uranium-doped mesoporous titanium dioxide

Liu, Yi; Becker, Blake; Burdine, Brandon; Sigmon, Ginger E.; Burns, Peter C.

doi:10.1039/c7ra01385j

Cited by 14 publications

(8 citation statements)

References 57 publications

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“…Nowadays, advanced photocatalysis semiconductors have received extensive attention in the environmental fields because of their huge potential, for example in the removal of organic pollutants, and to deodorize and purify polluted air and water as well as used for solar water splitting [ 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 ]. Among many studied photocatalysis semiconductors, mesoporous TiO 2 is a one of the most preferable materials because of its continuous particle framework, high quantum efficiency, high surface area, nanocrystallinity, long-term stability and non-toxicity.…”

Section: Applicationmentioning

confidence: 99%

Mesoporous Titanium Dioxide: Synthesis and Applications in Photocatalysis, Energy and Biology

Niu

Wang

et al. 2018

Materials

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Mesoporous materials are materials with high surface area and intrinsic porosity, and therefore have attracted great research interest due to these unique structures. Mesoporous titanium dioxide (TiO2) is one of the most widely studied mesoporous materials given its special characters and enormous applications. In this article, we highlight the significant work on mesoporous TiO2 including syntheses and applications, particularly in the field of photocatalysis, energy and biology. Different synthesis methods of mesoporous TiO2—including sol–gel, hydrothermal, solvothermal method, and other template methods—are covered and compared. The applications in photocatalysis, new energy batteries and in biological fields are demonstrated. New research directions and significant challenges of mesoporous TiO2 are also discussed.

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Section: Applicationmentioning

confidence: 99%

Mesoporous Titanium Dioxide: Synthesis and Applications in Photocatalysis, Energy and Biology

Niu

Wang

et al. 2018

Materials

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“…A ctinide-based functional materials have been substantially underexplored; however, participation of the unique 5f electrons in bond formation could lead to new materials with unconventional chemical, electronic, and magnetic properties. For instance, uranium has been utilized as an exceptional catalyst for water reduction, 1 photodegradation of organic dyes, 2 oxidative combustion of volatile organic compounds, 3 and activation of small molecules such as N 2 , 4,5 CO, 6 CO 2 , 7 etc. 8,9 Photoexcitation of the uranyl ion ([U VI O 2 ] 2+ ), the most prevalent chemical form of uranium in nature, produces a strongly oxidizing excited-state species [U VI O 2 ] 2+ * with a standard reduction potential of +2.6 V (vs standard hydrogen electrode).…”

mentioning

confidence: 99%

mentioning

confidence: 99%

“…Synthetic strategies for the stabilization of pentavalent uranyl species in homogeneous systems have focused on creating steric hindrance around uranyl ions by using bulky ligands to prohibit the formation of dimeric cation–cation complexes. Unfortunately, these complexes are susceptible to disproportionation in the presence of protons. , While doping and grafting of uranyl ions on solid supports such as TiO 2 , alumina, and mesoporous silica are feasible strategies for the immobilization of uranyl species for heterogeneous catalysis, ,, their development has largely been hindered by the lack of precise structural information.…”

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confidence: 99%

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Stabilization of Photocatalytically Active Uranyl Species in a Uranyl–Organic Framework for Heterogeneous Alkane Fluorination Driven by Visible Light

et al. 2020

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When photoactivated, the uranyl ion is a powerful oxidant capable of abstracting hydrogen atoms from nonactivated C−H bonds. However, the highly reactive singly reduced [U V O 2 ] + intermediate is unstable with respect to disproportionation to the uranyl dication and insoluble tetravalent uranium phases, which limits the usage of uranyl ions as robust photocatalysts. Herein, we demonstrate that photoactivated uranyl ions can be stabilized by immobilizing and separating them spatially in a uranyl−organic framework heterogeneous catalyst, NU-1301. The visible-light-photoactivated uranyl ions in NU-1301 exhibited longer-lived U(V) and radicals than those in homogeneous counterparts, as evidenced by X-ray photoelectron spectroscopy and time-dependent electron paramagnetic resonance, leading to higher turnovers and enhanced stability for the fluorination of nonactivated alkanes.

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“…The peaks at 150 cm -1 (E g ), 397 cm -1 (B 1g ), 514 cm -1 (B 1g + A 1g ), and 638 cm -1 (E g ), that are specific for anatase, are observed for pristine and modified TiO 2 samples. As shown in literature [51], the Raman peak at 150 cm -1 is extremely sensitive to the impurities of uranium into the crystal lattice of anatase because these impurities change the shape of the peak and position of its maximum. In our case, the shape and position are similar which indicates the absence of new impurities in the crystal lattice after modification.…”

Section: Synthesis and Characterization Datamentioning

confidence: 76%

Synthesis, Characterization and Visible-Light Photocatalytic Activity of Solid and TiO2-Supported Uranium Oxycompounds

et al. 2021

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In this study, various solid uranium oxycompounds and TiO2-supported materials based on nanocrystalline anatase TiO2 are synthesized using uranyl nitrate hexahydrate as a precursor. All uranium-contained samples are characterized using N2 adsorption, XRD, UV–vis, Raman, TEM, XPS and tested in the oxidation of a volatile organic compound under visible light of the blue region to find correlations between their physicochemical characteristics and photocatalytic activity. Both uranium oxycompounds and TiO2-supported materials are photocatalytically active and are able to completely oxidize gaseous organic compounds under visible light. If compared to the commercial visible-light TiO2 KRONOS® vlp 7000 photocatalyst used as a benchmark, solid uranium oxycompounds exhibit lower or comparable photocatalytic activity under blue light. At the same time, uranium compounds contained uranyl ion with a uranium charge state of 6+, exhibiting much higher activity than other compounds with a lower charge state of uranium. Immobilization of uranyl ions on the surface of nanocrystalline anatase TiO2 allows for substantial increase in visible-light activity. The photonic efficiency of reaction over uranyl-grafted TiO2, 12.2%, is 17 times higher than the efficiency for commercial vlp 7000 photocatalyst. Uranyl-grafted TiO2 has the potential as a visible-light photocatalyst for special areas of application where there is no strict control for use of uranium compounds (e.g., in spaceships or submarines).

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Photocatalytic decomposition of Rhodamine B on uranium-doped mesoporous titanium dioxide

Abstract: Mesoporous uranium-doped TiO2 anatase materials were studied to determine the influence of U-doping on the photocatalytic properties for Rhodamine B (RhB) degradation.

Cited by 14 publications

References 57 publications

Mesoporous Titanium Dioxide: Synthesis and Applications in Photocatalysis, Energy and Biology

Mesoporous Titanium Dioxide: Synthesis and Applications in Photocatalysis, Energy and Biology

Stabilization of Photocatalytically Active Uranyl Species in a Uranyl–Organic Framework for Heterogeneous Alkane Fluorination Driven by Visible Light

Synthesis, Characterization and Visible-Light Photocatalytic Activity of Solid and TiO2-Supported Uranium Oxycompounds

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