Reactive oxygen species generation in aqueous solutions containing GdVO4:Eu3+ nanoparticles and their complexes with methylene blue

Hubenko, Kateryna; Yefimova, Svetlana; Tkacheva, T. N.; Maksimchuk, Pavel; Borovoy, I. A.; Klochkov, Vladimir K.; Kavok, Nataliya; Opolonin, Oleksandr D.; Malyukin, Yu. V.

doi:10.1186/s11671-018-2514-5

Cited by 31 publications

(28 citation statements)

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“…The generated electron in the conduction band may move without restriction to the aggregated molecules; consequently, the generated e − / h + pairs are effectively separated and their recombination energy is remarkably minimized. Active species, such as hydroxy radical (OH), generated by the reaction between photo-generated holes with H 2 O or OH − oxidize the MB molecules to degraded products on the surface of nanofibers [ 55 , 56 ]. We have examined the photodegradation of MB in the presence of coumarin as a radical scavenger.…”

Section: Resultsmentioning

confidence: 99%

Supramolecular Porphyrin Nanostructures Based on Coordination-Driven Self-Assembly and Their Visible Light Catalytic Degradation of Methylene Blue Dye

Shee

Kim

2020

Nanomaterials

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A series of porphyrin triads (1–4), in which each triad is composed of a Sn(IV) porphyrin and two free-base (or Zn(II)) porphyrins, was synthesized and their self-assembled nanostructures were studied. Depending on the substituent on porphyrin moieties, each triad was self-assembled into a different nanostructure. In particular, the cooperative coordination of 3-pyridyl groups in the Sn(IV) porphyrin with the axial Zn(II) porphyrins in triad 4 leads to forming uniform nanofibers with an average width of 10–22 nm. Other triads without the coordinating interaction between the central Sn(IV) porphyrin and the axial porphyrins formed irregularly shaped aggregates in contrast. The morphologies of nanofiber changed drastically upon the addition of pyrrolidine, in which pyrrolidine molecules break down the self-assembly process by coordinating with the axial Zn(II) porphyrins. All porphyrin aggregates exhibited efficient photocatalytic performances on the degradation of methylene blue dye under visible light irradiation. The degradation efficiencies after 2 h were observed to be between 70% and 95% for the aggregates derived from the four triads.

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Section: Resultsmentioning

confidence: 99%

Supramolecular Porphyrin Nanostructures Based on Coordination-Driven Self-Assembly and Their Visible Light Catalytic Degradation of Methylene Blue Dye

Shee

Kim

2020

Nanomaterials

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“…In the presence of coumarin, the degradation efficiency of RhB drastically decreased. This suggests that a portion of the hydroxyl radicals was removed by coumarin to form 7-hydroxycoumarin, and the rest reacted with RhB until decomposition [47]. Similarly, for the detection of the superoxide radical anion, we used hydroethidine as a fluorescent probe.…”

Section: Photocatalysis For the Degradation Of Rhodamine B (Rhb) Dyementioning

confidence: 99%

Self-Assembled Nanomaterials Based on Complementary Sn(IV) and Zn(II)-Porphyrins, and Their Photocatalytic Degradation for Rhodamine B Dye

Shee

Kim

2021

Molecules

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A series of porphyrin triads (1–6), based on the reaction of trans-dihydroxo-[5,15-bis(3-pyridyl)-10,20-bis(phenyl)porphyrinato]tin(IV) (SnP) with six different phenoxy Zn(II)-porphyrins (ZnLn), was synthesized. The cooperative metal–ligand coordination of 3-pyridyl nitrogens in the SnP with the phenoxy Zn(II)-porphyrins, followed by the self-assembly process, leads to the formation of nanostructures. The red-shifts and remarkable broadening of the absorption bands in the UV–vis spectra for the triads in CHCl3 indicate that nanoaggregates may be produced in the self-assembly process of these triads. The emission intensities of the triads were also significantly reduced due to the aggregation. Microscopic analyses of the nanostructures of the triads reveal differences due to the different substituents on the axial Zn(II)-porphyrin moieties. All these nanomaterials exhibited efficient photocatalytic performances in the degradation of rhodamine B (RhB) dye under visible light irradiation, and the degradation efficiencies of RhB in aqueous solution were observed to be 72~95% within 4 h. In addition, the efficiency of the catalyst was not impaired, showing excellent recyclability even after being applied for the degradation of RhB in up to five cycles.

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“…Then, if molecular oxygen (O2) is present, the HO⸱ radical interacts with O2, to form HOOO⸱, which is converted to HO⸱ and 1 O2 see Figure 16. Dissolved O2 and HO⸱ were also present in our samples during irradiation with X-rays 92 . More specifically, upon irradiation with X-rays, water molecules were ionized, to generate several radicals, including the extremely reactive HO⸱ 92 .…”

Section: Figure 9d Depicts the Overlap Between The Anthracene Excitation Spectrum And The Agnp Andmentioning

confidence: 59%

“…Dissolved O2 and HO⸱ were also present in our samples during irradiation with X-rays 92 . More specifically, upon irradiation with X-rays, water molecules were ionized, to generate several radicals, including the extremely reactive HO⸱ 92 . The resulting HO⸱ interacted with O2, to afford 1 O2 in a mechanism resembling the mechanism proposed in Figure 10.…”

Section: Figure 9d Depicts the Overlap Between The Anthracene Excitation Spectrum And The Agnp Andmentioning

confidence: 59%

“…Furthermore, according to the literature, if dissolved O2 is present in water during irradiation with X-rays, O2 reduction produces superoxide radicals, which are precursors of 1 O2 and other ROS. 92 Therefore, we attributed the ESR signal of the control samples irradiated with X-rays to TPC oxidation by 1 O2 generated as a sub-product of water radiolysis in the presence of dissolved O2. Figure 16 -Schematic illustration of 1O2 generation in sonicated water/water irradiated with X-rays in the presence of dissolved molecular oxygen.…”

Section: Figure 9d Depicts the Overlap Between The Anthracene Excitation Spectrum And The Agnp Andmentioning

confidence: 99%

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Multitherapeutic nanoplatform based on Scintillating Anthracene, Silver@Antracene, and Gold@Anthracene nanoparticles for combined radiation and photodynamic therapies: enhancing radiation dose while generating, trapping, probing, or delivering singlet oxygen species

Oliveira¹

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We have synthesized anthracene and metal@anthracene core-shell nanoparticles and propose that they be used as a nanoplatform that combines radiation and photodynamic therapies. Synthesis of anthracene nanoparticles in the presence of colloidal silver or gold reduced the hydrodynamic radius in a concentration-dependent manner and caused core-shell nanostructures to grow, as revealed by AFM and DLS. Besides reduced size, the core-shell nanoparticles presented enhanced fluorescence emission.Fluorescence enhancements were higher for Ag@anthracene nanoparticles and for wavelengths approaching the plasmon resonance peak, which suggested a plasmon-enhancement phenomenon. The size-dependent enhancement in fluorescence associated with the distance between the metal core and the surface area of the nanoparticles provided an optimal core-shell diameter of 100-150 nm. We investigated singlet oxygen ( 1 O2) generation by electron spin resonance spectroscopy (ESR) with a spintrap and by fluorescence spectroscopy. The ESR/spin-trap results revealed that, in the presence of a porphyrin, anthracene nanoparticles and the core-shell nanoparticles acted as energy mediators for 1 O2 generation under exposure to light. Fluorescence suppression experiments showed that the core-shell nanoparticles captured 1 O2 at higher rates because they presented smaller size and larger surface area than anthracene nanoparticles. Together, the ESR and fluorescence results suggested that overall production of 1 O2 ( 1 O2 captured by spin-trap + 1 O2 captured by surface anthracene molecules) was higher for the core-shell nanoparticles than for anthracene nanoparticles. Moreover, because of plasmon-enhanced fluorescence and larger surface area, the Ag@anthracene nanoparticles stood out as a new and more sensitive fluorescent probe for 1 O2. During irradiation with X-rays, both anthracene and Ag@anthracene nanoparticles trapped 1 O2; subsequently, they afforded sustained release of the trapped 1 O2 for up 12 days after irradiation. This could be an interesting strategy to extend the radiation therapy treatment after the irradiation sessions. Furthermore, the presence of the metallic nanoparticle in the core of the core-shell nanostructure increased interaction with X-rays, raising the radiation dose around xii the nanoparticle. Therefore, metal@anthracene nanostructures may allow cancer treatment by different approaches depending on nanoparticle configuration.

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Reactive oxygen species generation in aqueous solutions containing GdVO4:Eu3+ nanoparticles and their complexes with methylene blue

Cited by 31 publications

References 50 publications

Supramolecular Porphyrin Nanostructures Based on Coordination-Driven Self-Assembly and Their Visible Light Catalytic Degradation of Methylene Blue Dye

Supramolecular Porphyrin Nanostructures Based on Coordination-Driven Self-Assembly and Their Visible Light Catalytic Degradation of Methylene Blue Dye

Self-Assembled Nanomaterials Based on Complementary Sn(IV) and Zn(II)-Porphyrins, and Their Photocatalytic Degradation for Rhodamine B Dye

Multitherapeutic nanoplatform based on Scintillating Anthracene, Silver@Antracene, and Gold@Anthracene nanoparticles for combined radiation and photodynamic therapies: enhancing radiation dose while generating, trapping, probing, or delivering singlet oxygen species

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